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PROPOSED AD DE HAVILLAND AIRCRAFT OF CANADA LIMITED (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.): Docket No. FAA-2022-1482; Project Identifier MCAI-2022-00697-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    January 9, 2023.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to De Havilland Aircraft of Canada Limited  (type cer-
    tificate previously held by Bombardier, Inc.) Model DHC-8-401 and -402
    airplanes, certificated in any category, serial numbers 4001, 4003 and
    subsequent.

(d) SUBJECT

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

(e) UNSAFE CONDITION

    This AD was prompted  by an investigation of  incorrectly manufactured
    sleeves that were potentially installed in the main landing gear (MLG)
    forward  door linkages.  The FAA  is issuing  this AD  to address  the
    discrepant sleeves with missing lubrication grooves, which can  result
    in  the  fatigue  failure  of the  forward  door  linkage,  leading to
    possible  interference  with  the  extension  or  retraction  of   the
    corresponding MLG.  The unsafe  condition, if  not corrected  and when
    combined  with  other  failures, could  result  in  an asymmetric  MLG
    configuration at landing and a subsequent runway excursion.

(f) COMPLIANCE

    Comply  with this  AD within  the compliance  times specified,  unless
    already done.

(g) AIRPLANE RECORDS REVIEW

    Within  30  days after  the  effective date  of  this AD,  review  the
    airplane  records  to determine  whether  any sleeve  P/N  46878-1 was
    replaced  after  October 29, 2019,  on  any  MLG forward  door linkage
    assembly P/N 46860.

(1) For any sleeve P/N 46878-1  that was replaced  after October 29, 2019,
    and  for  any  sleeve  for  which  its  replacement  date  cannot   be
    conclusively determined from the  records: Within 1,500 flight  cycles
    after  the effective  date of  this AD,  do the  actions specified  in
    paragraphs (g)(1)(i) and (ii) of  this AD, in accordance with  Section
    3.B. of the  Accomplishment Instructions of  De Havilland Aircraft  of
    Canada Limited  Service Bulletin  (SB) 84-32-169,  dated  February 28,
    2022.

(i) Do a general visual inspection of the sleeve  for the presence of lub-
    rication grooves, and  before further flight  replace any sleeve  that
    does not have lubrication grooves.

(ii) Do a general visual inspection of the MLG forward door linkage assem-
     blies (swivel  link, clevis  assembly, and  swivel end  assembly) for
     damage,  deformation,  erosion,  and  corrosion,  and  before further
     flight repair or replace the discrepant parts.

(2) If the records confirm  that  no  maintenance was performed on the MLG
    forward door  linkage assembly  P/N 46860  after October 29, 2019,  no
    further action is required by this paragraph.

(h) PARTS INSTALLATION PROHIBITION

    As of the effective date of this AD, no person may install, on any air
    -plane, a sleeve P/N 46878-1 with missing lubrication grooves.

(i) ADDITIONAL 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 the  attention of the  person identified in  paragraph (j)(2) of
    this AD. Information may be emailed to: 9-AVS-AIR-730-AMOC@faa.gov  or
    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. 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;  or De Havilland Aircraft of  Canada
    Limited's  Transport  Canada Design  Approval  Organization (DAO).  If
    approved  by the  DAO, the  approval must  include the  DAO-authorized
    signature.

(j) ADDITIONAL INFORMATION

(1) Refer to Transport Canada AD CF-2022-29,  dated May 27, 2022,  for re-
    lated information.  This  Transport Canada AD  may be found  in the AD
    docket at regulations.gov under Docket No. FAA-2022-1482.

(2) For more information about this AD, contact Gabriel Kim, Aerospace En-
    gineer,  Mechanical Systems and Administrative Services Section,  FAA,
    New York ACO Branch, 1600 Stewart Ave., Suite 410, Westbury, NY 11590;
    telephone 516-228-7300; email 9-avs-nyaco-cos@faa.gov.

(k) 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) De Havilland Aircraft of Canada Limited  Service Bulletin  (SB) 84-32-
    169, dated February 28, 2022.

(ii) [Reserved]

(3) For service information  identified in this AD,  contact  De Havilland
    Aircraft of Canada Limited,  Dash 8  Series  Customer Response Centre,
    5800 Explorer Drive, Mississauga, Ontario, L4W 5K9, Canada;  telephone
    North America (toll-free): 855-310-1013,  Direct: 647-277-5820;  email
    thd@dehavilland.com; website dehavilland.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: www.archives.gov/federal-register/cfr/
    ibr-locations.html.

Issued on November 15, 2022.  Ross Landes,  Deputy Director for Regulatory
Operations,  Compliance & Airworthiness Division,  Aircraft  Certification
Service.

DATES: The FAA  must  receive  comments  on this proposed AD by January 9,
2023.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-1482; Project Identifier MCAI-2022-00697-T]
RIN 2120-AA64

Airworthiness Directives; De Havilland Aircraft of Canada Limited
(Type Certificate Previously Held by 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 De Havilland Aircraft of Canada Limited Model DHC-8-401 and
-402 airplanes. This proposed AD was prompted by an investigation of
incorrectly manufactured sleeves that were potentially installed in the
main landing gear (MLG) forward door linkage assembly. This proposed AD
would require review of technical records and inspections to determine
if a discrepant sleeve is installed, replacement of any discrepant
sleeve and re-identification of the MLG forward door linkage assembly.
This proposed AD would also prohibit the installation of affected
parts. 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 January 9,
2023.

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 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.
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2022-1482; 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 mandatory continuing airworthiness
information (MCAI), any comments received, and other information. The
street address for Docket Operations is listed above.
Material Incorporated by Reference:
For service information identified in this NPRM, contact
De Havilland Aircraft of Canada Limited, Dash 8 Series Customer
Response Centre, 5800 Explorer Drive, Mississauga, Ontario, L4W 5K9,
Canada; telephone North America (toll-free): 855-310-1013, Direct: 647-
277-5820; email thd@dehavilland.com; website dehavilland.com.
For service information identified in this NPRM, contact
De Havilland Aircraft of Canada Limited, Dash 8 Series Customer
Response Centre, 5800 Explorer Drive, Mississauga, Ontario, L4W 5K9,
Canada; telephone North America (toll-free): 855-310-1013, Direct: 647-
277-5820; email dehavilland.com">thd@dehavilland.com; website dehavilland.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.

FOR FURTHER INFORMATION CONTACT: Gabriel Kim, 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; 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 ADDRESSES. Include ``Docket No. FAA-2022-1482; Project Identifier
MCAI-2022-00697-T'' at the beginning of your comments. The most helpful
comments reference a specific portion of the proposal, explain the
reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend
this proposal because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
regulations.gov, including any personal information you provide. The
agency will also post a report summarizing each substantive verbal
contact received about this NPRM.

Confidential Business Information

CBI is commercial or financial information that is both customarily
and actually treated as private by its owner. Under the Freedom of
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public
disclosure. If your comments responsive to this NPRM contain commercial
or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to
this NPRM, it is important that you clearly designate the submitted
comments as CBI. Please mark each page of your submission containing
CBI as ``PROPIN.'' The FAA will treat such marked submissions as
confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to
Gabriel Kim, 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; email 9-avs-nyaco-cos
@faa.gov. Any commentary that the FAA receives which is not
specifically designated as CBI will be placed in the public docket for
this rulemaking.

Background

Transport Canada, which is the aviation authority for Canada, has
issued AD CF-2022-29, dated May 27, 2022 (Transport Canada AD CF-2022-
29) (also referred to as the MCAI), to correct an unsafe condition for
certain De Havilland Aircraft of Canada Limited (Type Certificate
Previously Held by Bombardier, Inc.) airplanes. The MCAI states that
some forward door linkage sleeves, part number (P/N) 46878-1, have been
manufactured without lubrication grooves on the outer diameter. An
investigation confirmed that incorrectly manufactured sleeves were
potentially supplied from October 2019 to July 2021. A discrepant
sleeve with missing lubrication grooves can result in the fatigue
failure of the forward door linkage, leading to possible interference
with the extension or retraction of the corresponding MLG. This
condition, if not corrected and when combined with other failures,
could result in an asymmetric MLG configuration at landing and a
subsequent runway excursion.
You may examine the MCAI in the AD docket at regulations.gov under
Docket No. FAA-2022-1482.

Related Service Information Under 1 CFR Part 51

The FAA reviewed De Havilland Aircraft of Canada Limited Service
Bulletin (SB) 84-32-169, dated February 28, 2022. This service
information specifies procedures for
review of the airplane records to determine the date of replacement, if
any, of sleeve P/N 46878-1, a visual inspection of affected sleeves for
the presence of lubrication grooves, and a visual inspection of the
swivel link, clevis assembly, and swivel end assembly for discrepancies
including signs of damage, deformation, erosion, and corrosion.
Corrective actions include replacement of any sleeve that has missing
lubrication grooves; repair or replacement of any discrepant swivel
link, clevis assembly, and swivel end assembly; and re-identification
of the forward door linkage. Assemble the forward door linkage, torque
self-locking nuts, and re-install the forward door linkage assemblies.
This material is reasonably available because the interested
parties have access to it through their normal course of business or by
the means identified in ADDRESSES.

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
the FAA's bilateral agreement with the State of Design Authority, it
has notified the FAA of the unsafe condition described in the MCAI
described above. The FAA is issuing this NPRM after determining that
the unsafe condition described previously is likely to exist or develop
in other products of the same type design.

Proposed AD Requirements in This NPRM

This proposed AD would require accomplishing the actions specified
in the service information already described. This proposed AD would
also prohibit the installation of affected parts.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 56 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
3 work-hours x $85 per hour = $255
$0
$255
$14,280

The FAA estimates the following costs to do any necessary on-
condition actions that would be required based on the results of any
required actions. The FAA has no way of determining the number of
aircraft that might need these on-condition actions:

Estimated Costs of On-Condition Actions

Labor cost
Parts cost
Cost per product
3 work-hours x $85 per hour = $255 to replace the sleeve
$1,284
$1,539

The FAA has received no definitive data on which to base the cost
estimates for the on-condition repairs specified in this proposed 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 proposed 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

The FAA 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) Would not affect intrastate aviation in Alaska, and
(3) Would 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: