Airworthiness Directives; Bombardier, Inc., Airplanes

[Federal Register Volume 91, Number 133 (Tuesday, July 14, 2026)]
[Rules and Regulations]
[Pages 43025-43032]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2026-14110]



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                                                Federal Register
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Federal Register / Vol. 91, No. 133 / Tuesday, July 14, 2026 / Rules 
and Regulations

[[Page 43025]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2025-3435; Project Identifier MCAI-2025-01602-T; 
Amendment 39-23410; AD 2026-14-09]
RIN 2120-AA64


Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2025-17-
12, which applied to all Bombardier, Inc., Model CL-600-1A11 (600) and 
CL-600-2A12 (601) airplanes and certain Model CL-600-2B16 (601-3A, 601-
3R, and 604 Variants) airplanes. AD 2025-17-12 required revising the 
existing maintenance or inspection program, as applicable, to 
incorporate new or more restrictive airworthiness limitations. Since 
the FAA issued AD 2025-17-12, the FAA has determined that certain 
serial numbers for affected Model CL-600-2B16 (604 Variants) airplanes 
are not included in the applicability of AD 2025-17-12. This AD 
continues to require the actions specified in AD 2025-17-12 and adds 
airplanes to the applicability. The FAA is issuing this AD to address 
the unsafe condition on these products.

DATES: This AD is effective August 18, 2026.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of October 31, 
2025 (90 FR 46330, September 26, 2025).

ADDRESSES: 
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2025-3435; or in person at Docket Operations between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD 
docket contains this final rule, the mandatory continuing airworthiness 
information (MCAI), any comments received, and other information. The 
street address for Docket Operations is U.S. Department of 
Transportation, Docket Operations, M-30, West Building Ground Floor, 
Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590.
    Material Incorporated by Reference:
    <bullet> For Bombardier material identified in this AD, contact 
Bombardier Business Aircraft Customer Response Center, 400 C[ocirc]te-
Vertu Road West, Dorval, Qu[eacute]bec H4S 1Y9, Canada; telephone 514-
855-2999; email [email protected]; website https://my.bombardier.com/.
    <bullet> You may view this material at the FAA, Airworthiness 
Products Section, Operational Safety Branch, 2200 South 216th St., Des 
Moines, WA. For information on the availability of this material at the 
FAA, call 206-231-3195. It is also available at regulations.gov under 
Docket No. FAA-2025-3435.

FOR FURTHER INFORMATION CONTACT: Brenda L. Buitrago, Aviation Safety 
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 
phone: 516-228-7300; email: [email protected].

SUPPLEMENTARY INFORMATION:

Background

    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 to supersede AD 2025-17-12, Amendment 39-23122 (90 FR 
46330, September 26, 2025) (AD 2025-17-12). AD 2025-17-12 applied to 
all Bombardier, Inc., Model CL-600-1A11 (600) and CL-600-2A12 (601) 
airplanes and certain Model CL-600-2B16 (601-3A, 601-3R, and 604 
Variants) airplanes. AD 2025-17-12 required revising the existing 
maintenance or inspection program, as applicable, to incorporate new or 
more restrictive airworthiness limitations.
    The NPRM was published in the Federal Register on October 21, 2025 
(90 FR 48414). The NPRM was prompted by AD CF-2024-16, dated May 23, 
2024 (Transport Canada AD CF-2024-16) (also referred to as the MCAI), 
issued by Transport Canada, which is the aviation authority for Canada. 
The MCAI states that new or more restrictive airworthiness limitations 
have been developed.
    In the NPRM, the FAA proposed to continue to require the actions 
specified in AD 2025-17-12 and add airplanes to the applicability. The 
FAA is issuing this AD to address new or more restrictive limitations. 
Failure to comply with these new or more restrictive limitations could 
adversely affect the continued airworthiness of the airplane.
    You may examine the MCAI in the AD docket at regulations.gov under 
Docket No. FAA-2025-3435.

Discussion of Final Airworthiness Directive

Comments

    The FAA received comments from an anonymous commenter who supported 
the NPRM without change.
    The FAA also received comments from Bombardier and the Citizens 
Rulemaking Alliance. The following presents those comments and the 
FAA's responses.

Request To Expand the Applicability

    Bombardier requested that the FAA expand the applicability of the 
proposed AD to include Model CL-600-2B16 (604 Variant) airplanes, 
serial numbers (S/Ns) 6193 through 6202 and 6204. Paragraph (c)(3) of 
the proposed AD specifies S/Ns 6050 through 6192 inclusive.
    The FAA does not agree with this request. The adjusted serial 
number range of Model CL-600-2B16 (604 Variant) airplanes would address 
airplanes not delivered with Revision 10 of the Bombardier Challenger 
650 Time Limit Maintenance Check (TLMC), Publication No. CH 650 TLMC. 
However, this AD addresses the Model CL-600-2B16 (604 Variant) 
airplanes not delivered with Revision 9 of the Bombardier Challenger 
650 TLMC, Publication No. CH 650 TLMC. To add airplanes and mandate 
Revision 10 of the TLMC would expand the AD scope beyond what was 
proposed in the original notice and would necessitate reissuing the 
notice, reopening the period for public comment, considering additional 
comments subsequently received, and issuing a final rule. In light of 
this, and in consideration of the amount of time that has already 
elapsed, the FAA has determined that further delay of this AD would not 
be in the interest of safety. However, the FAA may consider additional 
action, including further rulemaking, on this

[[Page 43026]]

issue. The FAA has not changed this AD in this regard.

Request To Revise the Service Information

    Bombardier requested that the FAA mandate the latest revisions of 
the TLMC documents: Bombardier Challenger 600 TLMC, Publication No. PSP 
605, Revision 40, dated September 30, 2025; Bombardier Challenger 601 
TLMC, Publication No. PSP 601-5, Revision 47, dated September 30, 2025; 
Bombardier Challenger 601 TLMC, Publication No. PSP 601A-5, Revision 
43, dated September 30, 2025. Bombardier also requested that the FAA 
refer to the latest revision of the TLMCs instead of the temporary 
revisions (TRs) identified in the proposed AD because all of the TRs 
have been published and included in the last published revision of the 
TLMC.
    The FAA does not agree with these requests. Mandating the newest 
TLMC revisions would expand the AD scope beyond the original notice. 
However, the FAA may consider further rulemaking on this issue. The FAA 
also provides the following clarification for the requirement to 
incorporate the information specified in the TRs. If operators 
incorporate the newest TLMC revisions into the maintenance or 
inspection program, as applicable, they are in compliance with the 
requirement to incorporate the TRs, provided the TLMC contains the same 
information as specified in the TRs.
    Similarly, if operators incorporate later TLMC revisions into the 
maintenance or inspection program, as applicable, they are in 
compliance with the requirement to incorporate the TLMCs specified in 
this AD, provided the language is identical to the information 
specified in the TLMCs identified in this AD. The FAA has not changed 
this AD in this regard.

Request To Justify Forgoing Notice and Comment or Issue an NPRM

    The Citizens Rulemaking Alliance requested that the FAA either 
provide its justification for finding good cause to bypass notice and 
comment procedures, or convert this action to an NPRM and stay the 
effective date for non-critical compliance elements. The commenter 
asserted the FAA has not adequately justified use of the good cause 
exemption to bypass notice and comment and the 30-day delayed effective 
date.
    The FAA notes the comment was submitted in response to an NPRM for 
which the FAA provided a 45-day comment period. This final rule is 
effective 35 days after its publication in the Federal Register. 
Therefore, no change to this AD is necessary.

Request To Make Incorporation by Reference (IBR) Materials Reasonably 
Available

    The Citizens Rulemaking Alliance requested that the FAA make IBR 
material available and free to the public during the comment period. 
The commenter asserted that this AD incorporates by reference 
proprietary service information that is not reasonably available to the 
public.
    The FAA's practices comply with 5 U.S.C. 552(a) of the 
Administrative Procedure Act and 1 CFR part 51. The FAA makes IBR 
materials available in the AD docket when the final rule is published 
in the Federal Register, following formal approval of the IBR by the 
Office of the Federal Register. Materials may only be posted before the 
final rule's publication if they are already publicly available or if 
there is written consent from the owner of the IBR material. All 
relevant materials incorporated by reference will be accessible in the 
AD docket on Regulations.gov, which the public can access without 
registration or fees.
    The FAA also provides summaries and access details in the preamble 
and regulatory text, makes materials available for inspection at FAA 
and National Archives and Records Administration (NARA) offices, offers 
publisher contact information, and obtains formal IBR approval from the 
Office of the Federal Register. These efforts are intended to ensure 
that all IBR materials meet the ``reasonably available'' standard 
required by 1 CFR part 51. The FAA did not change this AD as a result 
of this comment.

Request To Comply With the Paperwork Reduction Act (PRA)

    The Citizens Rulemaking Alliance requested that the FAA revise the 
AD to comply with the PRA if reporting is required or remove or suspend 
any reporting provisions until PRA requirements are satisfied. If 
reporting is intended to be voluntary, the commenter requested the FAA 
clarify that in the AD.
    The FAA notes this AD does not require reporting. If an AD were to 
require reporting, the preamble of the AD would include a paragraph 
titled ``Paperwork Reduction Act'' that would provide the applicable 
OMB control number, required PRA statements, and the estimated time to 
collect the required information (burden). Any costs associated with 
the reporting requirement would be included in the Costs of Compliance 
section in the preamble of the AD. Therefore, the FAA did not change 
this AD as a result of this comment.

Request To Consider Impact on Small Entities

    The Citizens Rulemaking Alliance requested that the FAA either 
provide the factual basis for its Regulatory Flexibility Act (RFA) 
certification that the AD will not have a significant economic impact 
on a substantial number of small entities, or prepare an initial 
regulatory flexibility analysis.
    The FAA provides the following clarification. The RFA of 1980 (5 
U.S.C. 601-612), as amended by the Small Business Regulatory 
Enforcement Fairness Act of 1996 (Pub. L. 104-121) and the Small 
Business Jobs Act of 2010 (Pub. L. 111-240), requires Federal agencies 
to consider the effects of the regulatory action on small business and 
other small entities and to minimize any significant economic impact. 
The term ``small entities'' comprises small businesses and not-for-
profit organizations that are independently owned and operated and are 
not dominant in their fields, and governmental jurisdictions with 
populations of less than 50,000.

Small Entities to Which This AD Applies

    The FAA used the definition of small entities in the RFA for this 
analysis. The RFA defines small entities as small businesses, small 
governmental jurisdictions, or small organizations. In 5 U.S.C. 601(3), 
the RFA defines ``small business'' to have the same meaning as ``small 
business concern'' under section 3 of the Small Business Act. The Small 
Business Act authorizes the Small Business Administration (SBA) to 
define ``small business'' by issuing regulations.
    The SBA (2023) has established size standards for various types of 
economic activities, or industries, under the North American Industry 
Classification System (NAICS). These size standards generally define 
small businesses based on the number of employees or annual receipts. 
The SBA definition of a small business applies to the parent company 
and all affiliates as a single entity. To identify small entities, the 
FAA first identified the primary NAICS of the entity or parent company, 
and then used data from different sources (e.g., company annual 
reports, Bureau of Transportation Statistics) to determine whether the 
entity meets the applicable size standard. The following table provides 
the SBA size standards for all industries with at least 1 impacted 
domestic entity and the estimated

[[Page 43027]]

number of affected small entities within each NAICS industry.

                                        Small Business Size Standards and Estimated Number of Small Entities \1\
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                             Number of       Number of     Percent small
                NAICS code                            Description                   Size standard            entities     small entities     entities
--------------------------------------------------------------------------------------------------------------------------------------------------------
112990...................................  All Other Animal Production.....  $2.75 million..............               1               0               0
115112...................................  Soil Preparation, Planting, and   $9.5 million...............               1               1             100
                                            Cultivating.
211120...................................  Crude Petroleum Extraction......  1,250 employees............               1               1             100
236118...................................  Residential Remodelers..........  $45.0 million..............               1               1             100
237120...................................  Oil and Gas Pipeline and Related  $45.0 million..............               1               1             100
                                            Structures Construction.
321113...................................  Sawmills........................  550 employees..............               1               1             100
325180...................................  Other Basic Inorganic Chemical    1,000 employees............               1               0               0
                                            Manufacturing.
332410...................................  Power Boiler and Heat Exchanger   750 employees..............               1               0               0
                                            Manufacturing.
332510...................................  Hardware Manufacturing..........  750 employees..............               1               1             100
333111...................................  Farm Machinery and Equipment      1,250 employees............               1               0               0
                                            Manufacturing.
334519...................................  Other Measuring and Controlling   600 employees..............               1               0               0
                                            Device Manufacturing.
335220...................................  Major Household Appliance         1,500 employees............               1               0               0
                                            Manufacturing.
336110...................................  Automobile and Light Duty Motor   1,500 employees............               2               1              50
                                            Vehicle Manufacturing.
336411...................................  Aircraft Manufacturing..........  1,500 employees............               1               1             100
336412...................................  Aircraft Engine and Engine Parts  1,500 employees............               2               0               0
                                            Manufacturing.
336510...................................  Railroad Rolling Stock            1,500 employees............               1               0               0
                                            Manufacturing.
336611...................................  Ship Building and Repairing.....  1,300 employees............               1               0               0
339112...................................  Surgical and Medical Instrument   1,000 employees............               1               0               0
                                            Manufacturing.
423860...................................  Transportation Equipment and      175 employees..............               2               2             100
                                            Supplies (except Motor Vehicle)
                                            Merchant Wholesalers.
441110...................................  New Car Dealers.................  200 employees..............               1               0               0
441227...................................  Motorcycle, ATV, and All Other    $40.0 million..............               2               2             100
                                            Motor Vehicle Dealers.
441330...................................  Automotive Parts and Accessories  $28.5 million..............               1               0               0
                                            Retailers.
445110...................................  Supermarkets and Other Grocery    $40.0 million..............               1               0               0
                                            Retailers (except Convenience
                                            Retailers).
481211...................................  Nonscheduled Chartered Passenger  1,500 employees............              76              76             100
                                            Air Transportation.
481212...................................  Nonscheduled Chartered Freight    1,500 employees............               2               2             100
                                            Air Transportation.
481219...................................  Other Nonscheduled Air            $25.0 million..............               1               1             100
                                            Transportation.
485111...................................  Mixed Mode Transit Systems......  $29.0 million..............               1               0               0
485999...................................  All Other Transit and Ground      $19.0 million..............               1               1             100
                                            Passenger Transportation.
487990...................................  Scenic and Sightseeing            $25.0 million..............               1               1             100
                                            Transportation, Other.
488190...................................  Other Support Activities for Air  $40.0 million..............               2               2             100
                                            Transportation.
488510...................................  Freight Transportation            $20.0 million..............               2               0               0
                                            Arrangement.
516120...................................  Television Broadcasting Stations  $47.0 million..............               1               1             100
518210...................................  Computing Infrastructure          $40.0 million..............               1               1             100
                                            Providers, Data Processing, Web
                                            Hosting, and Related Services.
522299...................................  International, Secondary Market,  $47.0 million..............               1               1             100
                                            and All Other Nondepository
                                            Credit Intermediation.
523910...................................  Miscellaneous Intermediation....  $47.0 million..............               2               2             100
523940...................................  Portfolio Management and          $47.0 million..............               4               4             100
                                            Investment Advice.
523991...................................  Trust, Fiduciary and Custody      $47.0 million..............               1               0               0
                                            Activities.
524126...................................  Direct Property and Casualty      1,500 employees............               1               0               0
                                            Insurance Carriers.
524210...................................  Insurance Agencies and            $15.0 million..............               1               1             100
                                            Brokerages.
525990...................................  Other Financial Vehicles........  $40.0 million..............               1               1             100
531210...................................  Offices of Real Estate Agents     $15.0 million..............               1               0               0
                                            and Brokers.
532411...................................  Commercial Air, Rail, and Water   $45.5 million..............               1               1             100
                                            Transportation Equipment Rental
                                            and Leasing.
532490...................................  Other Commercial and Industrial   $40.0 million..............               2               2             100
                                            Machinery and Equipment Rental
                                            and Leasing.
541320...................................  Landscape Architectural Services  $9.0 million...............               1               1             100
541512...................................  Computer Systems Design Services  $34.0 million..............               1               0               0
541611...................................  Administrative Management and     $24.5 million..............               1               1             100
                                            General Management Consulting
                                            Services.
541618...................................  Other Management Consulting       $19.0 million..............               1               1             100
                                            Services.
551112...................................  Offices of Other Holding          $45.5 million..............               1               0               0
                                            Companies.
561499...................................  All Other Business Support        $21.5 million..............               1               0               0
                                            Services.
562920...................................  Materials Recovery Facilities...  $25.0 million..............               1               0               0
621111...................................  Offices of Physicians (except     $16.0 million..............               1               1             100
                                            Mental Health Specialists).
621910...................................  Ambulance Services..............  $22.5 million..............               1               0               0
622110...................................  General Medical and Surgical      $47.0 million..............               1               0               0
                                            Hospitals.
624190...................................  Other Individual and Family       $16.0 million..............               1               1             100
                                            Services.
624410...................................  Child Care Services.............  $9.5 million...............               1               1             100
711211...................................  Sports Teams and Clubs..........  $47.0 million..............               1               1             100
721110...................................  Hotels (except Casino Hotels)     $40.0 million..............               1               1             100
                                            and Motels.
721120...................................  Casino Hotels...................  $40.0 million..............               1               0               0

[[Page 43028]]

 
811310...................................  Commercial and Industrial         $12.5 million..............               1               0               0
                                            Machinery and Equipment (except
                                            Automotive and Electronic)
                                            Repair and Maintenance.
812332...................................  Industrial Launderers...........  $47.0 million..............               1               0               0
813110...................................  Religious Organizations.........  $13.0 million..............               1               0               0
N/A......................................  Government Jurisdiction.........  50,000 population..........               1               0               0
                                                                                                         -----------------------------------------------
    Total................................                                    ...........................             149             117              79
--------------------------------------------------------------------------------------------------------------------------------------------------------
\1\ Source: Sources: SBA, Table of Small Business Size Standards (2023). sba.gov; Dun & Bradstreet D&B Hoovers, retrieved June 6, 2026.
  app.hoovers.dnb.com; Rocketreach, retrieved June 6, 2026. rocketreach.co; Zoominfo, retrieved June 6, 2026. zoominfo.com; Prospeo, retrieved June 6,
  2026. prospeo.io.

Projected Reporting, Recordkeeping, and Other Compliance Requirements

    The FAA estimates the total cost of the maintenance or inspection 
program actions required from this AD to be $7,650. Since operators 
incorporate maintenance or inspection program changes for their 
affected fleet(s), the FAA has determined that a per-entity estimate is 
more accurate than a per-airplane estimate. The following table 
provides the estimated per-entity compliance cost by each affected 
NAICS industry.

                                 Average Cost of Compliance per Small Entity \1\
----------------------------------------------------------------------------------------------------------------
                                                                                   Average cost    Range of cost
         NAICS industry           Number of small        Average revenue ($)       as a percent    as a percent
                                      entities                                      of revenue      of revenue
----------------------------------------------------------------------------------------------------------------
Administrative Management and                    1                      $251,230            3.05       3.05-3.05
 General Management Consulting
 Services......................
Aircraft Manufacturing.........                  1                89,460,000,000            0.00             0-0
All Other Transit and Ground                     1                     2,510,000            0.30         0.3-0.3
 Passenger Transportation......
Automobile and Light Duty Motor                  1                     2,220,000            0.34       0.34-0.34
 Vehicle Manufacturing.........
Child Care Services............                  1                     6,160,000            0.12       0.12-0.12
Commercial Air, Rail, and Water                  1                        71,600           10.68     10.68-10.68
 Transportation Equipment
 Rental and Leasing............
Computing Infrastructure                         1                    19,250,000            0.04       0.04-0.04
 Providers, Data Processing,
 Web Hosting, and Related
 Services......................
Crude Petroleum Extraction.....                  1                    28,780,000            0.03       0.03-0.03
Hardware Manufacturing.........                  1                    50,030,000            0.02       0.02-0.02
Hotels (except Casino Hotels)                    1                    36,970,000            0.02       0.02-0.02
 and Motels....................
Insurance Agencies and                           1                     3,250,000            0.24       0.24-0.24
 Brokerages....................
International, Secondary                         1                     2,500,000            0.31       0.31-0.31
 Market, and All Other
 Nondepository Credit
 Intermediation................
Landscape Architectural                          1                     6,560,000            0.12       0.12-0.12
 Services......................
Miscellaneous Intermediation...                  2                    13,140,000            0.76        0.03-1.5
Motorcycle, ATV, and All Other                   2                       357,755            2.40        1.61-3.2
 Motor Vehicle Dealers.........
Nonscheduled Chartered Freight                   2                     9,805,000            0.18       0.04-0.32
 Air Transportation............
Nonscheduled Chartered                          76                     7,155,127            0.47       0.01-3.44
 Passenger Air Transportation..
Offices of Physicians (except                    1                     9,060,000            0.08       0.08-0.08
 Mental Health Specialists)....
Oil and Gas Pipeline and                         1                    10,780,000            0.07       0.07-0.07
 Related Structures
 Construction..................
Other Commercial and Industrial                  2                       400,305            2.18       1.42-2.94
 Machinery and Equipment Rental
 and Leasing...................
Other Financial Vehicles.......                  1                    22,720,000            0.03       0.03-0.03
Other Individual and Family                      1                       999,000            0.77       0.77-0.77
 Services......................
Other Management Consulting                      1                       147,490            5.19       5.19-5.19
 Services......................
Other Nonscheduled Air                           1                     1,100,000            0.70         0.7-0.7
 Transportation................
Other Support Activities for                     2                     1,969,810            1.00       0.22-1.78
 Air Transportation............
Portfolio Management and                         4                     6,604,335            3.24      0.03-10.36
 Investment Advice.............
Residential Remodelers.........                  1                       435,450            1.76       1.76-1.76
Sawmills.......................                  1                     2,490,000            0.31       0.31-0.31
Scenic and Sightseeing                           1                     6,846,561            0.11       0.11-0.11
 Transportation, Other.........
Soil Preparation, Planting, and                  1                     2,370,000            0.32       0.32-0.32
 Cultivating...................
Sports Teams and Clubs.........                  1                    21,270,000            0.04       0.04-0.04
Television Broadcasting                          1                     1,060,000            0.72       0.72-0.72
 Stations......................
Transportation Equipment and                     2                     1,711,740            7.27       0.23-14.3
 Supplies (except Motor
 Vehicle) Merchant Wholesalers.
----------------------------------------------------------------------------------------------------------------
\1\ Source: Sources: SBA, Table of Small Business Size Standards (2023). sba.gov; Dun & Bradstreet D&B Hoovers,
  retrieved June 6, 2026. app.hoovers.dnb.com; Rocketreach, retrieved June 6, 2026. rocketreach.co; Zoominfo,
  retrieved June 6, 2026. zoominfo.com; Prospeo, retrieved June 6, 2026. prospeo.io.


[[Page 43029]]

Significant Alternatives Considered

    The FAA evaluated the alternative of not promulgating this AD but 
ultimately deemed that this alternative would create a significant 
safety hazard. The FAA is issuing this AD to address unsafe conditions, 
and this AD is necessary to maintain safety in air commerce.

RFA Conclusions

    Based on average compliance costs, the FAA has determined that the 
financial impacts of this AD are not disproportionate to small 
entities. The FAA did not change this AD as a result of this comment.

Request To Provide Additional Cost Information

    The Citizens Rulemaking Alliance requested that the FAA provide 
transparent cost assumptions including airplane downtime, logistical 
constraints, and supply chain risks.
    The FAA recognizes that, in doing the actions required by an AD, 
operators might incur indirect costs in addition to the direct costs. 
The FAA considered the impact that this AD will have on affected 
operators and determined this AD will not trigger any downtime costs, 
logistical constraints, or supply chain risks because revising the 
existing maintenance or inspection program, as applicable, is an 
administrative action that can be performed without impacting 
operations. Since the FAA has assessed and disclosed all known costs of 
the AD requirements in the Costs of Compliance section of the proposed 
AD, and the commenter did not provide additional cost data for the FAA 
to consider in its cost analysis, the FAA determined that the existing 
analysis is complete. The FAA did not change this AD as a result of 
this comment.

Conclusion

    These products have been approved by the civil aviation authority 
of another country and are approved for operation in the United States. 
Pursuant to the FAA's bilateral agreement with this State of Design 
Authority, that authority has notified the FAA of the unsafe condition 
described in the MCAI referenced above. The FAA reviewed the relevant 
data, considered any comments received, and determined that air safety 
requires adopting this AD as proposed. Accordingly, the FAA is issuing 
this AD to address the unsafe condition on these products. Except for 
minor editorial changes, this AD is adopted as proposed in the NPRM. 
None of the changes will increase the economic burden on any operator.

Material Incorporated by Reference Under 1 CFR Part 51

    This AD requires the following Bombardier material, which the 
Director of the Federal Register approved for incorporation by 
reference as of October 31, 2025 (90 FR 46333, September 26, 2025):
    <bullet> Section 5-10-00, ``Airworthiness Limitations,'' of 
Bombardier Challenger 600 Time Limits/Maintenance Checks (TLMC), 
Publication No. PSP 605, Revision 39, dated January 8, 2018. (For 
obtaining these sections of Bombardier Challenger 600 TLMC, Publication 
No. PSP 605, use Document Identification No. CH 600 TLMC.)
    <bullet> Section 5-10-00, ``Airworthiness Limitations,'' of 
Bombardier Challenger 601 TLMC, Publication No. PSP 601-5, Revision 46, 
dated January 8, 2018. (For obtaining these sections of Bombardier 
Challenger 601 TLMC, Publication No. PSP 601-5, use Document 
Identification No. CH 601 TLMC.)
    <bullet> Section 5-10-00, ``Airworthiness Limitations,'' of 
Bombardier Challenger 601 TLMC, Publication No. PSP 601A-5, Revision 
42, dated January 8, 2018. (For obtaining these sections of Bombardier 
Challenger 601 TLMC, Publication No. PSP 601A-5, use Document 
Identification No. CH 601 TLMC-1.)
    <bullet> Part 2, ``Airworthiness Limitations,'' of Bombardier 
Challenger 604 TLMC, Publication No. CH 604 TLMC, Revision 33, dated 
November 22, 2022. (The document identification number for ordering 
Bombardier Challenger 604 TLMC, Publication No. CH 604 TLMC is 
incorrectly identified as ``CH 600 TLMC'' on page 2 of the TLMC. For 
obtaining Part 2 of Bombardier Challenger 604 TLMC, Publication No. CH 
604 TLMC, use Document Identification No. CH 604 TLMC.)
    <bullet> Part 2, ``Airworthiness Limitations,'' of Bombardier 
Challenger 605 TLMC, Publication No. CH 605 TLMC, Revision 22, dated 
November 22, 2022.
    <bullet> Part 2, ``Airworthiness Limitations,'' of Bombardier 
Challenger 650 TLMC, Publication No. CH 650 TLMC, Revision 9, dated 
November 22, 2022.
    <bullet> Temporary Revision No. 5-2-5, dated October 16, 2023, 
which includes new Task 32-51-04-101*, ``Discard of the Nosewheel-
Steering Control Potentiometer Coupling Setscrews, Part No. B0201102-2-
220 (A/C 6194 and Subs or Post SB 650-32-007).''
    <bullet> Temporary Revision No. 5-2-29, dated October 25, 2023, 
which includes new Task 32-51-04-101*, ``Discard of the Nosewheel-
Steering Control Potentiometer Coupling Setscrews, Part No. B0201102-2-
220 (Post SB 605-32-010).''
    <bullet> Temporary Revision No. 5-2-73, dated October 25, 2023, 
which includes new Task 32-51-04-101*, ``Discard of the Nosewheel-
Steering Control Potentiometer Coupling Setscrews, Part No. B0201102-2-
220 (Post SB 604-32-033).''
    <bullet> Temporary Revision No. TR 5-164, dated December 23, 2022, 
which includes new Task 53-10-01-102*, ``Forward Pressure Bulkhead Cap 
Angle--Aft Side.''
    <bullet> Temporary Revision No. TR 5-165, dated October 25, 2023.
    <bullet> Temporary Revision No. TR 5-268, dated December 23, 2022, 
which includes new Task 53-10-01-103*, ``Forward Pressure Bulkhead Cap 
Angle--Aft Side.''
    <bullet> Temporary Revision No. TR 5-269, dated October 25, 2023.
    <bullet> Temporary Revision No. TR 5-282, dated December 23, 2022, 
which includes new Task 53-10-01-103*, ``Forward Pressure Bulkhead Cap 
Angle--Aft Side.''
    <bullet> Temporary Revision No. TR 5-283, dated October 25, 2023.
    (The asterisk (or ``one star'') with the last three digits of the 
task numbers listed above indicates that the task is an airworthiness 
limitation task.)
    This material is reasonably available because the interested 
parties have access to it through their normal course of business or by 
the means identified in the ADDRESSES section.

Costs of Compliance

    The FAA estimates that this AD affects 573 airplanes of U.S. 
registry and 390 operators. The FAA estimates the following costs to 
comply with this AD:
    The FAA estimates the total cost per operator for the retained 
actions from AD 2025-17-12 to be $7,650 (90 work-hours x $85 per work-
hour).
    The FAA has determined that revising the maintenance or inspection 
program takes an average of 90 work-hours per operator, although the 
agency recognizes that this number may vary from operator to operator. 
Since operators incorporate maintenance or inspection program changes 
for their affected fleet(s), the FAA has determined that a per-operator 
estimate is more accurate than a per-airplane estimate. Therefore, the 
FAA estimates the total cost per operator for the actions to be $7,650 
(90 work-hours x $85 per work-hour).
    The FAA estimates the total industry cost of this AD to be 
$2,983,500 ($7,650 x 390 operators).

[[Page 43030]]

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. Subtitle VII: Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    The FAA is issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701: General requirements. 
Under that section, Congress charges the FAA with promoting safe flight 
of civil aircraft in air commerce by prescribing regulations for 
practices, methods, and procedures the Administrator finds necessary 
for safety in air commerce. This regulation is within the scope of that 
authority because it addresses an unsafe condition that is likely to 
exist or develop on products identified in this rulemaking action.

Regulatory Findings

    This AD will not have federalism implications under Executive Order 
13132. This AD will not have a substantial direct effect on the States, 
on the relationship between the national government and the States, or 
on the distribution of power and responsibilities among the various 
levels of government.
    For the reasons discussed above, I certify this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Will not affect intrastate aviation in Alaska, and
    (3) Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

The Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by:
0
a. Removing Airworthiness Directive (AD) 2025-17-12, Amendment 39 23122 
(90 FR 46330, September 26, 2025); and
0
b. Adding the following new AD:

2026-14-09--Bombardier, Inc.: Amendment 39-23410; Docket No. FAA-
2025-3435; Project Identifier MCAI-2025-01602-T.

(a) Effective Date

    This airworthiness directive (AD) is effective August 18, 2026.

(b) Affected ADs

    This AD replaces AD 2025-17-12, Amendment 39-23122 (90 FR 46330, 
September 26, 2025) (AD 2025-17-12).

(c) Applicability

    This AD applies to Bombardier, Inc., airplanes identified in 
paragraphs (c)(1) through (3) of this AD, certificated in any 
category.
    (1) All Model CL-600-1A11 (600), CL-600-2A12 (601), and CL-600-
2B16 (601-3A and 601-3R Variants) airplanes.
    (2) Model CL-600-2B16 (604 Variant) airplanes, serial numbers 
(S/Ns) 5301 through 5665 inclusive and S/Ns 5701 through 6049 
inclusive.
    (3) Model CL-600-2B16 (604 Variant) airplanes, S/Ns 6050 through 
6192 inclusive.

(d) Subject

    Air Transport Association (ATA) of America Code 05, Time Limits/
Maintenance Checks.

(e) Unsafe Condition

    This AD was prompted by a determination that new or more 
restrictive airworthiness limitations are necessary. The FAA is 
issuing this AD to address new or more restrictive limitations. 
Failure to comply with these new or more restrictive limitations 
could adversely affect the continued airworthiness of the airplane.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Retained Revision of the Existing Maintenance or Inspection Program 
for Certain Airplanes, With Removal of References to S/Ns 5301 Through 
6049 Inclusive

    This paragraph restates the requirements of paragraph (g) of AD 
2025-17-12, with removal of references to S/Ns 5301 through 6049 
inclusive. For airplanes identified in paragraphs (c)(1) and (3) of 
this AD, comply with paragraphs (g)(1) and (2) of this AD.
    (1) Within 90 days after October 31, 2025 (the effective date of 
AD 2025-17-12), revise the existing maintenance or inspection 
program, as applicable, to incorporate the information specified in 
the applicable time limits/maintenance checks (TLMC) document 
identified in table 1 to paragraph (g)(1) of this AD. The initial 
compliance time for doing the tasks is at the time specified in the 
applicable TLMC document identified in table 1 to paragraph (g)(1) 
of this AD, or within 90 days after October 31, 2025, whichever 
occurs later.

                                   Table 1 to Paragraph (g)(1)--TLMC Documents
----------------------------------------------------------------------------------------------------------------
            Applicable airplanes                    TLMC section or part                  TLMC document
----------------------------------------------------------------------------------------------------------------
Bombardier, Inc., Model CL-600-1A11 (600)    Section 5-10-00, ``Airworthiness   Bombardier Challenger 600 TLMC,
 airplanes, serial numbers (S/Ns) 1004        Limitations''.                     Publication No. PSP 605,
 through 1085 inclusive.                                                         Revision 39, January 8,
                                                                                 2018.\1\
Bombardier, Inc., Model CL-600-2A12 (601)    Section 5-10-00, ``Airworthiness   Bombardier Challenger 601 TLMC,
 airplanes, S/Ns 3001 through 3066            Limitations''.                     Publication No. PSP 601-5,
 inclusive.                                                                      Revision 46, January 8,
                                                                                 2018.\2\
Bombardier, Inc., Model CL-600-2B16 (601-3A  Section 5-10-00, ``Airworthiness   Bombardier Challenger 601 TLMC,
 Variant) airplanes, S/Ns 5001 through 5134   Limitations''.                     Publication No. PSP 601A-5,
 inclusive; and Model CL-600-2B16 (601-3R                                        Revision 42, January 8,
 Variant) airplanes, S/Ns 5135 through 5194                                      2018.\3\
 inclusive.
Bombardier, Inc., Model CL-600-2B16 (604     Part 2, ``Airworthiness            Bombardier Challenger 650 TLMC,
 Variant) airplanes, S/Ns 6050 through 6180   Limitations''.                     Publication No. CH 650 TLMC,
 inclusive.                                                                      Revision 9, November 22, 2022.
----------------------------------------------------------------------------------------------------------------
\1\ For obtaining these sections of Bombardier Challenger 600 TLMC, Publication No. PSP 605, use Document
  Identification No. CH 600 TLMC.
\2\ For obtaining these sections of Bombardier Challenger 601 TLMC, Publication No. PSP 601-5, use Document
  Identification No. CH 601 TLMC.
\3\ For obtaining these sections of Bombardier Challenger 601 TLMC, Publication No. PSP 601A-5, use Document
  Identification No. CH 601 TLMC-1.


[[Page 43031]]

    (2) Within 90 days after October 31, 2025 (the effective date of 
AD 2025-17-12), revise the existing maintenance or inspection 
program, as applicable, to incorporate the information specified in 
the applicable temporary revisions (TRs) identified in table 2 to 
paragraph (g)(2) of this AD. The initial compliance time for doing 
the tasks is at the time specified in the applicable TR identified 
in table 2 to paragraph (g)(2) of this AD, or within 90 days after 
October 31, 2025, whichever occurs later.

                                Table 2 to Paragraph (g)(2)--Temporary Revisions
----------------------------------------------------------------------------------------------------------------
                                                                             Task number and title or life limit
             Applicable airplanes                           TR                   part number (P/N) and name
----------------------------------------------------------------------------------------------------------------
Bombardier, Inc., Model CL-600-1A11 (600)       Bombardier Temporary        53-10-01-102 *, Forward Pressure
 airplanes, S/Ns 1004 through 1085 inclusive.    Revision No. TR 5-164,      Bulkhead Cap Angle--Aft Side.
                                                 dated December 23, 2022.
Bombardier, Inc., Model CL-600-1A11 (600)       Bombardier Temporary        B0201102-2-220, Rudder Pedal
 airplanes, S/Ns 1004 through 1085 inclusive.    Revision No. TR 5-165,      Potentiometer Coupling Setscrews.
                                                 dated October 25, 2023.
Bombardier, Inc., Model CL-600-2A12 (601)       Bombardier Temporary        53-10-01-103 *, Forward Pressure
 airplanes, S/Ns 3001 through 3066 inclusive.    Revision No. TR 5-268,      Bulkhead Cap Angle--Aft Side.
                                                 dated December 23, 2022.
Bombardier, Inc., Model CL-600-2A12 (601)       Bombardier Temporary        B0201102-2-220, Rudder Pedal
 airplanes, S/Ns 3001 through 3066 inclusive.    Revision No. TR 5-269,      Potentiometer Coupling Setscrews.
                                                 dated October 25, 2023.
Bombardier, Inc., Model CL-600-2B16 (601-3A     Bombardier Temporary        53-10-01-103 *, Forward Pressure
 Variant) airplanes, S/Ns 5001 through 5134      Revision No. TR 5-282,      Bulkhead Cap Angle--Aft Side.
 inclusive; and Model CL-600-2B16 (601-3R        dated December 23, 2022.
 Variant) airplanes, S/Ns 5135 through 5194
 inclusive.
Bombardier, Inc., Model CL-600-2B16 (601-3A     Bombardier Temporary        B0201102-2-220, Rudder Pedal
 Variant) airplanes, S/Ns 5001 through 5134      Revision No. TR 5-283,      Potentiometer Coupling Setscrews.
 inclusive; and Model CL-600-2B16 (601-3R        dated October 25, 2023.
 Variant) airplanes, S/Ns 5135 through 5194
 inclusive.
Bombardier, Inc., Model CL-600-2B16 (604        Bombardier Temporary        32-51-04-101 *, Discard of the
 Variant) airplanes, S/Ns 6050 through 6192      Revision No. 5-2-5, dated   Nosewheel-Steering Control
 inclusive.                                      October 16, 2023.           Potentiometer Coupling Setscrews,
                                                                             Part No. B0201102-2-220 (A/C 6194
                                                                             and Subs or Post SB 650-32-007).
----------------------------------------------------------------------------------------------------------------

    Note 1 to table 2 to paragraph (g)(2): The asterisk (or ``one 
star'') with the last three digits of the task numbers listed in 
table 2 to paragraph (g)(2) of this AD indicates that the task is an 
airworthiness limitation task.

(h) Retained No Alternative Actions and Intervals, With No Changes

    This paragraph restates the requirements of paragraph (i) of AD 
2025-17-12, with no changes. After the existing maintenance or 
inspection program has been revised as required by paragraph (g) of 
this AD, no alternative actions (e.g., inspections) or intervals may 
be used unless the actions or intervals are approved as an 
alternative method of compliance (AMOC) in accordance with the 
procedures specified in paragraph (l)(1) of this AD.

(i) New Revision of the Existing Maintenance or Inspection Program for 
Certain Airplanes

    For airplanes identified in paragraph (c)(2) of this AD: Comply 
with paragraphs (i)(1) and (2) of this AD.
    (1) Within 90 days after the effective date of this AD, revise 
the existing maintenance or inspection program, as applicable, to 
incorporate the information specified in the applicable TLMC 
document identified in table 3 to paragraph (i)(1) of this AD. The 
initial compliance time for doing the tasks is at the time specified 
in the applicable TLMC document identified in table 3 to paragraph 
(i)(1) of this AD, or within 90 days after the effective date of 
this AD, whichever occurs later, except as provided by paragraph (j) 
of this AD.

               Table 3 to Paragraph (i)(1)--TLMC Documents
------------------------------------------------------------------------
     Applicable airplanes           TLMC part          TLMC document
------------------------------------------------------------------------
Bombardier, Inc., Model CL-600- Part 2,            Bombardier Challenger
 2B16 (604 Variant) airplanes,   ``Airworthiness    604 TLMC,
 S/Ns 5301 through 5665          Limitations''.     Publication No. CH
 inclusive.                                         604 TLMC, Revision
                                                    33, November 22,
                                                    2022.\1\
Bombardier, Inc., Model CL-600- Part 2,            Bombardier Challenger
 2B16 (604 Variant) airplanes,   ``Airworthiness    605 TLMC,
 S/Ns 5701 through 6049          Limitations''.     Publication No. CH
 inclusive.                                         605 TLMC, Revision
                                                    22, November 22,
                                                    2022.
------------------------------------------------------------------------
\1\ The document identification number for ordering Bombardier
  Challenger 604 TLMC, Publication No. CH 604 TLMC is incorrectly
  identified as ``CH 600 TLMC'' on page 2 of the TLMC. For obtaining
  Part 2 of Bombardier Challenger 604 TLMC, Publication No. CH 604 TLMC,
  use Document Identification No. CH 604 TLMC.

    (2) Within 90 days after the effective date of this AD, revise 
the existing maintenance or inspection program, as applicable, to 
incorporate the information specified in the applicable TRs 
identified in table 4 to paragraph (i)(2) of this AD. The initial 
compliance time for doing the tasks is at the time specified in the 
applicable TR identified in table 4 to paragraph (i)(2) of this AD, 
or within 90 days after the effective date of this AD, whichever 
occurs later.

[[Page 43032]]



                                Table 4 to Paragraph (i)(2)--Temporary Revisions
----------------------------------------------------------------------------------------------------------------
                                                                        Task number and title or life limit P/N
          Applicable airplanes                         TR                               and name
----------------------------------------------------------------------------------------------------------------
Bombardier, Inc., Model CL-600-2B16 (604  Bombardier Temporary         32-51-04-101 *, Discard of the Nosewheel-
 Variant) airplanes, S/Ns 5301 through     Revision No. 5-2-73, dated   Steering Control Potentiometer Coupling
 5665 inclusive.                           October 25, 2023.            Setscrews, Part No. B0201102-2-220 (Post
                                                                        SB 604-32-033).
Bombardier, Inc., Model CL-600-2B16 (604  Bombardier Temporary         32-51-04-101 *, Discard of the Nosewheel-
 Variant) airplanes, S/Ns 5701 through     Revision No. 5-2-29, dated   Steering Control Potentiometer Coupling
 6049 inclusive.                           October 25, 2023.            Setscrews, Part No. B0201102-2-220 (Post
                                                                        SB 605-32-010).
----------------------------------------------------------------------------------------------------------------

    Note 2 to table 4 to paragraph (i)(2): The asterisk (or ``one 
star'') with the last three digits of the task numbers listed in 
table 4 to paragraph (i)(2) of this AD indicates that the task is an 
airworthiness limitation task.

(j) Compliance Time Exception for a Certain Task

    For airplanes identified in paragraph (c)(2) of this AD: The 
initial compliance time for task 27-42-01-110, ``Special Detailed 
Inspection of the Horizontal Stabilizer Trim Actuator (HSTA), P/N 
604-92305-7 and Subs (Vendor P/N 8454-3 and Subs),'' of section 5-
10-40, ``Certification Maintenance Requirements,'' of Part 2, 
``Airworthiness Limitations,'' of Bombardier Challenger 604 TLMC, 
Publication No. CH 604 TLMC, Revision 33, dated November 22, 2022; 
or Bombardier Challenger 605 TLMC, Publication No. CH 605 TLMC, 
Revision 22, dated November 22, 2022; as applicable, is at the 
applicable compliance time specified in paragraph (j)(1) or (2) of 
this AD, or within 90 days after the effective date of this AD, 
whichever occurs later.
    (1) For HSTA having P/N 604-92305-3 (vendor P/N 8454-1) or P/N 
604-92305-5 (vendor P/N 8454-2) that were replaced with P/N 604-
92305-7 (vendor P/N 8454-3) in accordance with paragraph (j) of AD 
2015-05-07, Amendment 39-18117 (80 FR 13483, March 16, 2015): Within 
12 years after accomplishing the replacement.
    (2) For HSTA having P/N 604-92305-7 (vendor P/N 8454-3) 
manufactured before November 1, 2015: Within 12 years from the part 
entry into service.

(k) New No Alternative Actions or Intervals

    After the existing maintenance or inspection program has been 
revised as required by paragraph (i) of this AD, no alternative 
actions (e.g., inspections) or intervals may be used unless the 
actions or intervals are approved as an AMOC in accordance with the 
procedures specified in paragraph (l)(1) of this AD.

(l) Additional AD Provisions

    The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, 
International Validation Branch, FAA, has the authority to approve 
AMOCs for this AD, if requested using the procedures found in 14 CFR 
39.19. In accordance with 14 CFR 39.19, send your request to your 
principal inspector or responsible Flight Standards Office, as 
appropriate. If sending information directly to the manager of the 
International Validation Branch, send it to the attention of the 
person identified in paragraph (m) of this AD and email to: 
[email protected]. Before using any approved AMOC, notify your 
appropriate principal inspector, or lacking a principal inspector, 
the manager of the responsible Flight Standards Office.
    (2) Contacting the Manufacturer: For any requirement in this AD 
to obtain instructions from a manufacturer, the instructions must be 
accomplished using a method approved by the Manager, International 
Validation Branch, FAA; or Transport Canada; or Bombardier's 
Transport Canada Design Approval Organization (DAO). If approved by 
the DAO, the approval must include the DAO-authorized signature.

(m) Additional Information

    For more information about this AD, contact Brenda L. Buitrago, 
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 11590; phone: 516-228 7300; email: [email protected].

(n) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the material listed in this 
paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this material as applicable to do the actions 
required by this AD, unless this AD specifies otherwise.
    (3) The following material was approved for IBR on October 31, 
2025 (90 FR 46330, September 26, 2025).
    (i) Section 5-10-00, ``Airworthiness Limitations,'' of 
Bombardier Challenger 600 Time Limits/Maintenance Checks (TLMC), 
Publication No. PSP 605, Revision 39, dated January 8, 2018.
    Note 3 to paragraph (n)(3)(i): For obtaining this section of 
Bombardier Challenger 600 TLMC, Publication No. PSP 605, use 
Document Identification No. CH 600 TLMC.
    (ii) Section 5-10-00, ``Airworthiness Limitations,'' of 
Bombardier Challenger 601 TLMC, Publication No. PSP 601-5, Revision 
46, dated January 8, 2018.
    Note 4 to paragraph (n)(3)(ii): For obtaining this section 
Bombardier Challenger 601 TLMC, Publication No. PSP 601-5, use 
Document Identification No. CH 601 TLMC.
    (iii) Section 5-10-00, ``Airworthiness Limitations,'' of 
Bombardier Challenger 601 TLMC, Publication No. PSP 601A-5, Revision 
42, dated January 8, 2018.
    Note 5 to paragraph (n)(3)(iii): For obtaining this section of 
Bombardier Challenger 601 TLMC, Publication No. PSP 601A-5, use 
Document Identification No. CH 601 TLMC-1.
    (iv) Part 2, ``Airworthiness Limitations,'' of Bombardier 
Challenger 604 TLMC, Publication No. CH 604 TLMC, Revision 33, dated 
November 22, 2022.
    Note 6 to paragraph (n)(3)(iv): The document identification 
number for ordering Bombardier Challenger 604 TLMC, Publication No. 
CH 604 TLMC is incorrectly identified as ``CH 600 TLMC'' on page 2 
of the TLMC. For obtaining Part 2 of Bombardier Challenger 604 TLMC, 
Publication No. CH 604 TLMC, use Document Identification No. CH 604 
TLMC.
    (v) Part 2, ``Airworthiness Limitations,'' of Bombardier 
Challenger 605 TLMC, Publication No. CH 605 TLMC, Revision 22, dated 
November 22, 2022.
    (vi) Part 2, ``Airworthiness Limitations,'' of Bombardier 
Challenger 650 TLMC, Publication No. CH 650 TLMC, Revision 9, dated 
November 22, 2022.
    (vii) Bombardier Temporary Revision No. 5-2-5, dated October 16, 
2023.
    (viii) Bombardier Temporary Revision No. 5-2-29, dated October 
25, 2023.
    (ix) Bombardier Temporary Revision No. 5-2-73, dated October 25, 
2023.
    (x) Bombardier Temporary Revision No. TR 5-164, dated December 
23, 2022.
    (xi) Bombardier Temporary Revision No. TR 5-165, dated October 
25, 2023.
    (xii) Bombardier Temporary Revision No. TR 5-268, dated December 
23, 2022.
    (xiii) Bombardier Temporary Revision No. TR 5-269, dated October 
25, 2023.
    (xiv) Bombardier Temporary Revision No. TR 5-282, dated December 
23, 2022.
    (xv) Bombardier Temporary Revision No. TR 5-283, dated October 
25, 2023.
    (4) For Bombardier material identified in this AD, contact 
Bombardier Business Aircraft Customer Response Center, 400 
C[ocirc]te-Vertu Road West, Dorval, Qu[eacute]bec H4S 1Y9, Canada; 
telephone 514-855-2999; email [email protected]; website 
https://my.bombardier.com/.
    (5) You may view this material at the FAA, Airworthiness 
Products Section, Operational Safety Branch, 2200 South 216th St., 
Des Moines, WA. For information on the availability of this material 
at the FAA, call 206-231-3195.
    (6) You may view this material at the National Archives and 
Records Administration (NARA). For information on the availability 
of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email [email protected].

    Issued on July 9, 2026.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2026-14110 Filed 7-13-26; 8:45 am]
BILLING CODE 4910-13-P

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