DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0511; Product Identifier 2016-NM-176-AD; Amendment
39-19036; AD 2017-19-06]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).

ACTION: Final rule.

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SUMMARY: We are adopting a new airworthiness directive (AD) for certain
Bombardier, Inc. Model CL-600-1A11 (CL-600), CL-600-2A12 (CL-601
Variant), and CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604 Variants)
airplanes. This AD was prompted by a new life limitation that has been
introduced for the side brace fitting shaft and side brace-to-airplane
fitting pin of the main landing gear (MLG). This AD requires revising
the maintenance or inspection program. This AD also requires an
inspection to identify the serial number, to serialize, and to record
the accumulated life of the side brace fitting shaft of the MLG. We are
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective October 27, 2017.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of October 27,
2017.

ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 400 C[ocirc]te-Vertu Road West, Dorval,
Qu[eacute]bec 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 ac.yul@aero.bombardier.com;
Internet http://www.bombardier.com. You may view this referenced
service information at the FAA, Transport Standards Branch, 1601 Lind
Avenue SW., Renton, WA. For information on the availability of this
material at the FAA, call 425-227-1221. It is also available on the
Internet at http://www.regulations.gov by searching for and locating
Docket No. FAA-2017-0511.

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-2017-
0511; or in person at the Docket Management Facility between 9 a.m. and
5 p.m., Monday through Friday, except Federal holidays. The AD docket
contains this AD, the regulatory evaluation, any comments received, and
other information. The street address for the Docket Office (telephone
800-647-5527) is Docket Management Facility, 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,
Airframe and Mechanical Systems Section, FAA, New York ACO Branch, 1600
Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7329;
fax 516-794-5531.

SUPPLEMENTARY INFORMATION:

Discussion

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-600-1A11 (CL-600), CL-600-2A12 (CL-601 Variant), and CL-600-
2B16 (CL-601-3A, CL-601-3R, and CL-604 Variants) airplanes. The NPRM
published in the Federal Register on June 7, 2017 (82 FR 26403) (``the
NPRM'').
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian Airworthiness Directive CF-
2016-17R2, dated June 29, 2016 (referred to after this as the Mandatory
Continuing Airworthiness Information, or ``the
MCAI''), to correct an unsafe condition for certain Bombardier, Inc.,
Model CL-600-1A11 (CL-600), CL-600-2A12 (CL-601 Variant), and CL-600-
2B16 (CL-601-3A, CL-601-3R, and CL-604 Variants) airplanes. The MCAI
states:

Based on in-service experience, a new life limitation has been
introduced for the following side brace fitting shaft part numbers:
600-10237-1/-5
600-10237-3
601R10237-1/-3
In order to facilitate identification and tracking, the
component must be identified and serialized. Bombardier has revised
the Time Limits/Maintenance Checks (TLMC) Manual to include new life
limits and issued Service Bulletins (SB) for serialization of the
affected parts.
The original version of this [Canadian] AD was issued to mandate
the incorporation of the new TLMC life limits as well as
identification and serialization of the affected parts. The revision
1 of this [Canadian] AD was issued * * * June [10,] 2016 to correct
a typographic error in Table A of the Corrective Actions section.
The revision 2 of this [Canadian] AD is being issued to correct/
update the TLMC data in Table A of the Corrective Actions section.

Required actions include an inspection to identify the serial
number, to serialize, and to record the accumulated life of the side
brace fitting shaft of the MLG. The unsafe condition is the loss of
structural integrity of the affected part. 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-2017-0511.

Comments

We gave the public the opportunity to participate in developing
this AD. We received no comments on the NPRM or on the determination of
the cost to the public.

Conclusion

We reviewed the relevant data and determined that air safety and
the public interest require adopting this AD as proposed except for
minor editorial changes. We have determined that these minor changes:
Are consistent with the intent that was proposed in the
NPRM for correcting 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

We have reviewed the following service information. This service
information describes the life limits for the side brace fitting shaft
and side brace-to-airplane fitting pin of the MLG. This service
information is distinct since it applies to different airplane models
in different configurations.
Section 5-10-10, Time Limits (Structural), of the
Airworthiness Limitations, of the Bombardier Challenger 600 Time
Limits/Maintenance Checks Manual, Publication No. PSP 605, Revision 37,
dated April 29, 2016.
Section 5-10-10, Time Limits (Structural)--Pre SB 601-
0280, of the Airworthiness Limitations, of the Bombardier Challenger
601 Time Limits/Maintenance Checks Manual, Publication No. PSP 601-5,
Revision 42, dated April 22, 2014.
Section 5-10-10, Time Limits (Structural), of the
Airworthiness Limitations, of the Bombardier Challenger 601 Time
Limits/Maintenance Checks Manual, Publication No. PSP 601A-5, Revision
38, dated April 22, 2014.
Section 5-10-10, Life Limits (Structures), of Part 2,
Airworthiness Limitations, of the Bombardier Challenger CL-604 Time
Limits/Maintenance Checks Manual, Publication No. CH 604 TLMC, Revision
26, dated June 9, 2016.
Section 5-10-10, Life Limits (Structures) to Part 2,
Airworthiness Limitations, of the Bombardier Challenger CL-605 Time
Limits/Maintenance Checks Manual, Publication No. CH 605 TLMC, Revision
14, dated June 9, 2016.
We have also reviewed the following service information. This
service information describes procedures for an inspection to identify
the serial number, to serialize, and to record the accumulated life of
the side brace fitting shaft of the MLG. The service bulletins are
distinct since they apply to different airplane models.
Bombardier Service Bulletin 600-0768, dated September 9,
2014.
Bombardier Service Bulletin 601-0636, Revision 01, dated
May 10, 2016.
Bombardier Service Bulletin 604-57-005, dated September 9,
2014.
Bombardier Service Bulletin 605-57-003, dated September 9,
2014.
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 133 airplanes of U.S. registry.
We estimate the following costs to comply with this AD:

Estimated Costs

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
rulemaking action.
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 to
the Director of the System Oversight Division.

Regulatory Findings

We determined that 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. 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
reference, Safety.

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
directive (AD):