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2021-21-04 BOMBARDIER, INC.: Amendment 39-21764; Docket No. FAA-2021-0560; Project Identifier MCAI-2021-00192-T.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective December 8, 2021.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11
    airplanes, certificated in any  category, serial numbers 9002  through
    9879 inclusive,  9998, 60001  through 60005  inclusive, 60007,  60009,
    60015, 60016, and 60024.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 71, Powerplant.

(e) UNSAFE CONDITION

    This  AD was  prompted by  reports that  the sliding  bushings in  the
    forward engine mount system were  missing. The FAA is issuing  this AD
    to  address redistribution  of load/stress  on  the  mount components,
    which may decrease  the component fatigue  life; failure of  the mount
    structural  components  could  result  in  the  loss  of  the   engine
    attachment to the airframe.

(f) COMPLIANCE

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

(g) INSPECTION AND CORRECTIVE ACTION

    Within 15 months  or 750 flight  hours, whichever occurs  first, after
    the effective date of this  AD: Verify the proper installation  of the
    sliding bushings by doing an inspection (gap check) for  discrepancies
    of the front and aft engine mounts, in accordance with paragraphs 2.B.
    through  2.F.  of  the Accomplishment  Instructions of  the applicable
    service information specified in figure 1 to paragraph (g) of this AD.
    If any  discrepancy is  found: Before  further flight,  repair 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.  Where  a  serial  number  is
    identified in more than one row  in figure 1 to paragraph (g)  of this
    AD,  the applicable  service information  is identified  based on  the
    marketing  designations   in  paragraph   1.M.,  "Equivalent   Service
    Bulletins," of the service information.

                FIGURE 1 TO PARAGRAPH (G) – SERVICE INFORMATION           
    ______________________________________________________________________
    SERIAL NUMBERS–              MODEL–       BOMBARDIER SERVICE BULLETIN–
    ______________________________________________________________________
    9002 to 9312 inclusive,      BD-700-1A10   700-71-005, Revision 01,
    9314 to 9380 inclusive,      airplanes     dated April 16, 2021
    and 9384 to 9429 inclusive

    9313, 9381, 9432 to 9860     BD-700-1A10   700-71-6005, dated December
    inclusive, 9863 to 9871      airplanes     14, 2020
    inclusive, 9873 to 9879
    inclusive, 60005, and
    60024

    9861, 9872, 60001 to 60004   BD-700-1A10   700-71-6501, dated December
    inclusive, 60009, and 60016  airplanes     14, 2020

    9127 to 9383 inclusive,      BD-700-1A11   700-1A11-71-005, dated
    9389 to 9400 inclusive,      airplanes     December 14, 2020
    9404 to 9431 inclusive,
    and 9998

    9386, 9401, 9445 to 9862     BD-700-1A11   700-71-5005, dated December
    inclusive, and 9868 to       airplanes     14, 2020
    9879 inclusive

    60007 and 60015              BD-700-1A11   700-71-5501, dated December
                                 airplanes     14, 2020
    ______________________________________________________________________

(h) NO REPORTING REQUIREMENT

    Although the service  information identified in  table 1 to  paragraph
    (g)  of  this  AD  specifies  to  submit  certain  information  to the
    manufacturer, this AD does not include that requirement.

(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  700-71-005,  dated
    December 14, 2020.

(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
    responsible  Flight  Standards  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 responsible Flight  Standards
    Office.

(2) Contacting the Manufacturer:  For any requirement in this AD to obtain
    instructions   from   a  manufacturer,   the   instructions  must   be
    accomplished using  a method  approved by  the Manager,  New York  ACO
    Branch, FAA; or TCCA; or  Bombardier, Inc.'s TCCA 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) TCCA AD
    CF-2021-04, dated  February 15,  2021, for  related information.  This
    MCAI   may  be   found  in   the  AD   docket  on   the  internet   at
    https://www.regulations.gov by searching  for and locating  Docket No.
    FAA-2021-0560.

(2) For more information about this AD,  contact Elizabeth Dowling,  Aero-
    space Engineer, Mechanical Systems and Administrative Services Section
    FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY
    11590; telephone 516-228-7300; fax 516-794-5531; email 9-avs-nyaco-cos
    @faa.gov.

(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 700-1A11-71-005, dated December 14, 2020.

(ii) Bombardier Service Bulletin 700-71-005,  Revision 01, dated April 16,
     2021.

(iii) Bombardier Service Bulletin 700-71-5005, dated December 14, 2020.

(iv) Bombardier Service Bulletin 700-71-5501, dated December 14, 2020.

(v) Bombardier Service Bulletin 700-71-6005, dated December 14, 2020.

(vi) Bombardier Service Bulletin 700-71-6501, dated December 14, 2020.

(3) For service information identified  in  this  AD,  contact Bombardier,
    Inc.,  200 Cote-Vertu Road West, Dorval, Quebec H4S 2A3, Canada; tele-
    phone 514-855-2999;  email ac.yul@aero.bombardier.com; internet https:
    //www.bombardier.com.

(4) You may view this service information at the FAA,  Airworthiness Prod-
    ucts Section,  Operational  Safety  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 refer-
    ence at the National Archives and Records Administration  (NARA).  For
    information on the availability of this material  at  NARA,  email fr.
    inspection@nara.gov,   or   go  to:  https://www.archives.gov/federal-
    register/cfr/ibr-locations.html.

Issued on September 30, 2021.  Lance T. Gant,  Director, Compliance & Air-
worthiness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT:  Elizabeth Dowling,  Aerospace  Engineer,
Mechanical Systems and Administrative Services Section,  FAA, New York ACO
Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-
228-7300; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0560; Project Identifier MCAI-2021-00192-T;
Amendment 39-21764; AD 2021-21-04]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

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

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes.
This AD was prompted by reports that the sliding bushings in the
forward engine mount system were missing. This AD requires an
inspection (gap check) of the front and aft engine mounts to verify the
proper installation of the sliding bushings, and repair if necessary.
The FAA is issuing this AD to address the unsafe condition on these
products.

DATES: This AD is effective December 8, 2021.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of December 8,
2021.

ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 200 Cote-Vertu Road West, Dorval,
Quebec H4S 2A3, Canada; telephone 514-855-2999; email
ac.yul@aero.bombardier.com; internet https://www.bombardier.com. You
may view this service information at the FAA, Airworthiness Products
Section, Operational Safety 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 https://www.
regulations.gov by searching for and locating Docket No. FAA-2021-0560.

Examining the AD Docket

You may examine the AD docket on the internet at https://www.regulations.gov
by searching for and locating Docket No. FAA-2021-
0560; 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, any comments received, and other 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: Elizabeth Dowling, Aerospace Engineer,
Mechanical Systems and Administrative Services Section, FAA, New York
ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7300; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.

SUPPLEMENTARY INFORMATION:

Background

Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued TCCA AD CF-2021-04, dated February 15,
2021 (also referred to as the Mandatory Continuing Airworthiness
Information, or the MCAI), to correct an unsafe condition for certain
Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes. You may
examine the MCAI in the AD docket on the internet at https://www.regulations.gov
by searching for and locating Docket No. FAA-2021-0560.
The FAA 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 BD-700-1A10 and BD-700-1A11 airplanes. The NPRM published
in the Federal Register on July 9, 2021 (86 FR 36243). The NPRM was
prompted by reports that the sliding bushings in the forward engine
mount system were missing. The NPRM proposed to require an inspection
(gap check) of the front and aft engine mounts to verify the proper
installation of the sliding bushings, and repair if necessary. The FAA
is issuing this AD to address redistribution of load/stress on the
mount components, which may decrease the component fatigue life;
failure of the mount structural components could result in the loss of
the engine attachment to the airframe. See the MCAI for additional
background information.

Comments

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

Request To Update Certain Service Information and Provide Credit for
Actions Accomplished Using Previous Service Information


Bombardier, Inc., stated that Bombardier Service Bulletin 700-71-
005, dated December 14, 2020, has been updated to Bombardier Service
Bulletin 700-71-005, Revision 01, dated April
16, 2021. Bombardier, Inc., commented that the revised service
information provides a clarification specifically for a German
registered airplane having a serial number with a specific
configuration from a previous repair; no other changes were made
between revision levels. Bombardier, Inc., requested that, if
Bombardier Service Bulletin 700-71-005, Revision 01, dated April 16,
2021, is referenced, credit be provided for operators that have
previously completed the applicable actions using Bombardier Service
Bulletin 700-71-005, dated December 14, 2020.
The FAA agrees to update this final rule to reference Bombardier
Service Bulletin 700-71-005, Revision 01, dated April 16, 2021, for the
reasons provided above; the technical content and the intent of the
service information remains unchanged. The FAA has also added paragraph
(i) of this AD to provide credit for Bombardier Service Bulletin 700-
71-005, dated December 14, 2020, for previous actions that were
performed before the effective date of this AD. In addition, subsequent
paragraphs have been re-identified accordingly.

Conclusion

The FAA reviewed the relevant data, considered the comment
received, 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 these changes will not increase the
economic burden on any operator or increase the scope of this final
rule.

Related Service Information Under 1 CFR Part 51


Bombardier, Inc., has issued the following service information.
Bombardier Service Bulletin 700-1A11-71-005, dated
December 14, 2020.
Bombardier Service Bulletin 700-71-005, Revision 01, dated
April 16, 2021.
Bombardier Service Bulletin 700-71-5005, dated December
14, 2020.
Bombardier Service Bulletin 700-71-5501, dated December
14, 2020.
Bombardier Service Bulletin 700-71-6005, dated December
14, 2020.
Bombardier Service Bulletin 700-71-6501, dated December
14, 2020.
This service information describes procedures for verifying the
proper installation of the sliding bushings by doing an inspection (gap
check), including a gap outside acceptable limits, a missing or damaged
nut or bolt at the upper side of front mount beam, and a bolt that
turns freely with finger pressure. These documents are distinct since
they apply to different airplane serial numbers. 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 376 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:

Estimated Costs for Required Actions

Labor cost
Parts cost
Cost per product
Cost on U.S. operators
11 work-hours x $85 per hour = $935
$0
$935
$351,560

The FAA has received no definitive data on which to base the cost
estimates for the repairs specified in this AD.
The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all of the costs of
this AD may be covered under warranty, thereby reducing the cost impact
on affected operators.

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 rulemaking action.

Regulatory Findings

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) 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
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: