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2020-25-06 BOMBARDIER, INC.: Amendment 39-21348; Docket No. FAA-2020-0458; Product Identifier 2020-NM-029-AD.
(a) EFFECTIVE DATE

    This AD is effective January 27, 2021.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to Bombardier, Inc., Model BD-100-1A10 airplanes, cer-
    tificated in any category,  serial numbers  (S/Ns) 20003 through 20767
    inclusive.

(d) SUBJECT

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

(e) REASON

    This AD was prompted by a report that corrosion was found on the shock
    strut cylinders  during unscheduled  maintenance of  the nose  landing
    gear (NLG). The  FAA is issuing  this AD to  address corrosion of  the
    NLG, which could result in structural failure of the NLG.

(f) COMPLIANCE

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

(g) MODIFICATION FOR AIRPLANES WITH S/N 20003 THROUGH 20500 INCLUSIVE

    For  Bombardier,  Inc.,  Model BD-100-1A10  airplanes  with  S/N 20003
    through 20500 inclusive: At  the applicable compliance time  specified
    in  paragraph  (g)(1)  or  (2) of  this  AD,  do  the modification  in
    paragraph (g)(1) or (2) of this AD, as applicable.

(1) For airplanes with NLG assemblies  with 96 months  or  less time since
    new (TSN) as of the effective date  of this AD:  At  the  NLG 96-month
    scheduled inspection,  do a modification of the NLG shock strut cylin-
    der, in accordance with paragraph 2.B.  of the Accomplishment Instruc-
    tions  of  Bombardier Service Bulletin 100-32-33,  Revision 02,  dated
    September 30, 2019.

(2) For airplanes  with NLG assemblies  with more than 96 months TSN as of
    the effective date of this AD: At the applicable compliance time spec-
    ified in figure 1 to paragraph (g) of this AD,  do  a  modification of
    the NLG shock strut cylinder, in accordance with paragraph 2.C. of the
    Accomplishment Instructions of Bombardier  Service Bulletin 100-32-33,
    Revision 02, dated September 30, 2019.

                 FIGURE 1 TO PARAGRAPH (G)  COMPLIANCE TIME              
    ______________________________________________________________________
    NLG ASSEMBLIES WITH TSN                          COMPLIANCE TIME FROM
    AS OF THE EFFECTIVE DATE                         THE EFFECTIVE DATE OF
    OF THIS AD                                       THIS AD
    ______________________________________________________________________
    More than 96 months, but less than 108 months    Within 56 months

    108 months or more, but less than 120 months     Within 50 months

    120 months or more, but less than 132 months     Within 44 months

    132 months or more, but less than 144 months     Within 36 months

    144 months or more, but less than 156 months     Within 27 months

    156 months or more, but less than 174 months     Within 18 months

    174 months or more, but less than 192 months     At 192-month overhaul
    ______________________________________________________________________

(h) MODIFICATION FOR AIRPLANES WITH S/N 20501 THROUGH 20767 INCLUSIVE

    For Bombardier, Inc.,  Model  BD-100-1A10  airplanes  with  S/N  20501
    through 20767 inclusive:  At the NLG 96-month scheduled inspection, do
    a modification  of the NLG shock strut cylinder,  in  accordance  with
    paragraph  2.B.  of  the  Accomplishment  Instructions  of  Bombardier
    Service Bulletin 350-32-009, Revision 02, dated September 30, 2019.

(i) PARTS INSTALLATION LIMITATION

    As of the effective date of this AD,  no person  may install,  on  any
    airplane an NLG shock strut assembly with part number (P/N) 40630-111,
    P/N 40630-113 or P/N 44630-101, unless it has been modified in accord-
    ance with paragraphs 2.B. or 2.C.  of the  Accomplishment Instructions
    of Bombardier Service Bulletin 100-32-33, Revision 02, dated September
    30, 2019;  or  paragraph 2.B.  of  the  Accomplishment Instructions of
    Bombardier Service Bulletin 350-32-009,  Revision 02,  dated September
    30, 2019; as applicable.

(j) CREDIT FOR PREVIOUS ACTIONS

(1) 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 paragraph 2.B. or 2.C.,  as applicable, of Bombardier
    Service Bulletin 100-32-33, dated October 31, 2018 or Bombardier Serv-
    ice Bulletin 100-32-33, Revision 01, July 31, 2019.

(2) This paragraph provides credit  for actions required  by paragraph (h)
    of this AD,  if those actions were performed before the effective date
    of this AD using paragraph 2.B. of Bombardier Service Bulletin 350-32-
    009, dated October 31, 2018 or Bombardier Service Bulletin 350-32-009,
    Revision 01 dated July 31, 2019;  provided  that  the  NLG shock strut
    assembly with P/N 44630-101 was removed  in lieu  of P/N 44610-101, as
    specified  in paragraph 2.B.(1)  of the Accomplishment Instructions of
    Bombardier Service Bulletin  350-32-009,  dated  October 31, 2018;  or
    Bombardier Service Bulletin 350-32-009,  Revision  01  dated  July 31,
    2019.

(k) 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
    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's TCCA Design Approval  Organization (DAO). If approved  by
    the DAO, the approval must include the DAO-authorized signature.

(l) RELATED INFORMATION

(1) Refer   to   Mandatory  Continuing  Airworthiness  Information  (MCAI)
    Canadian AD CF-2019-43,  dated November 8, 2019,  for related informa-
    tion.  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-2020-0458.

(2) For more information about this AD, contact Darren Gassetto, Aerospace
    Engineer, Mechanical Systems and Administrative Services Section, FAA,
    New York  ACO Branch,  1600 Stewart Avenue,  Suite  410,  Westbury, NY
    11590; telephone 516-228-7323; fax 516-794-5531; email 9-avs-nyaco-cos
    @faa.gov.

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

(m) 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 100-32-33 Revision 02, dated September 30,
    2019.

(ii) Bombardier Service Bulletin 350-32-009, Revision 02,  dated September
     30, 2019.

(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 telephone 1-866-538-1247 or direct-dial telephone 1-
    514-855-2999;  email ac.yul@aero.bombardier.com;  internet http://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 December 1, 2020. Gaetano A Sciortino, Deputy Director for Stra-
tegic Initiatives,  Compliance & Airworthiness Division, Aircraft Certifi-
cation Service.

FOR FURTHER INFORMATION CONTACT: Darren Gassetto,  Aerospace Engineer, Me-
chanical Systems and Administrative Services Section,  FAA,  New York  ACO
Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-
228-7323; 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-2020-0458; Product Identifier 2020-NM-029-AD; Amendment
39-21348; AD 2020-25-06]
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 corrosion was found on the shock strut
cylinders during unscheduled maintenance of the nose landing gear
(NLG). This AD requires a modification of the NLG shock strut cylinder.
The FAA is issuing this AD to address the unsafe condition on these
products.

DATES: This AD is effective January 27, 2021.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of January 27,
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 telephone 1-866-
538-1247 or direct-dial telephone 1-514-855-2999; email
ac.yul@aero.bombardier.com; internet http://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-2020-0458.

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-2020-
0458; 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
: Darren Gassetto, Aerospace Engineer,
Mechanical Systems and Administrative Services Section, FAA, New York
ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7323; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian AD CF-2019-43, dated November
8, 2019 (``AD CF-2019-43'') (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-2020-0458.
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 June 3, 2020 (85 FR 34141). The NPRM was prompted by a
report that corrosion was found on the shock strut cylinders during
unscheduled maintenance of the NLG. The NPRM proposed to require a
modification of the NLG shock strut cylinder. The FAA is issuing this
AD to address corrosion of the NLG, which could result in structural
failure of the NLG. 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 that comment.

Request To Revise Certain Compliance Language in the Proposed AD

Flexjet stated that where the compliance section of Bombardier
Service Bulletin 100-32-33, Revision 02, dated September 30, 2019, and
Figure 1 to paragraph (g) of the proposed AD, specify the compliance
time for NLG assemblies with more than 96 months time since new (TSN),
the compliance time does not take into account that the NLG cylinders
with part number (P/N) 40640-3 and P/N 40640-5 serialized (next higher
assembly P/N 40640-105 and subcomponents) are life-limited items with a
7,500 flight cycle discard interval. Flexjet commented that during the
first 96 month inspection, if the operator has high flight cycles, it
may elect to replace the cylinder at that time. Flexjet also commented
that the compliance section of Bombardier Service Bulletin 100-32-33,
Revision 02, dated September 30, 2019, does not take into account that
a new cylinder could be installed at the 96-month inspection and it
also does not address if the cylinder was replaced for another reason
after the 96-month inspection.
Flexjet stated that the proposed AD needs to be specific on
applying to the nose gear cylinder and sleeve part numbers and not the
nose gear or nose gear strut assembly part numbers. Flexjet also stated
that the nose gear cylinder and sleeve are the parts with corrosion and
the primary reason for the service information. Flexjet pointed out
that the sleeve is cut off for inspection of the cylinder and the same
part number sleeve goes back on following the inspection. The FAA
infers that Flexjet was requesting that the language in paragraphs
(g)(1) and (2) of this AD specify that the actions apply to airplanes
with NLG assemblies having NLG cylinder assemblies and sleeves with
certain part numbers.
The FAA disagrees with the comment. While NLG cylinder assemblies
and their subcomponents can be replaced before or after the 96-month
interval inspection, paragraphs 2.B. and 2.C. of the Accomplishment
Instructions of Bombardier Service Bulletin 100-32-33, Revision 02,
dated September 30, 2019, ensure the proper corrective actions are
taken to prevent corrosion with those replaced components when
reassembled on the NLG assembly. This is why the identification on the
NLG assembly modplate is required. In addition, paragraph (f) of this
AD specifies to, ``Comply with this AD within the compliance times
specified, unless already done.'' Therefore, if some of the specified
corrective actions are already complied with, only the remaining corrective
actions in the AD need to be completed to comply with this AD. The FAA has
not changed this AD in this regard.

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 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 Service Bulletin 100-32-33, Revision 02,
dated September 30, 2019; and Service Bulletin 350-32-009, Revision 02,
dated September 30, 2019. This service information describes procedures
for modification of the NLG shock strut cylinder. 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 560 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 54 work-hours x $85 per hour = Up to $4,590 $43,999 Up to $48,589 Up to $27,209,840

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 (AD):