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2021-09-17 BOMBARDIER, INC.: Amendment 39-21531; Docket No. FAA-2021-0101; Project Identifier MCAI-2020-01084-T.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective June 23, 2021.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD  applies  to Bombardier,  Inc., Model  BD-100-1A10 airplanes,
    certificated  in  any  category,  serial  numbers  20003 through 20457
    inclusive, and 20501 through 22999 inclusive.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 27, Flight controls.

(e) REASON

    This  AD was  prompted  by  a report  that the  inboard multi-function
    spoiler (MFS) surfaces failed to  deploy, which was caused by  missing
    notches on the piston seal of the MFS power control units (PCUs).  The
    FAA is issuing this AD to address MFS PCUs with improperly  configured
    piston seals,  which could  cause degraded  proportional lift  dumping
    (PLD) function. This condition could hinder the airplane from carrying
    out an emergency descent, resulting in structural damage and injury to
    occupants.

(f) COMPLIANCE

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

(g) DEFINITION OF AFFECTED PART

    For the purpose of this AD, an affected MFS PCU is an MFS PCU that has
    a serial number of 0001  through 1410 inclusive, except for  those MFS
    PCUs having the serial numbers listed in figure 1 to paragraph (g)  of
    this AD and  except for those  with the suffix  "A" at the  end of the
    serial number (i.e., serial number 1025A).

        FIGURE 1 TO PARAGRAPH (G): SERIAL NUMBERS THAT ARE NOT AFFECTED   
    ______________________________________________________________________
        66                605                 1287                1395
        72                671                 1334                1396
        175               720                 1337                1397
        200               727                 1368                1400
        331               728                 1369                1401
        441               773                 1370                1403
        448               778                 1373                1404
        449               812                 1376                1405
        456               831                 1380                1406
        470               887                 1382                1407
        494               991                 1385                1408
        495               1049                1386                1409
        498               1208                1387                -
        499               1236                1388                -
        561               1284                1394                -
    ______________________________________________________________________

(h) REQUIRED ACTIONS

(1) Within 12 months after the effective date of this AD: Do an inspection
    to determine  if affected  MFS PCUs  are installed  on the airplane in
    accordance with Paragraph 2.B.  of Bombardier Service Bulletin  100-27
    -17, Revision 03, dated June 19, 2020; or Bombardier Service  Bulletin
    350-27-010, dated June 19, 2020;  as applicable.  A review of airplane
    maintenance records is  acceptable in lieu  of this inspection  if the
    serial number of the MFS PCU can be conclusively determined from  that
    review.

(2) Within 12 months  after  the  effective date of this AD:  Replace  any
    affected MFS PCUs with MFS PCUs that are not affected,  in  accordance
    with  Paragraphs  2.C.,  2.D.,  2.E.,  and  2.F.,  as  applicable,  of
    Bombardier Service Bulletin 100-27-17,  Revision  03,  dated  June 19,
    2020; or Bombardier Service Bulletin 350-27-010,  dated June 19, 2020;
    as applicable.

(i) PARTS INSTALLATION PROHIBITION

    As of the effective date of this AD, no person may install an affected
    MFS PCU, on any airplane.

(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;
    phone:  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 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) TCCA AD
    CF-2020-26, dated August 4, 2020,  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-
    0101.

(2) For more information about this AD, contact Siddeeq Bacchus, Aerospace
    Engineer, Mechanical Systems and Administrative Services Section, FAA,
    New York  ACO Branch,  1600 Stewart Avenue,  Suite  410,  Westbury, NY
    11590; phone: 516-228-7362; 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 100-27-17,  Revision  03,  dated  June 19,
    2020.

(ii) Bombardier Service Bulletin 350-27-010, dated June 19, 2020.

(3) For  service information  identified in this AD,  contact  Bombardier,
    Inc., 200 Cote-Vertu Road West, Dorval,  Quebec H4S 2A3, Canada; North
    America toll-free phone: 1-866-538-1247  or  direct-dial phone: 1-514-
    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 fedreg
    .legal@nara.gov,  or go to: https://www.archives.gov/federal-register/
    cfr/ibr-locations.html.

Issued on April 23, 2021.  Gaetano A. Sciortino, Deputy Director for Stra-
tegic Initiatives,  Compliance & Airworthiness Division, Aircraft Certifi-
cation Service.

FOR FURTHER INFORMATION CONTACT:   Siddeeq  Bacchus,  Aerospace  Engineer,
Mechanical Systems and Administrative Services Section, FAA,  New York ACO
Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: 516-228
-7362; 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-2021-0101; Project Identifier MCAI-2020-01084-T;
Amendment 39-21531; AD 2021-09-17]
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-100-1A10 airplanes. This AD was
prompted by a report that the inboard multi-function spoiler (MFS)
surfaces failed to deploy, which was caused by missing notches on the
piston seal of the MFS power control units (PCUs). This AD requires an
inspection to determine if affected MFS PCUs are installed, and
replacement of affected MFS PCUs. The FAA is issuing this AD to address
the unsafe condition on these products.

DATES: This AD is effective June 23, 2021.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of June 23,
2021.

ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 200 Cote-Vertu Road West, Dorval,
Quebec H4S 2A3, Canada; North America toll-free phone: 1-866-
538-1247 or direct-dial phone: 1-514-855-2999; 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-2021-0101.

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-
0101; 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: Siddeeq Bacchus, Aerospace Engineer,
Mechanical Systems and Administrative Services Section, FAA, New York
ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone:
516-228-7362; 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-2020-26, dated August 4,
2020 (also referred to as the Mandatory Continuing Airworthiness
Information, or the MCAI), to correct an unsafe condition for certain
Bombardier, Inc., Model BD-100-1A10 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-2021-0101.
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-100-1A10 airplanes. The NPRM published in the Federal
Register on February 26, 2021 (86 FR 11667). The NPRM was prompted by a
report that the inboard MFS surfaces failed to deploy, which was caused
by missing notches on the piston seal of the MFS PCUs. The NPRM
proposed to require an inspection to determine if affected MFS PCUs are
installed, and replacement of affected MFS PCUs. The FAA is issuing
this AD to address MFS PCUs with improperly configured piston seals,
which could cause degraded proportional lift dumping (PLD) function.
This condition could hinder the airplane from carrying out an emergency
descent, resulting in structural damage and injury to occupants. See
the MCAI for additional background information.

Comments

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.

Conclusion

The FAA reviewed the relevant data and determined that air safety
and the public interest require adopting this final rule as proposed,
except for 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.

Related Service Information Under 1 CFR Part 51


Bombardier has issued the following service information. This
service information describes procedures for an inspection to determine
if affected MFS PCUs are installed, and replacement of affected MFS
PCUs. These documents are distinct since they apply to different
airplane configurations.
Bombardier Service Bulletin 100-27-17, Revision 03, dated
June 19, 2020.
Bombardier Service Bulletin 350-27-010, dated June 19,
2020.
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 630 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
Up to 19 work-hours x $85 per hour = Up to $1,615 Up to $19,600 (up to 4 MFS PCUs per airplane) Up to $21,215 (up to 4 MFS PCUs per airplane) Up to $13,365,450 (up to 4 MFS PCUs per airplane)

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 operators. The FAA does not control warranty coverage for
affected operators. As a result, the FAA has included all known costs
in the 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 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: