DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2019-0186; Product Identifier 2018-NM-153-AD; Amendment
39-19694; AD 2019-15-01]
Airworthiness Directives; Bombardier, Inc., Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
ACTION: Final rule.
SUMMARY: The FAA is adopting a new airworthiness directive (AD)
Bombardier, Inc., Model CL-600-2B16 (601-3A, 601-3R, and 604 Variants)
airplanes. This AD was prompted by a report that main landing gear
(MLG) side stay actuators have been assembled using nonconforming split
ball bearings. This AD requires verification of the serial numbers of
the installed MLG side stay actuator assemblies, and replacement of the
affected parts. The FAA is issuing this AD to address the unsafe
condition on these products.
DATES: This AD is effective September 19, 2019.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of September 19,
ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 400 Cote-Vertu Road West, Dorval,
Quebec H4S 1Y9, Canada; Widebody Customer Response Center North
America toll-free telephone 1-866-538-1247 or direct-dial telephone 1-
514-855-2999; fax 514-855-7401; email email@example.com;
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-2019-0186.
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-
0186; 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
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.
FOR FURTHER INFORMATION CONTACT: Darren Gassetto, Aerospace Engineer,
Mechanical Systems and Administrative Services Section, FAA, New York
ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7323; fax 516-794-5531; 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 all Bombardier, Inc.,
Model CL-600-2B16 (601-3A, 601-3R, and 604 Variants) airplanes. The
NPRM published in the Federal Register on May 14, 2019 (84 FR 21273).
The NPRM was prompted by a report that MLG side stay actuators have
been assembled using nonconforming split ball bearings. The NPRM
proposed to require verification of the serial numbers of the installed
MLG side stay actuator assemblies, and replacement of the affected
The FAA is issuing this AD to address the affected bearings, which
could potentially result in asymmetric MLG gear extension or
retraction, and subsequent gear collapse during landing.
In the NPRM, the FAA referred to Canadian AD CF-2018-26, dated
October 5, 2018. However, since the NPRM was issued, Transport Canada
Civil Aviation (TCCA), the civil aviation authority for Canada, issued
Canadian AD CF-2018-26R1, dated May 22, 2019 (referred to after this as
the Mandatory Continuing Airworthiness Information, or ``the MCAI''),
to correct an unsafe condition for certain Bombardier, Inc., Model CL-
600-2B16 (601-3A, 601-3R, and 604 Variants) airplanes. The MCAI states:
The landing gear supplier has informed Bombardier Inc. about a
quality escape involving Main Landing Gear (MLG) side stay actuators
that have been assembled using non-conforming split ball bearings.
The affected bearings are manufactured from material that does not
meet the required material properties. If not corrected, this
condition can result in potentially asymmetric MLG gear extension or
retraction and subsequent gear collapse during landing.
The original version of this [Canadian] AD mandated . . .
verification of the installed MLG side stay actuator assemblies and
replacement of the affected parts.
Revision 1 of this [Canadian] AD is issued to add a reference to
Table 2 in the applicable Service Bulletins (SBs) that list affected
serial numbers for P/N 19011-105.
The FAA has determined that the revised MCAI has no effect on
airplanes on which the actions identified in the NPRM were completed.
The FAA has revised paragraph (l)(1) of this AD to refer to Canadian AD
CF-2018-26R1, dated May 22, 2019.
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-2019-0186.
The FAA gave the public the opportunity to participate in
developing this final rule. The FAA received no comments on the NPRM or
on the determination of the cost to the public.
The FAA reviewed the relevant data and determined that air safety
and the public interest require adopting this final rule with the
change described previously and minor editorial changes. The FAA has
determined that these minor changes:
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.
The FAA also determined that this change will not increase the
economic burden on any operator or increase the scope of this final
Related Service Information Under 1 CFR Part 51
Bombardier has issued the following service information.
Bombardier Service Bulletin 604-32-029, Revision 02, dated
May 10, 2018.
Bombardier Service Bulletin 605-32-006, Revision 02, dated
May 10, 2018.
Bombardier Service Bulletin 650-32-002, Revision 02, dated
May 10, 2018.
The service information describes procedures to verify the serial
numbers of the installed MLG side stay actuator assemblies and to
replace the affected parts. These documents are distinct since they
apply to the airplane model in different configurations.
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 384 airplanes of U.S.
registry. The agency estimates the following costs to comply with this
Estimated Costs for Required Actions
|1 work-hour x $85 per hour =
The FAA estimates the following costs
to do any necessary on-
condition action that would be required based on the results of any
required actions. The agency has no way of determining the number of
aircraft that might need this on-condition action:
Estimated Costs of On-Condition Actions
|Up to 7 work-hours x $85 per
hour = Up to $595
Up to $1,820
Up to $2,415
According to the manufacturer, some
or all of the costs of this AD
may be covered under warranty, thereby reducing the cost impact on
affected individuals. The FAA does not control warranty coverage for
affected individuals. As a result, the agency has included all known
costs in its cost estimate.
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
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) 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
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