Airworthiness Directives; Bombardier, Inc., Airplanes

[Federal Register Volume 91, Number 13 (Wednesday, January 21, 2026)]
[Rules and Regulations]
[Pages 2459-2461]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2026-01032]



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                                                Federal Register
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Federal Register / Vol. 91, No. 13 / Wednesday, January 21, 2026 / 
Rules and Regulations

[[Page 2459]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2025-1351; Project Identifier MCAI-2024-00667-T; 
Amendment 39-23242; AD 2026-02-06]
RIN 2120-AA64


Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all 
Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was prompted by 
a report that some parts of horizontal stabilizer trim actuators 
(HSTAs) that were meant to be replaced through a required overhaul were 
not replaced and were instead reinstalled on the HSTAs. This AD 
requires verification of the HSTA serial number, and, if applicable, 
replacement of the HSTA. This AD also prohibits the installation of 
affected parts under certain conditions. The FAA is issuing this AD to 
address the unsafe condition on these products.

DATES: This AD is effective February 25, 2026.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of February 25, 
2026.

ADDRESSES: 
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2025-1351; 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 
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-2025-1351.

FOR FURTHER INFORMATION CONTACT: John Massey, 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 by adding an AD that would apply to all Bombardier, Inc., 
Model BD-100-1A10 airplanes. The NPRM was published in the Federal 
Register on July 2, 2025 (90 FR 28916). The NPRM was prompted by AD CF-
2024-38, dated November 12, 2024 (Transport Canada AD CF-2024-38) (also 
referred to as the MCAI), issued by Transport Canada, which is the 
aviation authority for Canada. The MCAI states that Bombardier has been 
advised that the overhaul required by certificate maintenance 
requirement (CMR) task 27-40-00-104* was not fully completed on some 
units. As a result, some of the parts that were required to be replaced 
on the affected HSTAs as part of the overhauled task were re-installed 
in error. This condition, if not corrected, can lead to the failure of 
HSTA components, which can contribute to horizontal stabilizer surface 
disconnect at the actuator level and could lead to loss of continued 
safe flight and landing.
    In the NPRM, the FAA proposed to require verification of the HSTA 
serial number, and, if applicable, replacement of the HSTA. The FAA 
also proposed to prohibit the installation of affected parts under 
certain conditions. The FAA is issuing this AD to address the unsafe 
condition on these products.
    You may examine the MCAI in the AD docket at regulations.gov under 
Docket No. FAA-2025-1351.

Discussion of Final Airworthiness Directive

Comments

    The FAA received a comment from NetJets. The following presents the 
comment received on the NPRM and the FAA's response.

Request To Clarify Requirement if Modification Plate Is Marked

    NetJets asked whether an affected HSTA, found during the proposed 
inspection or records review, would need to be replaced if its 
modification plate is marked with Moog Service Bulletin C47100-27-07, 
as specified in section 2.B. of Bombardier Service Bulletin 350-27-014.
    The FAA clarifies that an affected HSTA does not need to be 
replaced if it has a modification plate marked with Moog Service 
Bulletin C47100-27-07 because that marking indicates the part has 
already been properly reworked. The FAA recognizes that this relief is 
specified in paragraph 2.B.(4)(b) of the Bombardier service bulletin, 
and that Transport Canada AD CF-2024-38 allows installation of a part 
marked with the Moog service bulletin. Accordingly, the FAA has revised 
paragraph (h) of this AD to except any affected HSTA marked with the 
Moog service bulletin.

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, and any other changes described previously, 
this AD is adopted as proposed in the NPRM. None of the changes will 
increase the economic burden on any operator.

[[Page 2460]]

Material Incorporated by Reference Under 1 CFR Part 51

    The FAA reviewed the following Bombardier material:
    <bullet> Bombardier Service Bulletin 100-27-23, dated October 28, 
2024;
    <bullet> Bombardier Service Bulletin 350-27-014, dated October 28, 
2024.
    This material specifies procedures for verifying the HSTA serial 
number and, if applicable, corrective actions to include replacing the 
HSTA. These documents are distinct since they apply to different 
airplane configurations.
    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 982 airplanes of U.S. 
registry. The FAA estimates the following costs to comply with this AD:

                                      Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
           Labor cost              Parts cost         Cost per product               Cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
Up to 2 work-hours x $85 per               $0  Up to $170....................  Up to $166,940.
 hour = Up to $170.
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any on-condition action 
that would be required based on the results of any required actions. 
The FAA has no way of determining the number of aircraft that might 
need this on-condition action:

                 Estimated Costs of On-Condition Actions
------------------------------------------------------------------------
              Labor cost                Parts cost     Cost per product
------------------------------------------------------------------------
20 work-hours x $85 per hour = $1,700      $53,665              $55,365
------------------------------------------------------------------------

    The FAA has included all known costs in its cost estimate. 
According to the manufacturer, however, some or all of the costs of 
this AD may be covered under warranty, thereby reducing the cost impact 
on affected operators.

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 that 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 adding the following new airworthiness 
directive:

2026-02-06 Bombardier, Inc.: Amendment 39-23242; Docket No. FAA-
2025-1351; Project Identifier MCAI-2024-00667-T.

(a) Effective Date

    This airworthiness directive (AD) is effective February 25, 
2026.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all Bombardier, Inc., Model BD-100-1A10 
airplanes, certificated in any category.

(d) Subject

    Air Transport Association (ATA) of America Code 27, Flight 
controls.

(e) Unsafe Condition

    This AD was prompted by a report that some parts of horizontal 
stabilizer trim actuators (HSTAs) that were meant to be replaced 
through a required overhaul were not replaced and were instead 
reinstalled on the HSTAs. The FAA is issuing this AD to address HSTA 
parts that were not replaced as required. The unsafe condition, if 
not addressed, could result in the failure of HSTA components, which 
can contribute to horizontal stabilizer surface disconnect at the 
actuator level and could lead to loss of continued safe flight and 
landing.

(f) Compliance

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

(g) Records Verification and Corrective Actions

    At the applicable time specified in figure 1 to paragraph (g) of 
this AD, do an inspection to determine the serial number of HSTA 
part number C47100-004 or C47100-005 in accordance with Section 
2.B., Part A, of the Accomplishment Instructions of Bombardier 
Service Bulletin 100-27-23 or 350-27-014, both dated October 28, 
2024, as

[[Page 2461]]

applicable. A review of the airplane maintenance records is also 
acceptable provided the serial number of the HSTA can be 
conclusively determined from that review.

   Figure 1 to Paragraph (g)--Compliance Time for Records Verification
------------------------------------------------------------------------
 HSTA total flight hours accumulated as of
       the effective date of this AD               Compliance time
------------------------------------------------------------------------
10,000 or more............................  Before accumulating 14,500
                                             total flight hours on the
                                             HSTA, or before
                                             accumulating 7,500 total
                                             flight cycles on the HSTA,
                                             or within 24 months after
                                             the effective date of this
                                             AD, whichever occurs first.
9,700 or more but less than 10,000........  Before accumulating 14,500
                                             total flight hours on the
                                             HSTA, or before
                                             accumulating 7,500 total
                                             flight cycles on the HSTA,
                                             or within 36 months after
                                             the effective date of this
                                             AD, whichever occurs first.
Less than 9,700...........................  Before accumulating 14,500
                                             total flight hours on the
                                             HSTA, or before
                                             accumulating 7,500 total
                                             flight cycles on the HSTA,
                                             or within 48 months after
                                             the effective date of this
                                             AD, whichever occurs first.
------------------------------------------------------------------------

(h) HSTA Replacement

    If, during the inspection or records review required by 
paragraph (g) of this AD, any HSTA having part number C47100-004 or 
C47100-005, with a serial number listed in Section 1.A. of 
Bombardier Service Bulletin 100-27-23 or 350-27-014, both dated 
October 28, 2024, as applicable is found: At the applicable time 
specified in figure 1 to paragraph (g) of this AD, replace the HSTA 
in accordance with Sections 2.C. and 2.D. of the Accomplishment 
Instructions of Bombardier Service Bulletin 100-27-23 or 350-27-014, 
both dated October 28, 2024, as applicable, unless the HSTA has a 
modification plate marked with Moog Service Bulletin C47100-27-07.

(i) Parts Installation Limitation

    As of the effective date of this AD, no person may install, on 
any airplane, an HSTA, part number C47100-004 or C47100-005, with a 
serial number listed in Section 1.A. of Bombardier Service Bulletin 
100-27-23 or 350-27-014, both dated October 28, 2024, unless the 
HSTA has a modification plate marked with Moog Service Bulletin 
C47100-27-07.

(j) 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 (k) 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.

(k) Additional Information

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

(l) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference 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.
    (i) Bombardier Service Bulletin 100-27-23, dated October 28, 
2024.
    (ii) Bombardier Service Bulletin 350-27-014, dated October 28, 
2024.
    (3) 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/.
    (4) 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.
    (5) 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 January 14, 2026.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2026-01032 Filed 1-20-26; 8:45 am]
BILLING CODE 4910-13-P

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