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2022-13-08 DE HAVILLAND AIRCRAFT OF CANADA LIMITED (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.):
Amendment 39-22094; Docket No. FAA-2022-0394; Project Identifier MCAI-2021-00904-T.

(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective August 10, 2022.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to De Havilland Aircraft of Canada Limited  Model DHC-
    8-401 and -402 airplanes, certificated in any category, serial numbers
    4001 and 4003 through 4622 inclusive.

(d) SUBJECT

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

(e) UNSAFE CONDITION

    This AD was prompted by reports of nose wheel steering (NWS) hydraulic
    motors jamming during pushback or towing caused by worn out piston rod
    shoes. The FAA is issuing this AD to address a possible NWS  hydraulic
    motor  jam,  which  could  lead to  a  runway  excursion  and loss  of
    controllability of the airplane.

(f) COMPLIANCE

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

(g) REQUIRED ACTIONS

    Within 12,000 flight hours or 72 months,  whichever occurs first after
    the effective date of this AD:  Inspect  to  determine the part number
    and serial number of the NWS hydraulic motor,  and  re-identify or re-
    place the NWS hydraulic motor, as applicable, in accordance with para-
    graph 3.B. of the Accomplishment Instructions of De Havilland Aircraft
    of Canada Service Bulletin 84-32-164, Revision A, dated May 13, 2021.

(h) PARTS INSTALLATION PROHIBITION

    As of the effective date of this AD,  no person  may install a NWS hy-
    draulic motor,  part number (P/N) RS1267-1, P/N RS1267-1 MOD SB 32-13,
    P/N RS1267-2, P/N RS1267-2 MOD SB 32-13, and P/N RS1267-3, on any air-
    plane.

(i) NO RETURN OF PARTS

    Although De Havilland Aircraft of Canada  Service Bulletin  84-32-164,
    Revision A, dated May 13, 2021,  specifies to return  certain parts to
    the manufacturer, this AD does not include that requirement.

(j) 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 De  Havilland Aircraft  of Canada  Limited Service
    Bulletin 84-32-164, dated April 20, 2020.

(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
    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.  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  De
    Havilland   Aircraft  of   Canada  Limited'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) TCCA AD
    CF-2021-28, dated August 5, 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-2022-
    0394.

(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; 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) De Havilland Aircraft of Canada Limited  Service  Bulletin  84-32-164,
    Revision A, dated May 13, 2021.

(ii) [Reserved]

(3) For service information  identified in this AD,  contact  De Havilland
    Aircraft of Canada Limited,  Q-Series Technical Help Desk, 123 Garratt
    Boulevard, Toronto, Ontario M3K 1Y5,  Canada;  telephone 416-375-4000;
    fax   416-375-4539;   email  thd@dehavilland.com;   internet  https://
    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:  https://www.archives.gov/federal-
    register/cfr/ibr-locations.html.

Issued on June 13, 2022.  Christina Underwood, Acting Director, Compliance
& Airworthiness 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; email 9-avs-nyaco-cos@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-0394; Project Identifier MCAI-2021-00904-T;
Amendment 39-22094; AD 2022-13-08]
RIN 2120-AA64

Airworthiness Directives; De Havilland Aircraft of Canada Limited
(Type Certificate Previously Held by 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 De Havilland Aircraft of Canada Limited Model DHC-8-401 and -
402 airplanes. This AD was prompted by reports of nose wheel steering
(NWS) hydraulic motors jamming during pushback or towing. This AD
requires doing an inspection to determine the part number and serial
number of the NWS hydraulic motor, and re-identifying or replacing the
NWS hydraulic motor if necessary. This AD also prohibits the
installation of certain NWS hydraulic motors. The FAA is issuing this
AD to address the unsafe condition on these products.

DATES: This AD is effective August 10, 2022.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of August 10,
2022.

ADDRESSES: For service information identified in this final rule,
contact De Havilland Aircraft of Canada Limited, Q-Series Technical
Help Desk, 123 Garratt Boulevard, Toronto, Ontario M3K 1Y5, Canada;
telephone 416-375-4000; fax 416-375-4539; email thd@dehavilland.com;
internet https://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. It is also
available on the internet at https://www.regulations.gov by searching
for and locating Docket No. FAA-2022-0394.

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-2022-
0394; 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; 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-2021-28, dated August 5,
2021 (also referred to after this as the Mandatory Continuing
Airworthiness Information, or the MCAI), to correct an unsafe condition
for certain De Havilland Aircraft of Canada Limited Model DHC-8-401 and
-402 airplanes. You may examine the MCAI in the AD docket at https://www.
regulations.gov by searching for and locating Docket No. FAA-2022-0394.
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain De Havilland
Aircraft of Canada Limited Model DHC-8-401 and -402 airplanes. The NPRM
published in the Federal Register on April 6, 2022 (87 FR 19813). The
NPRM was prompted by reports of NWS hydraulic motors jamming during
pushback or towing. The NPRM proposed to require doing an inspection to
determine the part number and serial number of the NWS hydraulic motor,
and re-identifying or replacing the NWS hydraulic motor if necessary.
The NPRM also proposed to prohibit the installation of certain NWS
hydraulic motors. The FAA is issuing this AD to address a possible NWS
hydraulic motor jam, which could lead to a runway excursion and loss of
controllability of the airplane. See the MCAI for additional background
information.

Discussion of Final Airworthiness Directive

Comments

The FAA received a comment from The Air Line Pilots Association,
International (ALPA), who supported the NPRM without change.

Conclusion

The FAA reviewed the relevant data, considered the comment
received, and determined that air safety requires adopting this AD as
proposed. Except for minor editorial changes, this AD is adopted as
proposed in the NPRM. None of the changes will increase the economic
burden on any operator. Accordingly, the FAA is issuing this AD to
address the unsafe condition on these products.

Related Service Information Under 1 CFR Part 51

De Havilland Aircraft of Canada Limited has issued Service Bulletin
84-32-164, Revision A, dated May 13, 2021. This service information
describes procedures for doing an inspection to determine the part
number and serial number of the NWS hydraulic motor, and re-identifying
the redesigned NWS hydraulic motor, or replacing the original NWS
hydraulic motor, as necessary.
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 52 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 11 work-hours x $85 per hour = $935
$80
Up to $1,015
Up to $52,780

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.

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: