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PROPOSED AD BOMBARDIER, INC.: Docket No. FAA-2020-0458; Product Identifier 2020-NM-029-AD.
(a) COMMENTS DUE DATE

    The FAA must receive comments by July 20, 2020.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD applies  to  Bombardier, Inc.,  Model  BD-100-1A10 airplanes,
    certificated  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  times
    specified 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 AS OF                COMPLIANCE TIME FROM THE
    THE EFFECTIVE DATE OF THIS AD                EFFECTIVE DATE OF 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, a 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
    Service 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, as applicable,  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 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-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) 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.  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.

Issued on May 22, 2020. Lance T Gant, Director, Compliance & Airworthiness
Division, Aircraft Certification Service.

DATES: The FAA must receive comments on this proposed AD by July 20, 2020.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-0458; Product Identifier 2020-NM-029-AD]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain Bombardier, Inc., Model BD-100-1A10 airplanes. This
proposed 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 proposed AD would require a modification of
the NLG shock strut cylinder. The FAA is proposing this AD to address
the unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by July 20,
2020.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:

Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the
instructions for submitting comments.

Fax: 202-493-2251.

Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.

Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.

For service information identified in this NPRM, 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.

Examining the AD Do
cket

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 NPRM, the regulatory evaluation, any comments received, and other
information. The street address for Docket Operations is listed above.
Comments will be available in the AD docket shortly after receipt.

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:

Comments Invited

The FAA invites you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under the ADDRESSES section. Include "Docket No. FAA-2020-0458;
Product Identifier 2020-NM-029-AD" at the beginning of your comments.
The FAA specifically invites comments on the overall regulatory,
economic, environmental, and energy aspects of this NPRM. The FAA will
consider all comments received by the closing date and may amend this
NPRM because of those comments.

The FAA will post all comments received, without change, to https://
www.regulations.gov, including any personal information you provide.
The FAA will also post a report summarizing each substantive verbal
contact received about this NPRM.

Discussion

Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian AD CF-2019-43, dated November
8, 2019 (referred to after this 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.

This proposed AD was prompted by a report that corrosion was found
on the shock strut cylinders during unscheduled maintenance of the NLG.
The FAA is proposing this AD to address corrosion of the NLG, which
could result in structural failure of the NLG. See the MCAI for
additional background information.

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.

FAA's Determination

This product has been approved by the aviation authority of another
country, and is approved for operation in the United States. Pursuant
to a bilateral agreement with the State of Design Authority, the FAA
has been notified of the unsafe condition described in the MCAI and
service information referenced above. The FAA is proposing this AD
because the agency evaluated all the relevant information and
determined the unsafe condition described previously is likely to exist
or develop on other products of the same type design.

Proposed Requirements of This NPRM

This proposed AD would require accomplishing the actions specified
in the service information described previously.

Costs of Compliance

The FAA estimates that this proposed AD affects 560 airplanes of
U.S. registry. The FAA estimates the following costs to comply with
this proposed 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

The FAA has determined that this proposed AD would not have
federalism implications under Executive Order 13132. This proposed AD
would 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 this proposed
regulation:

(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.

The Proposed Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 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):