DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-2397; Project Identifier MCAI-2023-00601-T;
Amendment 39-22730; AD 2024-07-09]
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
certain Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes.
This AD was prompted by the discovery that existing maintenance tasks
do not detect the potential failure of the passenger door detent
mechanism because there is no procedure for inspecting the passenger
door locking mechanism. This AD requires revising the maintenance or
inspection program, as applicable, to require use of a certain aircraft
maintenance manual (AMM) task during accomplishment of a specified
maintenance check. The FAA is issuing this AD to address the unsafe
condition on these products.

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

ADDRESSES:
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2023-2397; 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:
For Bombardier material, contact Bombardier Business
Aircraft Customer Response Center, 400 Cote-Vertu Road West,
Dorval, Quebec H4S 1Y9, Canada; telephone 514-855-2999; email
ac.yul@aero.bombardier.com; website bombardier.com.
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-2023-2397.

FOR FURTHER INFORMATION CONTACT: Gabriel Kim, Aviation Safety Engineer,
FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516-
228-7300; email: 9-avs-nyaco-cos@faa.gov.

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 certain Bombardier,
Inc., Model BD-700-1A10 and BD-700-1A11 airplanes. The NPRM published
in the Federal Register on December 22, 2023 (88 FR 88541). The NPRM
was prompted by AD CF-2023-25, dated April 13, 2023 (referred to after
this as the MCAI), issued by Transport Canada, which is the aviation
authority for Canada. The MCAI states time limited maintenance check
(TLMC) item 52-11-00-201, ``Passenger Door Mechanism Functional Test,''
does not detect potential failure of the passenger door detent
mechanism. Associated aircraft maintenance manual (AMM) task 52-11-00-
720-801, ``Passenger Door Mechanism Functional Test,'' does not provide
a procedure for inspecting the passenger door locking mechanism.
In the NPRM, the FAA proposed to require revising the maintenance
or inspection program, as applicable, to require use of a certain AMM
task during accomplishment of a specified maintenance check. The FAA is
issuing this AD to address potential failures of the uninspected
detents (external handle detent and torque tube detent) in combination
with a failure of the tension pot spring assembly. The unsafe
condition, if not addressed, could result in the main passenger door
opening during unpressurized flight.
You may examine the MCAI in the AD docket at regulations.gov under
Docket No. FAA-2023-2397.

Discussion of Final Airworthiness Directive

Comments

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

Request To Refer to Most Recent AMM Revision Level

NetJets Inc. asked that the AMM task revision levels identified in
the NPRM be changed, as there have been recent improvements to the
documents. NetJets Inc. added that credit for the revisions currently
listed should also be included in the proposed AD. Bombardier noted
that the referenced AMM revision levels were revised during the public
comment period of the NPRM.
The FAA provides the following clarification denoting that the
requested changes are unnecessary. This AD requires incorporating the
information specified in the referenced AMM revisions identified in
figure 1 to paragraph (g) of this AD. The language in paragraph (g) of
this AD allows the incorporation of the specific information,
regardless of the AMM revision level in use, provided the language is
identical to the information provided in Task 52-11-00-720-801,
specified in the applicable AMMs specified in figure 1 to paragraph (g)
of this AD. The language in a later revision of the applicable AMMs
specified in figure 1 to paragraph (g) of this AD may be incorporated
if it is identical. Therefore, if operators incorporate later AMMs into
the maintenance or inspection program, as applicable, with identical
language they are in compliance with paragraph (g) of this AD. The FAA
has confirmed that the revisions cited by the commenter are
identical to the revisions specified in this AD.
If the language provided in a later AMM revision is not identical
to the language provided in the task specified in the applicable AMMs
specified in figure 1 to paragraph (g) of this AD, operators must
submit a request for approval of an alternate method of compliance
(AMOC) with supporting data that demonstrates an acceptable level of
safety for a task that differs from Task 52-11-00-720-801. The FAA has
revised paragraph (g) of this AD to clarify that it's the information
in the applicable AMM that is mandated and not limited to the AMM
revision specified in figure 1 of paragraph (g) of this AD.

Additional Change to This AD

Paragraph (i) of this AD has been added to clarify that no changes
to actions required by paragraph (g) of this AD are allowed without an
AMOC, which also reinforces the provisions of paragraph (h) of this AD.

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, considered the
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 this product. 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.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Task 52-11-00-720-801, ``Functional Test of the
Passenger Door Mechanism,'' Subject 52-11-00, ``Passenger Door,''
Chapter 52, ``Doors,'' of the following AMMs. This task specifies new
inspection instructions for the passenger door detent mechanisms.
Bombardier Global Express AMM, Part Two, Publication No.
BD-700 AMM, Revision 97, dated March 30, 2023. (For obtaining the task
for Bombardier Global Express AMM, Part Two, Publication No. BD-700
AMM, use Document Identification No. GL 700 AMM.)
Bombardier Global 5000 AMM, Part Two, Publication No. BD-
700 AMM, Revision 78, dated March 30, 2023. (For obtaining the task for
Bombardier Global 5000 AMM, Part Two, Publication No. BD-700 AMM, use
Document Identification No. GL 5000 AMM.)
Bombardier Global 5000 Featuring Global Vision Flight Deck
AMM, Part Two, Publication No. GL 5000 GVFD AMM, Revision 45, dated
March 30, 2023.
Bombardier Global 5500 AMM, Part Two, Publication No. GL
5500 AMM, Revision 14, dated March 30, 2023.
Bombardier Global 6000 AMM, Part Two, Publication No. GL
6000 AMM, Revision 46, dated March 30, 2023.
Bombardier Global 6500 AMM, Part Two, Publication No. GL
6500 AMM, Revision 15, dated March 30, 2023.
Bombardier Global Express XRS AMM, Part Two, Publication
No. BD-700 XRS AMM, Revision 75, dated March 30, 2023. (For obtaining
the task for Bombardier Global Express XRS AMM, Part Two, Publication
No. BD-700 XRS AMM, use Document Identification No. GL XRS AMM.)
This service information 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 482 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

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]

2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive: