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PROPOSED AD DE HAVILLAND AIRCRAFT OF CANADA LIMITED (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.): Docket No. FAA-2023-2137; Project Identifier MCAI-2022-01389-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    December 11, 2023.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD applies  to all De Havilland Aircraft of Canada Limited Model
    DHC-8-401 and -402 airplanes, certificated in any category.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 05,  Time Limits/Main-
    tenance Checks.

(e) REASON

    This AD was prompted by  a determination that new or  more restrictive
    airworthiness limitations are necessary. The FAA is issuing this AD to
    address  new  or more  restrictive  maintenance interval  limitations.
    Failure to adhere to the specified interval limitations may result  in
    reduced structural integrity of the airplane.

(f) COMPLIANCE

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

(g) MAINTENANCE OR INSPECTION PROGRAM REVISION

    Within 60 days after the effective date of this AD,  revise the exist-
    ing maintenance or inspection  program, as applicable, to  incorporate
    the information specified in figure 1 to paragraph (g) of this AD. The
    initial compliance time for doing the task is at the time specified in
    the initial  compliance time  column of  figure 1  to paragraph (g) of
    this AD  or within  12 months  after the  effective date  of this  AD,
    whichever occurs later.
    ______________________________________________________________________
                    FIGURE 1 TO PARAGRAPH (G)  AMM TASKS                 
    ______________________________________________________________________
    EFFECTIVITY   INITIAL COMPLIANCE   INTERVAL LIMITATION     AMM TASK
                        TIME
    ______________________________________________________________________
    All           10,000 total             10,000 FH      21-31-00-710-801
                  flight hours (FH)
    All           20,000 total FH          20,000 FH      21-31-00-710-803
    All           20,000 total FH          20,000 FH      21-31-00-710-804
    All           35,000 total FH          35,000 FH      22-11-00-720-803
    All           30,000 total FH          30,000 FH      26-20-00-900-801
    All           30,000 total FH          30,000 FH      26-20-00-900-802
    All           30,000 total FH          30,000 FH      26-20-00-900-805
    All           30,000 total FH          30,000 FH      26-20-00-900-807
    All           30,000 total FH          30,000 FH      26-20-00-900-803
    All           30,000 total FH          30,000 FH      26-20-00-900-804
    All           20,000 total FH          20,000 FH      26-20-00-710-801
    All           20,000 total FH          20,000 FH      28-21-00-710-801
    All           10,000 total FH          10,000 FH      29-12-00-720-803
    All           4,950 total FH           4,950 FH       29-12-00-720-805
    All           4,950 total FH           4,950 FH       29-12-00-720-802
    All           4,950 total FH           4,950 FH       29-12-00-720-804
    All           30,000 total FH          30,000 FH      30-11-00-710-802
    All           5,280 total FH           5,280 FH       31-41-00-710-802
    All           1,760 total FH           1,760 FH       32-11-00-210-802
    All           30,000 total FH          30,000 FH      52-24-00-210-802
    All           4,400 total FH           4,400 FH       61-20-00-710-802
    All           150 total FH             150 FH         77-31-00-710-803
    ______________________________________________________________________

(h) NO ALTERNATIVE ACTIONS OR INTERVALS

    After the existing maintenance or inspection program has been  revised
    as required by paragraph (g) of this AD, no alternative actions (e.g.,
    inspections), intervals,  may be  used unless  the actions, intervals,
    are  approved  as  an  alternative  method  of  compliance  (AMOC)  in
    accordance with the procedures  specified in paragraph (i)(1)  of this
    AD.

(i) OTHER FAA AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager, International
    Validation 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 International  Validation Branch,
    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.
    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,  International
    Validation 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-2022-59,  dated October 27, 2022,  for
    related information.  This Transport Canada AD  may be found in the AD
    docket at regulations.gov under Docket No. FAA-2023-2137.

(2) For more information  about this AD,  contact  Fatin Saumik,  Aviation
    Safety Engineer,  FAA,  1600 Stewart Avenue,  Suite 410,  Westbury, NY
    11590; telephone: 516-228-7300; email: 9-avs-nyaco-cos@faa.gov.

(k) MATERIAL INCORPORATED BY REFERENCE

    None.

Issued on October 20, 2023.  Ross Landes,  Deputy Director  for Regulatory
Operations,  Compliance & Airworthiness Division,  Aircraft  Certification
Service.

DATES: The FAA must receive comments  on this proposed AD  by December 11,
2023.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-2137; Project Identifier MCAI-2022-01389-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 all De Havilland Aircraft of Canada Limited Model DHC-8-401 and -
402 airplanes. This proposed AD was prompted by a determination that
new or more restrictive airworthiness limitations are necessary. This
proposed AD would require revising the existing maintenance or
inspection program, as applicable, to incorporate new or more
restrictive airworthiness limitations. 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 December
11, 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-2023-2137; 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.
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: Fatin Saumik, Aviation Safety
Engineer, FAA, 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-2023-2137; Project Identifier
MCAI-2022-01389-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
the 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 Fatin
Saumik, Aviation Safety Engineer, FAA, 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 Transport Canada AD CF-2022-59, dated October 27, 2022
(Transport Canada AD CF-2022-59) (also referred to after this as the
MCAI), to correct an unsafe condition for all De Havilland Aircraft of
Canada Limited Model DHC-8-401 and -402 airplanes. The MCAI states that
new or more restrictive airworthiness limitations have been developed.
The FAA is proposing this AD to address new or more restrictive
maintenance interval limitations. Failure to adhere to the specified
interval limitations may result in reduced structural integrity of the
airplane. You may examine the MCAI in the AD docket at regulations.gov
under Docket No. FAA-2023-2137.

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 this 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 FAA 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 revising the existing maintenance or
inspection program, as applicable, to incorporate new or more
restrictive airworthiness limitations.
This proposed AD would require revisions to certain operator
maintenance documents to include new actions (e.g., inspections).
Compliance with these actions is required by 14 CFR 91.403(c). For
airplanes that have been previously modified, altered, or repaired in
the areas addressed by this proposed AD, the operator may not be able
to accomplish the actions described in the revisions. In this
situation, to comply with 14 CFR 91.403(c), the operator must request
approval for an alternative method of compliance according to paragraph
(i)(1) of this proposed AD.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 53 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:
The FAA has determined that revising the maintenance or inspection
program takes an average of 90 work-hours per operator, although the
agency recognizes that this number may vary from operator to operator.
Since operators incorporate maintenance or inspection program changes
for their affected fleet(s), the FAA has determined that a per-operator
estimate is more accurate than a per-airplane estimate. Therefore, the
agency estimates the average total cost per operator to be $7,650 (90
work-hours x $85 per work-hour).

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: