DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2019-0024; Product Identifier 2018-NM-138-AD; Amendment
39-19640; AD 2019-10-01]
Airworthiness Directives; Bombardier, Inc., Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
ACTION: Final rule.
SUMMARY: We are adopting a new airworthiness directive (AD) for
Bombardier, Inc., Model CL-600-2A12 (601) airplanes. This AD was
prompted by a report of damage to the anti-rotation tab on a main
landing gear (MLG) side brace fitting due to the installation of an
incorrect side brace fitting shaft. This AD requires an inspection of
the MLG side brace fitting for damage, a verification of the side brace
fitting shaft part number, and replacement of the side brace fitting
shaft if necessary. It also requires the installation of an anti-
rotation bracket. We are issuing this AD to address the unsafe
condition on these products.
DATES: This AD is effective July 18, 2019.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of July 18,
ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 200 Cote-Vertu Road West, Dorval,
Quebec H4S 2A3, Canada; North America toll-free telephone 1-866-
538-1247 or direct-dial telephone 1-514-855-2999; email
firstname.lastname@example.org; internet http://www.bombardier.com. You may
view this service information at the FAA, Transport Standards 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 on the internet at http://www.regulations.gov by searching
for and locating Docket No. FAA-2019-0024.
Examining the AD Docket
You may examine the AD docket on the internet at http://www.regulations.gov
by searching for and locating Docket No. FAA-2019-0024;
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 regulatory evaluation, any comments received, and
other information. The address for Docket Operations (phone: 800-647-
5527) 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.
FOR FURTHER INFORMATION CONTACT: Aziz Ahmed, Aerospace Engineer,
New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, New York
11590; telephone: 516-287-7329; fax: 516-794-5531; email:
We 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 CL-600-2A12 (601) airplanes. The NPRM published in the Federal
Register on February 28, 2019 (84 FR 6705). The NPRM was prompted by a
report of damage to the anti-rotation tab on an MLG side brace fitting
due to the installation of an incorrect side brace fitting shaft. The
NPRM proposed to require an inspection of the MLG side brace fitting
for damage, a verification of the side brace fitting shaft part number,
and replacement of the side brace fitting shaft if necessary. It also
proposed to require the installation of an anti-rotation bracket.
We are issuing this AD to address premature cracking of the MLG
side brace fitting. This condition, if not corrected, could lead to the
collapse of the MLG, resulting in structural damage to the wing spar
and fuel tank.
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian AD CF-2018-19, dated July 20,
2018 (referred to after this as the Mandatory Continuing Airworthiness
Information, or ``the MCAI''), to correct an unsafe condition for
certain Bombardier, Inc., Model CL-600-2A12 (601) airplanes. The MCAI
There has been a report of damage to the anti-rotation tab on a
Main Landing Gear (MLG) Side Brace fitting. Investigation of the
report revealed that a Challenger model CL600 MLG Side Brace shaft
had been installed on a Challenger model CL601 Side Brace fitting.
Due to the difference in size, this will result in changes to the
way the load is transferred between the shaft and the MLG Side Brace
fitting and may result in premature cracking of the MLG Side Brace
fitting. This condition, if not corrected, could lead to the
collapse of the MLG resulting in structural damage to the wing spar
and fuel tank.
This [Canadian] AD mandates an inspection of the MLG Side Brace
fitting and shaft to verify that the correct shaft part number (P/N)
is installed and the fitting is not damaged [damage includes
cracking, scratches, gouges, corrosion, defects, and incorrect inner
diameter tolerance]. If the Challenger CL600 shaft is installed,
this AD mandates replacement with the correct Challenger model CL601
part. If the correct P/N is found installed, this [Canadian] AD also
mandates the installation of a bracket to prevent the incorrect part
from being installed in the future.
You may examine the MCAI in the AD docket on the internet at http://
www.regulations.gov by searching for and locating Docket No. FAA-2019-
We gave the public the opportunity to participate in developing
this final rule. We received no comments on the NPRM or on the
determination of the cost to the public.
We reviewed the relevant data and determined that air safety and
the public interest require adopting this final rule as proposed,
except for minor editorial changes. We have determined that these minor
Are consistent with the intent that was proposed in the
NPRM for addressing the unsafe condition; and
Do not add any additional burden upon the public than was
already proposed in the NPRM.
Related Service Information Under 1 CFR Part 51
Bombardier has issued Service Bulletin 601-0624, Revision 02, dated
January 29, 2018. This service information describes procedures for
inspecting the MLG side brace fitting and side brace fitting shaft,
installing a replacement side brace fitting shaft if necessary, and
installing an anti-rotation bracket.
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
We estimate that this AD affects 9 airplanes of U.S. registry. We
estimate the following costs to comply with this AD:
Estimated Costs for Required Actions
|4 work-hours x $85 per hour =
We estimate the following costs to
do any necessary on-condition
actions that would be required based on the results of any required
actions. We have no way of determining the number of aircraft that
might need these on-condition actions:
Estimated Costs of On-Condition Actions
|8 work-hours x $85 per 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.
We are 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
This AD is issued in accordance with authority delegated by the
Executive Director, Aircraft Certification Service, as authorized by
FAA Order 8000.51C. In accordance with that order, issuance of ADs is
normally a function of the Compliance and Airworthiness Division, but
during this transition period, the Executive Director has delegated the
authority to issue ADs applicable to transport category airplanes and
associated appliances to the Director of the System Oversight Division.
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) Is not a ``significant rule'' under the DOT Regulatory Policies
and Procedures (44 FR 11034, February 26, 1979),
(3) Will not affect intrastate aviation in Alaska, and
(4) 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
Adoption of 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