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2017-15-11 BOMBARDIER, INC.: Amendment 39-18971; Docket No. FAA-2017-0331; Directorate Identifier 2016-NM-213-AD.
(a) EFFECTIVE DATE

    This AD is effective September 5, 2017.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to Bombardier, Inc. Model DHC-8-102, -103, -106, -201,
    -202, -301, -311, and -315 airplanes,  certificated  in  any category,
    serial numbers 003 through 672 inclusive,  equipped with  main landing
    gear (MLG) retraction actuator assembly part number 10500-101, -103,
    -501, -551, or -553.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 32, Landing Gear.

(e) REASON

    This AD was  prompted by reports of undamped MLG extension in-service.
    We are issuing this AD to prevent MLG undamped extensions, which could
    result  in  MLG structural failure,  resulting in an unsafe asymmetric
    landing gear configuration.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) REPLACEMENT OF MLG RETRACTION ACTUATOR ROD-ENDS

    At the applicable time specified in paragraph (g)(1) or (g)(2) of this
    AD:  Replace  the  MLG  retraction  actuator  rod-ends  on  both   MLG
    assemblies,  in  accordance with  the  Accomplishment Instructions  of
    Bombardier Service Bulletin 8-32-179, Revision A, dated March 9, 2017.

(1) For MLG retraction actuator assemblies with 37,000 total flight cycles
    or more as of the effective date of this AD: Within 18 months or 2,700
    flight cycles, whichever occurs first after the effective date of this
    AD.

(2) For  MLG retraction actuator assemblies  with  fewer than 37,000 total
    flight cycles as of the effective date of this AD: Within 24 months or
    3,600 flight cycles,  whichever occurs first  after the effective date
    of this AD.

(h) ALTERNATIVE INSTALLATION OF PART NUMBER (P/N) 10500-105, -503, OR -555

    Installation of MLG retraction actuator assembly  P/N 10500-105, -503,
    or -555 on both MLGs is acceptable for compliance with the replacement
    required by paragraph (g) of this AD.

(i) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit for actions required  by  paragraph (g)
    of this AD,  if those actions were performed before the effective date
    of this AD using Bombardier Service Bulletin 8-32-179,  dated July 10,
    2015.

(j) OTHER FAA AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager, New York Air-
    craft Certification Office (ACO),  ANE-170, FAA, has the  authority to
    approve AMOCs for this AD, if requested using the procedures found  in
    14 CFR 39.19. In  accordance with 14 CFR  39.19, send your request  to
    your principal inspector or local Flight Standards District Office, as
    appropriate. If  sending information  directly to  the manager  of the
    ACO, send it to ATTN: Program Manager, Continuing Operational  Safety,
    FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
    telephone 516-228-7300;  fax 516-794-5531.  Before using  any approved
    AMOC,  notify  your  appropriate  principal  inspector,  or  lacking a
    principal  inspector,  the  manager  of  the  local  flight  standards
    district office/certificate holding district office.

(2) Contacting the Manufacturer:  For any requirement in this AD to obtain
    corrective actions from a manufacturer the action must be accomplished
    using a method approved by the Manager, New York ACO, ANE-170, FAA; or
    Transport Canada Civil Aviation  (TCCA);  or  Bombardier, Inc.ís  TCCA
    Design Approval Organization (DAO). If approved by the DAO, the
    approval must include the DAO-authorized signature.

(k) RELATED INFORMATION

(1) Refer   to   Mandatory  Continuing  Airworthiness  Information  (MCAI)
    Canadian Airworthiness Directive CF-2016-36,  dated November 22, 2016,
    for  related  information.  This MCAI may be found in the AD docket on
    the Internet at http://www.regulations.gov by searching for and locat-
    ing Docket No. FAA-2017-0331.

(2) For more information about this AD,  contact Fabio Buttitta, Aerospace
    Engineer,  Airframe and Mechanical Systems Branch,  ANE-171,  FAA, New
    York ACO,  1600 Stewart Avenue,  Suite 410, Westbury, NY 11590;  tele-
    phone 516-228-7303; fax 516-794-5531.

(3) Service information  identified in this AD that is not incorporated by
    reference is available at the addresses specified in paragraphs (l)(3)
    and (l)(4) of this AD.

(l) MATERIAL INCORPORATED BY REFERENCE

(1) The  Director  of  the  Federal Register approved the incorporation by
    reference  (IBR)  of  the service information listed in this paragraph
    under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must  use this service information as applicable to do the actions
    required by this AD, unless this AD specifies otherwise.

(i) Bombardier Service Bulletin 8-32-179, Revision A, dated March 9, 2017.

(ii) Reserved.

(3) For  service information identified  in this AD,  contact  Bombardier,
    Inc.,  Q-Series Technical Help Desk,  123 Garratt Boulevard,  Toronto,
    Ontario M3K 1Y5, Canada;  telephone  416-375-4000;  fax  416-375-4539;
    email thd.qseries@aero.bombardier.com; Internet http://www.bombardier.
    com.

(4) You may view this service information at the FAA,  Transport  Airplane
    Directorate, 1601 Lind Avenue SW., Renton, WA.  For information on the
    availability of this material at the FAA, call 425-227-1221.

(5) You  may  view  this  service  information  that  is  incorporated  by
    reference at  the National Archives and Records Administration (NARA).
    For information on the availability of this material at NARA, call 202
    -741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-
    locations.html.

Issued  in  Renton, Washington,  on July 14, 2017.  Dionne Palermo, Acting
Manager, Transport Airplane Directorate, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT: Fabio Buttitta,  Aerospace Engineer, Air-
frame and Mechanical  Systems Branch,  ANE-171,  FAA,  New  York  Aircraft
Certification Office (ACO),  1600 Stewart Avenue,  Suite 410, Westbury, NY
11590; telephone 516-228-7303; fax 516-794-5531.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0331; Directorate Identifier 2016-NM-213-AD;
Amendment 39-18971; AD 2017-15-11]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

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

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: We are adopting a new airworthiness directive (AD) for certain
Bombardier, Inc., Model DHC-8-102, -103, -106, -201, -202, -301, -311,
and -315 airplanes. This AD was prompted by reports of undamped main
landing gear (MLG) extension in-service. This AD requires replacement
of the MLG retraction actuator rod-ends on both MLG assemblies. We are
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective September 5, 2017.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of September 5,
2017.

ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., Q-Series Technical Help Desk, 123 Garratt
Boulevard, Toronto, Ontario M3K 1Y5, Canada; telephone 416-375-4000;
fax 416-375-4539; email thd.qseries@aero.bombardier.com; Internet
http://www.bombardier.com. You may view this referenced service
information at the FAA, Transport Airplane Directorate, 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-2017-0331.

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-
0331; 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: Fabio Buttitta, Aerospace Engineer,
Airframe and Mechanical Systems Branch, ANE-171, FAA, New York Aircraft
Certification Office (ACO), 1600 Stewart Avenue, Suite 410, Westbury,
NY 11590; telephone 516-228-7303; 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 DHC-8-102, -103, -106, -201, -202, -301, -311, and -315
airplanes. The NPRM published in the Federal Register on May 2, 2017
(82 FR 20453) (``the NPRM''). The NPRM was prompted by reports of
undamped MLG extension in-service. The NPRM proposed to require
replacement of the MLG retraction actuator rod-ends on both MLG
assemblies. We are issuing this AD to prevent MLG undamped extensions,
which could result in MLG structural failure, resulting in an unsafe
asymmetric landing gear configuration.
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian Airworthiness Directive CF-
2016-36, dated November 22, 2016 (referred to after this as the
Mandatory Continuing Airworthiness Information, or ``the MCAI''), to
correct an unsafe condition for certain Bombardier, Inc., Model DHC-8-102,
-103, -106, -201, -202, -301, -311, and -315 airplanes. The MCAI states:

Two cases of undamped main landing gear (MLG) extension were
reported in-service. Investigation determined that the MLG
retraction actuator rod-ends failed as a result of non-conforming
threads. This condition, if not corrected, could lead to additional
MLG undamped extensions, which may result in MLG structural failure,
resulting in an unsafe asymmetric landing gear configuration.
This [Canadian] AD mandates the replacement of the MLG
retraction actuator rod-end subassemblies manufactured with non-
conforming threads with units that fully conform to the design
requirements.

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-
0331.

Comments

We gave the public the opportunity to participate in developing
this AD. We considered the comment received. Air Line Pilots
Association, International supported the NPRM.

Conclusion

We reviewed the relevant data, considered the comment received, 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


Bombardier, Inc., issued Service Bulletin 8-32-179, Revision A,
dated March 9, 2017. This service information describes procedures for
replacing the MLG retraction actuator rod-ends on both MLG assemblies
with units that fully conform to the design requirements. 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 91 airplanes of U.S. registry.
We estimate the following costs to comply with this AD:

Estimated Costs

Action Labor cost Parts cost Cost per product Cost on U.S. operators
Replacement 3 work-hours x $85 per hour = $255 $2,078 $2,333 $212,303

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.

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):