DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2023-1493; Project Identifier MCAI-2022-01105-T;
Amendment 39-22569; AD 2023-20-10]
Airworthiness Directives; Bombardier, Inc., Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
SUMMARY: The FAA is adopting a new airworthiness directive (AD)
certain Bombardier, Inc., Model BD-700-2A12 airplanes. This AD was
prompted by a report that some of the multi-function spoiler (MFS)
anti-rotation plates failed in-service due to a thin wall design. This
AD requires replacing the MFS anti-rotation plates, inspecting the MFS
anti-rotation plates for cracking and hinge bolts for evidence of
rotation, accomplishing applicable corrective actions, and performing
functional test of the MFS control surfaces. The FAA is issuing this AD
to address the unsafe condition on these products.
DATES: This AD is effective November 21, 2023.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of November 21,
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2023-1493; 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 service information identified in this final rule,
contact Bombardier Business Aircraft Customer Response Center, 400
Cote-Vertu Road West, Dorval, Quebec H4S 1Y9, Canada;
telephone 514-855-2999; email email@example.com; website
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. It is also available at
regulations.gov under Docket No. FAA-2023-1493.
FOR FURTHER INFORMATION CONTACT: Yaser Osman, Aviation Safety Engineer,
FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-
228-7300; email firstname.lastname@example.org.
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain serial-numbered
Bombardier, Inc., Model BD-700-2A12 airplanes. The NPRM published in
the Federal Register on July 14, 2023 (88 FR 45121). The NPRM was
prompted by AD CF-2022-47R1, dated October 11, 2022, issued by
Transport Canada, which is the aviation authority for Canada (referred
to after this as ``the MCAI''). The MCAI states that a report was
received that some of the MFS anti-rotation plates failed in-service
due to a thin wall design. The MFS anti-rotation plates were designed
with overlapping tolerances on the inside and outside diameters, which
allows for an extremely thin wall thickness once machined.
In the NPRM, the FAA proposed to require replacing the MFS anti-
rotation plates, inspecting the MFS anti-rotation plates for cracking
and hinge bolts for evidence of rotation, accomplishing applicable
corrective actions, and performing a functional test of the MFS control
surfaces. The FAA is issuing this AD to address MFS anti-rotation plate
failures. The unsafe condition, if not addressed, could result in wear
and failure of the inboard and outboard spoiler hinge pins, possibly
resulting in a hinge no longer supporting the load, or unintended
asymmetrical spoiler deployment, leading to reduced controllability of
the airplane, or loss of control of the airplane.
You may examine the MCAI in the AD docket at regulations.gov under
Docket No. FAA-2023-1493.
Discussion of Final Airworthiness Directive
The FAA received no comments on the NPRM or on the determination of
the cost to the public.
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. This AD is adopted as proposed in the
Related Service Information Under 1 CFR Part 51
The FAA reviewed Bombardier Service Bulletin 700-27-7504, Revision
01, dated July 11, 2022. This service information specifies procedures
for replacing the left and right MFS No. 1, MFS No. 2, and MFS No. 3
anti-rotation plate part number (P/N) G05770140-103 and P/N G05770160-
101 with P/N G05770140-105. In addition, one of the procedural steps is
to inspect the MFS anti-rotation plates for cracking and the hinge bolt
for any evidence of rotation, and repair or replacement. This service
information also specifies procedures for performing a functional test
(stop-to-stop check) of the MFS control-surfaces.
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 42 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs for Required Actions
|3 work-hours x $85 per hour =
The FAA has received no definitive
data on which to base the cost
estimates for the on-condition repairs or replacements specified in
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.
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
(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
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