Airworthiness Directives; Bombardier, Inc., Airplanes

[Federal Register Volume 89, Number 218 (Tuesday, November 12, 2024)]
[Rules and Regulations]
[Pages 88884-88886]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-25979]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-2007; Project Identifier MCAI-2023-01270-T; 
Amendment 39-22871; AD 2024-21-04]
RIN 2120-AA64


Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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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 determination that new or more restrictive maintenance tasks are 
necessary. This AD requires revising the existing maintenance or 
inspection program, as applicable, to incorporate new or more 
restrictive maintenance tasks. The FAA is issuing this AD to address 
the unsafe condition on these products.

DATES: This AD is effective December 17, 2024.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of December 17, 
2024.

ADDRESSES: 
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2024-2007; 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, Inc. 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 bombardier.com">ac.yul@aero.bombardier.com; website 
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-2024-2007.

FOR FURTHER INFORMATION CONTACT: Steven Dzierzynski, Aviation Safety 
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 
telephone: 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 published in the Federal Register 
on August 9, 2024 (89 FR 65267). The NPRM was prompted by AD CF-2023-
78, dated December 19, 2023, issued by Transport Canada, which is the 
aviation authority for Canada (also referred to as the MCAI). The MCAI 
states that airplanes could experience misleading electrical system 
status indications (push button annunciators (PBA) and engine 
instrument and crew alerting system (EICAS)) as a result of 
contamination of electrical contacts in the left-hand (LH) direct 
current power center (DCPC) internal communication data bus. The MCAI 
states that new or more restrictive maintenance tasks have been 
developed to rectify lower time LH DCPC units not addressed by 
previously issued ADs.
    In the NPRM, the FAA proposed to require revising the existing 
maintenance or inspection program, as applicable, to incorporate new or 
more restrictive maintenance tasks. The FAA is issuing this AD to 
address erratic indications, which could cause the flightcrew to turn 
off fully operational electrical power sources, leading to partial or 
complete loss of electrical power. The unsafe condition, if not 
addressed, could result in loss of flight displays and reduced 
controllability of the airplane.
    You may examine the MCAI in the AD docket at regulations.gov under 
Docket No. FAA-2024-2007.

Discussion of Final Airworthiness Directive

Comments

    The FAA received no comments on the NPRM or on the determination of 
the cost to the public.

Conclusion

    This product has been approved by the aviation authority of another 
country and is approved for operation in the United States. Pursuant to 
the FAA's bilateral agreement with this State of Design Authority, it 
has notified the FAA of the unsafe condition described in the MCAI 
referenced above. The FAA reviewed the relevant data and determined 
that air safety requires adopting this AD as proposed. Accordingly, the 
FAA is issuing this AD to address the unsafe condition on this product. 
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

    The FAA reviewed the following documents:
    <bullet> Task 24-61-01-101*, ``Restoration of the left DC Power 
Center (DCPC) (Pre SB100-24-30),'' Section 5-10-20, ``Time Limits--
Supplementary Limitations,'' of Part 2, ``Airworthiness Limitations'', 
of the Bombardier Challenger 300 Time Limits/Maintenance Checks, 
Publication No. CH 300 TLMC, Revision 24, dated August 9, 2023.
    <bullet> Task 24-61-01-101*, ``Restoration of the Left DC Power 
Center (DCPC) (Pre SB350-24-005),'' Section 5-10-20, ``Time Limits--
Supplementary Limitations,'' of Part 2, ``Airworthiness Limitations,'' 
of the Bombardier Challenger 350 Time Limits/Maintenance Checks, 
Publication No. CH 350 TLMC, Revision 14, dated August 9, 2023.
    This material specifies new or more restrictive airworthiness 
limitations for

[[Page 88885]]

safe life limits. These documents are distinct since they apply to 
different airplane configurations. The asterisk (or ``one star'') with 
the last three digits of the task numbers 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 ADDRESSES section.

Costs of Compliance

    The FAA estimates that this AD affects 356 airplanes of U.S. 
registry. The FAA estimates the following costs to comply with this AD.
    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 
agency estimates the average total cost per operator to be $7,650 (90 
work-hours x $85 per work-hour).

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:

2024-21-04 Bombardier, Inc.: Amendment 39-22871; Docket No. FAA-
2024-2007; Project Identifier MCAI-2023-01270-T.

(a) Effective Date

    This airworthiness directive (AD) is effective December 17, 
2024.

(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 24, Electrical 
Power.

(e) Unsafe Condition

    This AD was prompted by a determination that new or more 
restrictive maintenance tasks are necessary. The FAA is issuing this 
AD to address erratic indications, which could cause the flightcrew 
to turn off fully operational electrical power sources, leading to 
partial or complete loss of electrical power. The unsafe condition, 
if not addressed, could result in loss of flight displays and 
reduced controllability of the airplane.

(f) Compliance

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

(g) Maintenance or Inspection Program Revision

    Within 60 days after the effective date of this AD, revise the 
existing maintenance or inspection program, as applicable, to 
incorporate the information specified in the tasks specified in 
figure 1 to paragraph (g) of this AD, of Part 2, ``Airworthiness 
Limitations,'' of the applicable Time Limits/Maintenance Checks 
(TLMC) manual. The initial compliance time for doing the tasks is at 
the interval specified in the applicable TLMC manual specified in 
figure 1 to paragraph (g) of this AD, or within 60 days after the 
effective date of this AD, whichever occurs later.

                     Figure 1 to Paragraph (g)--Time Limits--Supplementary Limitations Tasks
----------------------------------------------------------------------------------------------------------------
                                 Chapter 5 task
        Airplane model                No.               Task title            TLMC section            TLMC
----------------------------------------------------------------------------------------------------------------
BD-100-1A10 (Challenger 300).     24-61-01-101 *  Restoration of the     5-10-20, ``Time        Revision 24,
                                                   Left DC Power Center   Limits--Supplementar   dated August 9,
                                                   (DCPC) (Pre SB100-24-  y Limitations''.       2023.
                                                   30).
BD-100-1A10 (Challenger 350).     24-61-01-101 *  Restoration of the     5-10-20, ``Time        Revision 14,
                                                   Left DC Power Center   Limits--Supplementar   dated August 9,
                                                   (DCPC) (Pre SB350-24-  y Limitations''.       2023.
                                                   005).
----------------------------------------------------------------------------------------------------------------


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

(h) No Alternative Actions or Intervals

    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 and intervals are approved as an alternative method of 
compliance (AMOC) in accordance with the procedures specified in 
paragraph (i)(1) of this AD.

[[Page 88886]]

(i) Other FAA 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, mail it to the address identified 
in paragraph (j) of this AD. Information may be emailed 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, Inc.'s 
Transport Canada Design Approval Organization (DAO). If approved by 
the DAO, the approval must include the DAO-authorized signature.

(j) Additional Information

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

(k) 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.
    (i) Task 24-61-01-101*, ``Restoration of the left DC Power 
Center (DCPC) (Pre SB100-24-30),'' Section 5-10-20, ``Time Limits--
Supplementary Limitations,'' of Part 2, ``Airworthiness 
Limitations'', of the Bombardier Challenger 300 Time Limits/
Maintenance Checks, Publication No. CH 300 TLMC, Revision 24, dated 
August 9, 2023.

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

    (ii) Task 24-61-01-101*, ``Restoration of the Left DC Power 
Center (DCPC) (Pre SB350-24-005),'' Section 5-10-20, ``Time Limits--
Supplementary Limitations,'' of Part 2, ``Airworthiness 
Limitations,'' of the Bombardier Challenger 350 Time Limits/
Maintenance Checks, Publication No. CH 350 TLMC, Revision 14, dated 
August 9, 2023.
    (3) For Bombardier Inc. 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 bombardier.com">ac.yul@aero.bombardier.com; website 
bombardier.com.
    (4) You may view this material at the FAA, Airworthiness 
Products Section, Operational Safety Branch, 2200 South 216th 
Street, 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/[email protected]">www.archives.gov/federal-register/cfr/[email protected].

    Issued on October 24, 2024.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2024-25979 Filed 11-8-24; 8:45 am]
BILLING CODE 4910-13-P

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