DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-0228; Project Identifier MCAI-2022-00599-T]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11
airplanes. This proposed AD was prompted by a determination that new or
more restrictive airworthiness limitations for certain brake
accumulators are necessary. This proposed AD would require revising the
existing maintenance or inspection program, as applicable, to
incorporate new or more restrictive airworthiness limitations. This
proposed AD would also require determining the accumulated landings on
the affected brake accumulators. The FAA is proposing this AD to
address the unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by April 18,
2024.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to regulations.gov. Follow
the instructions for submitting comments.
Fax: 202-493-2251.
Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2024-0228; 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 NPRM, the mandatory continuing airworthiness
information (MCAI), any comments received, and other information. The
street address for Docket Operations is listed above.
Material Incorporated by Reference:
For service information identified in this NPRM, 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 service information 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.

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

SUPPLEMENTARY INFORMATION:

Comments Invited

The FAA invites you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under ADDRESSES. Include ``Docket No. FAA-2024-0228; Project Identifier
MCAI-2022-00599-T'' at the beginning of your comments. The most helpful
comments reference a specific portion of the proposal, explain the
reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend
the proposal because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
regulations.gov, including any personal information you provide. The
agency will also post a report summarizing each substantive verbal
contact received about this NPRM.

Confidential Business Information

CBI is commercial or financial information that is both customarily
and actually treated as private by its owner. Under the Freedom of
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public
disclosure. If your comments responsive to this NPRM contain commercial
or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to
this NPRM, it is important that you clearly designate the submitted
comments as CBI. Please mark each page of your submission containing
CBI as ``PROPIN.'' The FAA will treat such marked submissions as
confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to Mark
Taylor, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; telephone 516-228-7300; email 9-avs-nyaco-cos@faa.gov.
Any commentary that the FAA receives which is not
specifically designated as CBI will be placed in the public docket for
this rulemaking.

Background

Transport Canada, which is the aviation authority for Canada, has
issued Transport Canada AD CF-2022-25, dated May 3, 2022 (Transport
Canada AD CF-2022-25) (also referred to after this as the MCAI), to
correct an unsafe condition on certain Bombardier, Inc., Model BD-700-
1A10 and BD-700-1A11 airplanes. The MCAI states that new or more
restrictive airworthiness limitations (life limits) for certain brake
accumulators have been developed, following in-service failures of
brake accumulators on other types of airplanes with similar components.
A brake accumulator surpassing a life limit could fail and result in
loss of hydraulic pressure on the associated hydraulic system, which
services the main and emergency/parking brakes on the main landing
gear. The unsafe condition, if not addressed, could result in reduced
or total loss of available braking and a possible runway excursion.
The FAA is proposing 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-2024-0228.

Related Service Information Under 1 CFR Part 51

The FAA reviewed the following Bombardier service information. This
service information specifies new or more restrictive airworthiness
limitations for the No. 2 and No. 3 brake accumulators having certain
part numbers. These documents are distinct since they apply to
different airplane configurations.
Section 5-10-11, ``Life Limits (Systems),'' of Part 2,
``Airworthiness Limitations,'' of the Bombardier Global 5000 Featuring
Global Vision Flight Deck Time Limits/Maintenance Checks (TLMC),
Publication No. GL 5000 GVFD TLMC, Revision 16, dated December 19,
2023, which includes Tasks 32-43-37-101, ``Discard the No. 2 Brake
Accumulator, Part No. GW415-1250-1'' and 32-44-05-101, ``Discard the
No. 3 Brake Accumulator, Part No. GW415-1200-1/-3.'' (For obtaining the
tasks for Bombardier Global 5000 Featuring GVFD TLMC, Publication No.
GL 5000 GVFD TLMC, use Document Identification No. GL 5000 GVFD TLMC.)
Section 5-10-11, ``Life Limits (Systems),'' of Part 2,
``Airworthiness Limitations,'' of the Bombardier Global 5000 Time
Limits/Maintenance Checks, Publication No. BD-700 TLMC, Revision 26,
dated December 19, 2023, which includes Tasks 32-43-37-101, ``Discard
the No. 2 Brake Accumulator, Part No. GW415-1250-1'' and 32-44-05-101,
``Discard the No. 3 Brake Accumulator, Part No. GW415-1200-1/-3.'' (For
obtaining the tasks for Bombardier Global 5000 TLMC, Publication No.
BD-700 TLMC, use Document Identification No. GL 5000 TLMC.)
Section 5-10-11, ``Life Limits (Systems),'' of Part 2,
``Airworthiness Limitations,'' of the Bombardier Global 6000 Time
Limits/Maintenance Checks, Publication No. GL 6000 TLMC, Revision 16,
dated December 19, 2023, which includes Tasks 32-43-37-101, ``Discard
the No. 2 Brake Accumulator, Part No. GW415-1250-1'' and 32-44-05-101,
``Discard the No. 3 Brake Accumulator, Part No. GW415-1200-1/-3.'' (For
obtaining the tasks for Bombardier Global 6000 TLMC, Publication No. GL
6000 TLMC, use Document Identification No. GL 6000 TLMC.)
Section 5-10-11, ``Life Limits (Systems),'' of Part 2,
``Airworthiness Limitations,'' of the Bombardier Global Express Time
Limits/Maintenance Checks, Publication No. BD-700 TLMC, Revision 35,
dated December 19, 2023, which includes Tasks 32-43-37-101, ``Discard
the No. 2 Brake Accumulator, Part No. GW415-1250-1'' and 32-44-05-101,
``Discard the No. 3 Brake Accumulator, Part No. GW415-1200-1/-3.'' (For
obtaining the tasks for Bombardier Global Express TLMC, Publication No.
BD-700 TLMC, use Document Identification No. GL 700 TLMC.)
Section 5-10-11, ``Life Limits (Systems),'' of Part 2,
``Airworthiness Limitations,'' of the Bombardier Global Express XRS
Time Limits/Maintenance Checks, Publication No. BD-700 XRS TLMC,
Revision 22, dated December 19, 2023, which includes Tasks 32-43-37-
101, ``Discard the No. 2 Brake Accumulator, Part No. GW415-1250-1'' and
32-44-05-101, ``Discard the No. 3 Brake Accumulator, Part No. GW415-
1200-1/-3.'' (For obtaining the tasks for Bombardier Global Express XRS
TLMC, Publication No. BD-700 XRS TLMC, use Document Identification No.
GL XRS TLMC.)
Section 5-10-11, ``Life Limits (Systems),'' of Part 2,
``Airworthiness Limitations,'' of the Bombardier Global 5500 Time
Limits/Maintenance Checks, Publication No. GL 5500 TLMC, Revision 5,
dated December 19, 2023, which includes Task 32-44-05-101, ``Discard
the No. 3 Brake Accumulator, Part No. GW415-1200-3.'' (For obtaining
the task for Bombardier Global 5500 TLMC, Publication No. GL 5500 TLMC,
use Document Identification No. GL 5500 TLMC.)
Section 5-10-11, ``Life Limits (Systems),'' of Part 2,
``Airworthiness Limitations,'' of the Bombardier Global 6500 Time
Limits/Maintenance Checks, Publication No. GL 6500 TLMC, Revision 5,
dated December 19, 2023, which includes Task 32-44-05-101, ``Discard
the No. 3 Brake Accumulator, Part No. GW415-1200-3.'' (For obtaining
the task for Bombardier Global 6500 TLMC, Publication No. GL 6500 TLMC,
use Document Identification No. GL 6500 TLMC.)
The FAA also reviewed the following service information, which
specifies procedures for determining the accumulated landings on the
brake accumulators. Knowing the accumulated landings is necessary to
comply with the life limit. These documents are distinct because they
apply to different airplane configurations.
Bombardier Service Bulletin 700-1A11-32-030, Revision 02,
dated March 2, 2023.
Bombardier Service Bulletin 700-32-043, Revision 02, dated
March 2, 2023.
Bombardier Service Bulletin 700-32-5020, Revision 02,
dated March 2, 2023.
Bombardier Service Bulletin 700-32-5506, Revision 02,
dated March 2, 2023.
Bombardier Service Bulletin 700-32-6020, Revision 02,
dated March 2, 2023.
Bombardier Service Bulletin 700-32-6506, Revision 02,
dated March 2, 2023.
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 ADDRESSES.

FAA's Determination

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,
the FAA has been notified of the unsafe condition described in the MCAI
and service information referenced above. The FAA is proposing this AD
because the FAA evaluated all the relevant information and determined
the unsafe condition described previously is likely to exist or develop
on other products of the same type design.

Proposed Requirements of This NPRM

This proposed AD would require revising the existing maintenance or
inspection program, as applicable, to incorporate new or more
restrictive airworthiness limitations for certain brake accumulators.
This proposed AD also would require determining the accumulated
landings on the affected brake accumulators.
This proposed AD would require revisions to certain operator
maintenance documents to include new actions (e.g., inspections).
Compliance with these actions is required by 14 CFR 91.403(c). For
airplanes that have been previously modified, altered, or repaired in
the areas addressed by this proposed AD, the operator may not be able
to accomplish the actions described in the revisions. In this
situation, to comply with 14 CFR 91.403(c), the operator must request
approval for an alternative method of compliance according to paragraph
(k)(1) of this proposed AD.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 117 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed 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).

Estimated Costs for Required Actions

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

The FAA determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would 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 proposed
regulation:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Would not affect intrastate aviation in Alaska, and
(3) Would 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 Proposed Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 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: