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2018-11-12 BOMBARDIER, INC., AIRPLANES:
Amendment 39-19300; Docket No. FAA-2017-1175; Product Identifier 2017-NM-087-AD.

(a) EFFECTIVE DATE

    This AD is effective July 12, 2018.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to  all Bombardier, Inc., Model  CL-600-2C10 (Regional
    Jet Series 700, 701, & 702) airplanes, Model CL-600-2D15 (Regional Jet
    Series 705)  airplanes,  Model  CL-600-2D24  (Regional Jet Series 900)
    airplanes, and Model CL-600-2E25 (Regional Jet Series 1000) airplanes,
    certificated in any category.

(d) SUBJECT

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

(e) REASON

    This AD was  prompted by a  report indicating that  Belleville washers
    installed on the shimmy damper of the main landing gear (MLG) may fail
    due to  fatigue. We  are issuing  this AD  to prevent  a failed washer
    segment migrating into the  piston cavity and interfering  with piston
    travel.  As  a  result,   the  shimmy  damper  performance   could  be
    compromised, and an MLG shimmy could occur, potentially leading to  an
    MLG failure and affecting the airplane's safe flight and landing.

(f) COMPLIANCE

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

(g) MAINTENANCE OR INSPECTION PROGRAM REVISION

    Within 30 days after the effective date of this AD,  revise  the  air-
    plane maintenance or inspection program, as applicable, by incorporat-
    ing maintenance review board  (MRB)  report  task  number  320100-229,
    Restoration (Belleville Washer Replacement) of the  MLG Shimmy Damper,
    of  the  MRB  Report  of  the  Bombardier CRJ700/900/1000  Maintenance
    Requirements Manual (MRM)-Part 1,  Volume 1,  CSP B-053,  Revision 17,
    dated June 25, 2017.  The initial compliance time  for MRB report task
    number 320100-229 is specified in paragraphs (g)(1) and (g)(2) of this
    AD, as applicable.

(1) For any shimmy damper  with 20,000 total accumulated  flight cycles or
    fewer as of the effective date of this AD, the initial compliance time
    is before the accumulation of 26,000 total flight cycles.

(2) For any shimmy damper  with 20,000 total accumulated  flight cycles or
    more as of the effective date of this AD,  the initial compliance time
    is specified  in paragraph (g)(2)(i) or (g)(2)(ii),  whichever  occurs
    later.

(i) Within 6,000 flight cycles  after  the  effective date of this AD, but
    prior to the accumulation of 30,000 total flight cycles.

(ii) Within 30 days after effective date of this AD.

(h) 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 Temporary Revision MRB-0070, dated October
    20, 2015.

(i) NO ALTERNATIVE ACTIONS AND/OR INTERVALS

    After the airplane maintenance or inspection program has been revised,
    as required by paragraph (g) of this AD, no alternative actions (e.g.,
    inspections) and/or intervals  may be used  unless the actions  and/or
    intervals are approved as  an alternative method of  compliance (AMOC)
    in accordance  with the  procedures specified  in paragraph  (j)(1) of
    this AD.

(j) OTHER FAA AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager,  New York ACO
    Branch,  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 certification office,  send
    it to ATTN: Program  Manager, Continuing Operational Safety,  FAA, New
    York ACO Branch, 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
    Branch, FAA; or Transport Canada Civil Aviation (TCCA); or  Bombardier
    Inc.'s 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-2017-14, dated April 21, 2017, for
    related information. This MCAI  may be found in  the AD docket on  the
    internet at http://www.regulations.gov  by searching for  and locating
    Docket No. FAA-2017-1175.

(2) For more information  about this AD,  contact  Cesar Gomez,  Aerospace
    Engineer,  Airframe and Mechanical Systems Section,  FAA, New York ACO
    Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;  telephone
    516-228-7318; 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) Maintenance  review  board  (MRB)   report   task  number  320100-229,
    Restoration (Belleville Washer Replacement)  of the MLG Shimmy Damper,
    of  the  MRB Report of the Bombardier CRJ700/900/1000  Maintenance Re-
    quirements Manual (MRM)-Part 1, Volume 1, CSP B-053, Revision 17 dated
    June 25, 2017.

(ii) Reserved.

(3) For service information identified  in  this  AD,  contact Bombardier,
    Inc., 400 Cote-Vertu Road West, Dorval, Quebec H4S 1Y9, Canada;  Wide-
    body Customer Response Center North America toll-free telephone 1-866-
    538-1247 or direct-dial telephone 1-514-855-2999; fax 514-855-7401; e-
    mail ac.yul@aero.bombardier.com; internet http://www.bombardier.com.

(4) 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.

(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 Des Moines, Washington on May 21, 2018. James Cashdollar, Acting
Director, System Oversight Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT: Cesar Gomez, Aerospace Engineer, Airframe
and Mechanical Systems Section, FAA New York ACO Branch, 1600 Stewart Ave-
nue, Suite 410, Westbury, NY 11590;  telephone 516-228-7318;  fax 516-794-
5531.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-1175; Product Identifier 2017-NM-087-AD; Amendment
39-19300; AD 2018-11-12]
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 all
Bombardier, Inc., Model CL-600-2C10 (Regional Jet Series 700, 701, &
702) airplanes, Model CL-600-2D15 (Regional Jet Series 705) airplanes,
Model CL-600-2D24 (Regional Jet Series 900) airplanes, and Model CL-
600-2E25 (Regional Jet Series 1000) airplanes. This AD was prompted by
a report that Belleville washers installed on the shimmy damper of the
main landing gear (MLG) may fail due to fatigue. This AD requires
revising the maintenance or inspection program, as applicable, to
incorporate a repetitive task specified in the maintenance review board
(MRB) report. We are issuing this AD to address the unsafe condition on
these products.

DATES: This AD is effective July 12, 2018.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of July 12,
2018.

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 ac.yul@aero.bombardier.com;
internet http://www.bombardier.com. You may view this referenced
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-2017-1175.

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-
1175; 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: Cesar Gomez, Aerospace Engineer,
Airframe and Mechanical Systems Section, FAA, New York ACO Branch, 1600
Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7318;
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 all Bombardier, Inc., Model
CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes, Model CL-
600-2D15 (Regional Jet Series 705) airplanes, Model CL-600-2D24
(Regional Jet Series 900) airplanes, and Model CL-600-2E25 (Regional
Jet Series 1000) airplanes. The NPRM published in the Federal Register
on January 2, 2018 (83 FR 83) (``the NPRM'').
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian AD CF-2017-14, dated April
21, 2017 (referred to after this as the Mandatory Continuing
Airworthiness Information, or ``the MCAI''), to correct an unsafe
condition for all Bombardier, Inc., Model CL-600-2C10 (Regional Jet
Series 700, 701, & 702) airplanes, Model CL-600-2D15 (Regional Jet
Series 705) airplanes, Model CL-600-2D24 (Regional Jet Series 900)
airplanes, and Model CL-600-2E25 (Regional Jet Series 1000) airplanes.
The MCAI states:

It has been found that Belleville washers installed on the Main
Landing Gear (MLG) Shimmy Damper may fail in fatigue. A failed
washer segment migrating into the piston cavity may interfere with
piston travel. As a result, shimmy damper performance would be
compromised, MLG shimmy could occur and potentially lead to a MLG
failure.
As a result of this investigation, a restoration task has been
added for Belleville washers' replacement at 20,000 flight cycles,
during MLG overhaul. For aeroplanes that have passed the 20,000
flight cycle threshold, a phase-in period is defined.
This [Canadian] AD is issued to mandate the Maintenance Review
Board (MRB) revised task for the affected aeroplanes models.

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-
1175.

Comments

We gave the public the opportunity to participate in developing
this AD. The following presents the comment received on the NPRM and
the FAA's response to that comment.

Request to the Contact Manufacturer for Service Information

Bombardier stated that task number 320100-229, Restoration
(Belleville Washer Replacement) of the MLG Shimmy Damper, of the MRB
Report of the Bombardier CRJ700/900/1000 Maintenance Requirements
Manual (MRM)--Part 1, Volume 1, CSP B-053, Revision 17, dated June 25,
2017, is currently specified in paragraph (g) of the proposed AD.
Bombardier commented that it is planning to issue Revision 18 of the
service information by June 25, 2018. Bombardier stated to contact
Bombardier for the latest service information should the AD be
published after June 25, 2018.
We expect to issue this AD prior to the anticipated date of release
of new service information, and we do not agree to delay issuance of
this AD until new service information is released. However, if new
service information is released after this AD is issued, operators may
request approval of an alternative method of compliance (AMOC) under
the provisions of paragraph (j)(1) of this AD. We have not changed this
AD regarding this issue.

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 has issued MRB report task number 320100-229,
Restoration (Belleville Washer Replacement) of the MLG Shimmy Damper,
of the MRB Report of the Bombardier CRJ700/900/1000 Maintenance
Requirements Manual (MRM)--Part 1, Volume 1, CSP B-053, Revision 17,
dated June 25, 2017. This service information describes the restoration
(Belleville Washer Replacement) of the MLG shimmy damper. 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 544 airplanes of U.S. registry.
We estimate the following costs to comply with this AD:
We have determined that revising the maintenance or inspection
program takes an average of 90 work-hours per operator, although we
recognize that this number may vary from operator to operator. In the
past, we have estimated that this action takes 1 work-hour per
airplane. Since operators incorporate maintenance or inspection program
changes for their affected fleet(s), we have determined that a per-
operator estimate is more accurate than a per-airplane estimate.
Therefore, we estimate the total cost per operator to be $7,650 (90
work-hours x $85 per work-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
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):