Proposed Rule2022-05964
Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
Primary source
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Published
March 24, 2022
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to adopt a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-400 series airplanes. This proposed AD was prompted by reports of broken P- clamps on the pressure relief line and the motive flow line in the fuel tanks, and a subsequent determination that certain service information lacked instructions for maintaining appropriate clearance between certain fuel tubes and their support brackets, and may also have led to incorrect installation of certain Teflon<SUP>TM</SUP> sleeves. This proposed AD was also prompted by a determination that new or more restrictive airworthiness limitations are necessary. This proposed AD would require inspecting the motive flow line, vent line, and related parts, and adding support or additional clearance if necessary. This proposed AD would also require inspection, and replacement or relocation if necessary, of affected Teflon<SUP>TM</SUP> sleeves on the vent line, and installation of Teflon<SUP>TM</SUP> sleeves on the vent line at additional wing stations. This proposed AD would also 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.
Full Text
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<title>Federal Register, Volume 87 Issue 57 (Thursday, March 24, 2022)</title>
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[Federal Register Volume 87, Number 57 (Thursday, March 24, 2022)]
[Proposed Rules]
[Pages 16661-16667]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-05964]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2022-0287; Project Identifier MCAI-2020-01602-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).
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[[Page 16662]]
SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain De Havilland Aircraft of Canada Limited Model DHC-8-400
series airplanes. This proposed AD was prompted by reports of broken P-
clamps on the pressure relief line and the motive flow line in the fuel
tanks, and a subsequent determination that certain service information
lacked instructions for maintaining appropriate clearance between
certain fuel tubes and their support brackets, and may also have led to
incorrect installation of certain Teflon<SUP>TM</SUP> sleeves. This
proposed AD was also prompted by a determination that new or more
restrictive airworthiness limitations are necessary. This proposed AD
would require inspecting the motive flow line, vent line, and related
parts, and adding support or additional clearance if necessary. This
proposed AD would also require inspection, and replacement or
relocation if necessary, of affected Teflon<SUP>TM</SUP> sleeves on the
vent line, and installation of Teflon<SUP>TM</SUP> sleeves on the vent
line at additional wing stations. This proposed AD would also 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 May 9,
2022.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
<bullet> Federal eRulemaking Portal: Go to <a href="https://www.regulations.gov">https://www.regulations.gov</a>. Follow the instructions for submitting comments.
<bullet> Fax: 202-493-2251.
<bullet> 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.
<bullet> 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 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 <a href="/cdn-cgi/l/email-protection#186c707c587c7d70796e71747479767c367b7775"><span class="__cf_email__" data-cfemail="3b4f535f7b5f5e535a4d5257575a555f15585456">[email protected]</span></a>; internet <a href="https://dehavilland.com">https://dehavilland.com</a>. 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 Docket
You may examine the AD docket at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by
searching for and locating Docket No. FAA-2022-0287; 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, any comments
received, and other information. The street address for Docket
Operations is listed above.
FOR FURTHER INFORMATION CONTACT: Joseph Catanzaro, Aerospace Engineer,
Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart
Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7366; email <a href="/cdn-cgi/l/email-protection#340d19554247195a4d55575b19575b47745255551a535b42"><span class="__cf_email__" data-cfemail="281105495e5b054651494b47054b475b684e4949064f475e">[email protected]</span></a>.
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-2022-0287; Project Identifier
MCAI-2020-01602-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
<a href="https://www.regulations.gov">https://www.regulations.gov</a>, 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
Joseph Catanzaro, Aerospace Engineer, Airframe and Propulsion Section,
FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; telephone 516-228-7366; email <a href="/cdn-cgi/l/email-protection#40796d2136336d2e3921232f6d232f33002621216e272f36"><span class="__cf_email__" data-cfemail="e3dace829590ce8d9a82808cce808c90a3858282cd848c95">[email protected]</span></a>. 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 Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued TCCA AD CF-2017-05R2, dated September
20, 2019 (CF-2017-05R2) (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-8-400, -401, and -402 airplanes. You may examine the MCAI in
the AD docket at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and
locating Docket No. FAA-2022-0287.
This proposed AD was prompted by reports of broken P-clamps on the
pressure relief line and the motive fuel line in the fuel tanks, as
well as fouling conditions between the motive flow line and the
collector tank partition wall in both fuel tanks. Later, certain
service information designed to mitigate these issues was found to not
contain instructions to support the motive flow line and vent line at
wing stations -371.019 and 371.019 in the fuel tanks or to maintain
appropriate clearance between the fuel tubes and their support brackets
at wing stations -371.019 and -209.109 in the left-hand fuel tank and
wing stations 371.019 and 209.019 in the right-hand fuel tank.
Bombardier issued Modification Summaries (ModSums) to provide
instructions for addressing the initial reports of inadequate
clearance. Bombardier later issued revised service information to
address this inadequate support and clearance on all affected
airplanes. Subsequently, the manufacturer determined that certain
service information was missing instructions to relocate certain
Teflon<SUP>TM</SUP> sleeves and certain other service information may
have caused Teflon<SUP>TM</SUP> sleeves to be incorrectly installed on
the vent line. The FAA is proposing this AD to address adverse impacts
on the integrity of the electrical bonding paths throughout the fuel
line, which could lead to arcing between the vent line and airplane
structure, and could result in
[[Page 16663]]
possible fuel tank ignition in the event of a lightning strike.
See the MCAI for additional background information.
Related Service Information Under 1 CFR Part 51
De Havilland Aircraft of Canada Limited has issued the following
Bombardier service information.
<bullet> Bombardier Service Bulletin 84-28-18, Revision B, dated
April 20, 2017, which describes procedures for increasing the hole size
in the collector tank partition wall, inspecting the motive flow line
for damage, and replacing the associated grommet and motive flow line.
<bullet> Bombardier Service Bulletin 84-28-19, Revision D, dated
February 16, 2018, which describes procedures for replacing the
affected single nut plate brackets and standoffs at the affected left-
hand (LH) and right-hand (RH) wing stations on the motive flow line and
pressure relief line; inspecting the motive flow line and vent line at
certain wing stations in the fuel tanks to ensure that these fuel tubes
are adequately supported; and inspecting the fuel tubes to verify that
an appropriate clearance has been maintained between the fuel tubes and
their support brackets.
<bullet> Bombardier Service Bulletin 84-28-24, dated November 27,
2017, which describes procedures for installing Teflon<SUP>TM</SUP>
sleeves on the vent line at the specified wing stations in the LH and
RH fuel tanks, inspecting the Teflon<SUP>TM</SUP> sleeve installation
on the vent line at those wing stations in the LH and RH fuel tanks,
and repositioning the Teflon<SUP>TM</SUP> sleeves.
<bullet> Bombardier Service Bulletin 84-28-25, dated November 27,
2017, which describes procedures for inspecting the Teflon<SUP>TM</SUP>
sleeve installation on the vent line in the LH and RH fuel tanks for
correct installation and damage, and replacing and repositioning the
Teflon<SUP>TM</SUP> sleeves.
De Havilland Aircraft of Canada Limited has also issued the
following Bombardier service information, which describes procedures
for replacing the affected single nut plate brackets and standoffs on
the motive flow line and vent line at LH and RH wing stations. These
documents are distinct since they apply to different airplane
configurations.
<bullet> Bombardier Repair Drawing 8/4-28-018, Issue 1, dated
October 30, 2017.
<bullet> Bombardier Repair Drawing 8/4-28-018, Issue 2, dated June
12, 2018.
<bullet> Bombardier Repair Drawing 8/4-28-018, Issue 3, dated June
21, 2018.
<bullet> Bombardier Repair Drawing 8/4-28-018, Issue 4, dated July
27, 2018.
De Havilland Aircraft of Canada Limited has also issued the
following Bombardier service information, which describes fuel systems
limitations. These documents are distinct because they apply to
different airplane configurations.
<bullet> (Bombardier) Q400 Dash 8 Temporary Revision (TR) ALI-0192,
dated April 24, 2018, to Section 4--28 Fuel System Limitation, of Part
2, of the Bombardier Q400 Dash 8 Maintenance Requirements Manual (MRM),
PSM 1-84-7.
<bullet> (Bombardier) Q400 Dash 8 TR ALI-0193, dated April 24,
2018, to Section 5--00 Critical Design Configuration Control
Limitations, of the Bombardier Q400 Dash 8 MRM, PSM 1-84-7.
De Havilland Aircraft of Canada Limited has also issued the
following Bombardier service information, which describes new or more
restrictive airworthiness limitations for fuel tank systems. These
documents are distinct because they apply to different airplane
configurations.
<bullet> (Bombardier) Q400 Dash 8 Airplane Maintenance Manual (AMM)
TR 28-145, dated November 21, 2017.
<bullet> (Bombardier) Q400 Dash 8 AMM TR 28-146, dated November 21,
2017.
<bullet> (Bombardier) Q400 Dash 8 AMM TR 28-147, dated November 21,
2017.
<bullet> (Bombardier) Q400 Dash 8 AMM TR 28-148, dated November 24,
2017.
<bullet> (Bombardier) Q400 Dash 8 AMM TR 28-149, dated November 27,
2017.
<bullet> (Bombardier) Q400 Dash 8 Maintenance Task Card Manual
(MTCM) Maintenance Task Card 000-28-520-704 (Config A01), Detailed
Inspection of the Teflon<SUP>TM</SUP> Sleeve on the Fuel Tank Vent Line
(LH), Revision 42, Amendment 0002, dated November 21, 2017.
<bullet> (Bombardier) Q400 Dash 8 MTCM Maintenance Task Card 000-
28-620-704 (Config A01), Detailed Inspection of the Teflon<SUP>TM</SUP>
Sleeve on the Fuel Tank Vent Line (RH), Revision 42, Amendment 0002,
dated November 21, 2017.
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 the FAA's 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 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 AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified
in the service information already described. This proposed AD would
allow using Bombardier Repair Drawing 8/4-28-018 as a method of
compliance for the actions required by paragraph (h)(2) of this
proposed AD, provided the replacement of the affected single nut plate
brackets and standoffs on the motive flow line, vent line, pressure
relief line, and scavenge line at LH and RH wing stations Yw <plus-
minus> 209.019, Yw <plus-minus> 317.019, and Yw <plus-minus> 371.019,
is also done.
This proposed AD would also require revising the existing
maintenance or inspection program, as applicable, to incorporate new or
more restrictive airworthiness limitations for fuel tank systems.
This proposed AD would require revisions to certain operator
maintenance documents to include new actions (e.g., inspections) and
Critical Design Configuration Control Limitations (CDCCLs). Compliance
with these actions and CDCCLs 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
(n)(1) of this proposed AD.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 52 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:
[[Page 16664]]
Estimated Costs for Required Actions *
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Labor cost Parts cost Cost per product Cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
Up to 93 work-hours x $85 per hour = Up to $7,862........... Up to $15,767.......... Up to $819,884.
Up to $7,905.
----------------------------------------------------------------------------------------------------------------
* Table does not include estimated costs for revising the maintenance or inspection program.
The FAA has determined that revising the maintenance or inspection
program takes an average of 90 work-hours per operator, although the
FAA recognizes that this number may vary from operator to operator. In
the past, the FAA has estimated that this action takes 1 work-hour per
airplane. 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 FAA estimates the total cost per operator to be $7,650
(90 work-hours x $85 per work-hour).
The FAA has received no definitive data on which to base the cost
estimates for the on-condition actions specified in this proposed AD.
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
0
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]
0
2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive:
De Havilland Aircraft of Canada Limited (Type Certificate Previously
Held by Bombardier, Inc.): Docket No. FAA-2022-0287; Project
Identifier MCAI-2020-01602-T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by May 9, 2022.
(b) Affected ADs
None.
(c) Applicability
This AD applies to De Havilland Aircraft of Canada Limited (type
certificate previously held by Bombardier, Inc.) Model DHC-8-400, -
401, and -402 airplanes, certificated in any category, serial
numbers (S/Ns) 4001, 4003, and subsequent.
(d) Subject
Air Transport Association (ATA) of America Code 28, Fuel System;
and 05, Time Limits/Maintenance Checks.
(e) Unsafe Condition
This AD was prompted by reports of broken P-clamps on the
pressure relief line and the motive flow line in the fuel tanks, and
a subsequent determination that certain service information lacked
instructions for maintaining appropriate clearance between certain
fuel tubes and their support brackets, and may also have led to
incorrect installation of certain Teflon<SUP>TM</SUP> sleeves. The
FAA is issuing this AD to address adverse impacts on the integrity
of the electrical bonding paths throughout the fuel line, which
could lead to arcing between the vent line and airplane structure,
and could result in possible fuel tank ignition in the event of a
lightning strike.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Definition
For the purposes of this AD, ``prohibited tasks'' are defined as
any task identified in paragraph (l) of this AD and any procedure or
task that specifies fuel tank access using non-manufacturer-approved
procedures.
(h) Modifications
(1) For airplanes having S/N 4001 and 4003 through 4525
inclusive: Within 6,000 flight hours or 36 months after the
effective date of this AD, whichever occurs first, increase the hole
size in the collector tank partition wall, inspect the motive flow
line for damage, and replace the associated grommet and motive flow
line, in accordance with paragraph 3.B. of the Accomplishment
Instructions of Bombardier Service Bulletin 84-28-18, Revision B,
dated April 20, 2017.
(2) For airplanes having S/N 4001 and 4003 through 4533
inclusive, on which Bombardier Service Bulletin 84-28-19, dated
August 16, 2016; or Revision A, dated November 4, 2016, has not been
done: Within 6,000 flight hours or 36 months after the effective
date of this AD, whichever occurs first, replace the affected single
nut plate brackets and standoffs at the affected left-hand (LH) and
right-hand (RH) wing stations on the motive flow line and pressure
relief line, in accordance with paragraphs 3.B. and 3.C. of
Bombardier Service Bulletin 84-28-19, Revision D, dated February 16,
2018.
(3) Accomplishing Bombardier Repair Drawing 8/4-28-018, Issue 1,
dated October 30, 2017; Issue 2, dated June 12, 2018; Issue 3, dated
June 21, 2018; or Issue 04, dated July 27, 2018, is an alternative
method of compliance (AMOC) only for the replacement of the affected
single nut plate brackets and standoffs on the motive flow line and
vent line at LH and RH wing stations Yw <plus-minus> 209.019 and Yw
<plus-minus> 317.019 required by paragraph (h)(2) of this AD.
(4) Accomplishing Bombardier Repair Drawing 8/4-28-018, Issue 1,
dated October 30, 2017; Issue 2, dated June 12, 2018; Issue 3, dated
June 21, 2018; or Issue 04, dated July 27, 2018, prior to the
effective date of this AD, along with the replacement of the
[[Page 16665]]
affected single nut plate brackets and standoffs on the motive flow
line, vent line, pressure relief line, and scavenge line at LH and
RH wing stations Yw <plus-minus> 209.019, Yw <plus-minus> 317.019,
and Yw <plus-minus> 371.019, is an acceptable method of compliance
for the actions required by paragraph (h)(2) of this AD.
(5) For airplanes having S/N 4001 and 4003 through 4533
inclusive, on which Bombardier Service Bulletin 84-28-19, dated
August 16, 2016; or Revision A, dated November 4, 2016, has been
done: Within 6,000 flight hours or 36 months after the effective
date of this AD, whichever occurs first, inspect the motive flow
line and vent line at wing stations -371.019 and 371.019 in the LH
and RH fuel tanks, respectively, to ensure that these fuel tubes are
adequately supported, and inspect the fuel tubes to verify that an
appropriate clearance has been maintained between the fuel tubes and
their support brackets, in accordance with paragraph 3.B., step
(13), and paragraph 3.C., of Bombardier Service Bulletin 84-28-19,
Revision D, dated February 16, 2018.
(6) For airplanes having S/N 4001 and 4003 through 4572
inclusive: Within 8,000 flight hours or 48 months after the
effective date of this AD, whichever occurs first, install
Teflon<SUP>TM</SUP> sleeves on the vent line at wing stations Yw
<plus-minus> 209.019 and Yw <plus-minus> 371.019 in the LH and RH
fuel tanks, inspect the Teflon<SUP>TM</SUP> sleeve installation on
the vent line at wing stations Yw <plus-minus> 317.019 in the LH and
RH fuel tanks, and if any sleeve is incorrectly installed,
reposition the Teflon<SUP>TM</SUP> sleeves before further flight, in
accordance with paragraphs 3.B. and 3.C. of the Accomplishment
Instructions of Bombardier Service Bulletin 84-28-24, dated November
27, 2017.
(7) Prior to accomplishment of the actions required by paragraph
(h)(6) of this AD, the applicable actions specified in paragraph
(h)(2) or (5) of this AD must be done. Accomplishment of Bombardier
Modification Summary (ModSum) 4Q113904 on an airplane prior to the
effective date of this AD is acceptable for compliance with this
paragraph.
(8) For airplanes having S/N 4001 and 4003 through 4575
inclusive: Within 8,000 flight hours or 48 months after the
effective date of this AD, whichever occurs first, inspect the
Teflon<SUP>TM</SUP> sleeve installation on the vent line in the LH
and RH fuel tanks for correct installation and damage, and if the
sleeves are incorrectly installed or damage is found, before further
flight, replace and reposition the Teflon<SUP>TM</SUP> sleeves, as
applicable, in accordance with paragraphs 3.B. and 3.C. of the
Accomplishment Instructions of Bombardier Service Bulletin 84-28-25,
dated November 27, 2017.
(9) Prior to accomplishment of the actions required by paragraph
(h)(8) of this AD, the applicable actions specified in paragraph
(h)(2) or (5) of this AD must be done. Accomplishment of Bombardier
ModSum 4Q113904 on an airplane prior to the effective date of this
AD is acceptable for compliance with this paragraph.
(i) Verification and Rework for Existing Maintenance Program
(1) For airplanes having S/N 4001 and 4003 through 4575
inclusive, on which the actions required by paragraph (h)(6) or (8)
of this AD have been done before the effective date of this AD, or
that have complied with paragraph (m)(4) of this AD: Within 60 days
after the effective date of this AD, review the airplane maintenance
records to confirm if any of the prohibited tasks (defined in
paragraph (g) of this AD) were accomplished during or after
compliance with paragraph (h)(6) or (8) of this AD or paragraph
(m)(4) of this AD.
(i) If any of the prohibited tasks were accomplished during or
after compliance with paragraph (h)(6) or (m)(4) of this AD, or if
it cannot be conclusively confirmed that they were not accomplished
during or after compliance with paragraph (h)(6) or paragraph (m)(4)
of this AD: Within 8,000 flight hours or 48 months after the
effective date of this AD, whichever occurs first, do the actions
required by paragraph (h)(6) of this AD and, as applicable, comply
with the requirements of paragraph (h)(7) of this AD.
(ii) If any of the prohibited tasks were accomplished during or
after compliance with paragraph (h)(8) of this AD, or if it cannot
be conclusively confirmed that they were not accomplished during or
after compliance with paragraph (h)(8) of this AD: Within 8,000
flight hours or 48 months after the effective date of this AD,
whichever occurs first, do the actions required by paragraph (h)(8)
of this AD and, as applicable, comply with the requirements of
paragraph (h)(9) of this AD.
(2) For airplanes having S/N 4573 and subsequent, with an
airplane date of manufacture, as identified on the identification
plate of the airplane, dated before the effective date of this AD:
Within 60 days after the effective date of this AD, review the
airplane maintenance records to confirm if any of the prohibited
tasks (defined in paragraph (g) of this AD) were accomplished on or
after the airplane date of manufacture. If any of the prohibited
tasks were accomplished on or after the airplane date of
manufacture, or if it cannot be conclusively confirmed that they
were not accomplished on or after the airplane date of manufacture,
within 8,000 flight hours or 48 months after the effective date of
this AD, whichever occurs first, obtain and follow instructions for
rework 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.
(j) Maintenance or Inspection Program Revision
For all airplanes: Within 30 days after the effective date of
this AD, revise the existing maintenance or inspection program, as
applicable, to incorporate the information specified in (Bombardier)
Q400 Dash 8 Temporary Revision (TR) ALI-0192 and TR ALI-0193, both
dated April 24, 2018, into Section 4--28 Fuel System Limitation, or
Section 5--00 Critical Design Configuration Control Limitations, as
applicable, of Part 2, of the Bombardier Q400 Dash 8 Maintenance
Requirements Manual, PSM 1-84-7. The initial compliance time for
doing the tasks in (Bombardier) Q400 Dash 8 TR ALI-0192, dated April
24, 2018, is at the applicable time specified in paragraph (j)(1) or
(2) of this AD, whichever occurs later:
(1) Prior to the accumulation of 18,000 total flight cycles or
within 108 months since issuance of the original airworthiness
certificate or original export certificate of airworthiness,
whichever occurs first.
(2) Within 90 days after the effective date of this AD.
(k) No Alternative Actions, Intervals, or Critical Design Configuration
Control Limitations (CDCCLs)
After the existing maintenance or inspection program has been
revised as required by paragraph (j) of this AD, no alternative
actions (e.g., inspections), intervals, or CDCCLs may be used unless
the actions, intervals, and CDCCLs are approved as an AMOC in
accordance with the procedures specified in paragraph (n)(1) of this
AD.
(l) Maintenance Task Prohibitions
For all airplanes: As of the effective date of this AD, comply
with the prohibitions specified in paragraphs (l)(1) and (2) of this
AD.
(1) It is prohibited to use the Bombardier airplane maintenance
manual (AMM) tasks identified in paragraphs (l)(1)(i) through (v) of
this AD, which are specified in the Bombardier Q400 Dash 8 AMM, PSM
1-84-2, Revision 59 dated October 5, 2017, or earlier revisions of
these tasks. TRs including these AMM tasks, dated November 27, 2017,
or earlier, are also prohibited for use except as specified in
paragraph (l)(1)(i) through (v) of this AD.
(i) Task 28-10-00-280-806 Detailed Inspection of the
Teflon<SUP>TM</SUP> Sleeve on the Fuel Tank Vent Line, LH and RH
(FSL#284000-406), with the exception of (Bombardier) Q400 Dash 8 AMM
TR 28-145, dated November 21, 2017.
(ii) Task 28-12-06-000-801 Removal of the Outboard Vent Line,
with the exception of (Bombardier) Q400 Dash 8 AMM TR 28-146, dated
November 21, 2017.
(iii) Task 28-12-06-400-801 Installation of the Outboard Vent
Line, with the exception of (Bombardier) Q400 Dash 8 AMM TR 28-147,
dated November 21, 2017.
(iv) Task 28-12-01-000-801 Removal of the Inboard Vent Line,
with the exception of (Bombardier) Q400 Dash 8 AMM TR 28-148, dated
November 24, 2017.
(v) Task 28-12-01-400-801 Installation of the Inboard Vent Line,
with the exception of (Bombardier) Q400 Dash 8 AMM TR 28-149, dated
November 27, 2017.
(2) It is prohibited to use the Bombardier Q400 Dash 8
Maintenance Task Card Manual (MTCM) task cards identified in
paragraphs (l)(2)(i) and (ii) of this AD that are specified in the
Bombardier Q400 Dash 8 MTCM, PSM 1-84-7TC, Revision 42 dated
November 5, 2017, or earlier revisions or amendments of these task
cards. MTCM task card revisions or amendments dated November 21,
2017, or earlier, are also prohibited for use, except as specified
in paragraphs (l)(2)(i) and (ii) of this AD.
[[Page 16666]]
(i) Bombardier Q400 Dash 8 MTCM Maintenance Task Card 000-28-
520-704 (Config A01), Detailed Inspection of the Teflon<SUP>TM</SUP>
Sleeve on the Fuel Tank Vent Line (LH), with the exception of
(Bombardier) Q400 Dash 8 MTCM Maintenance Task Card 000-28-520-704
(Config A01), Detailed Inspection of the Teflon<SUP>TM</SUP> Sleeve
on the Fuel Tank Vent Line (LH), Revision 42, Amendment 0002, dated
November 21, 2017.
(ii) Bombardier Q400 Dash 8 MTCM Maintenance Task Card 000-28-
620-704 (Config A01), Detailed Inspection of the Teflon<SUP>TM</SUP>
Sleeve on the Fuel Tank Vent Line (RH), with the exception of
(Bombardier) Q400 Dash 8 MTCM Maintenance Task Card 000-28-620-704
(Config A01), Detailed Inspection of the Teflon<SUP>TM</SUP> Sleeve
on the Fuel Tank Vent Line (RH), Revision 42, Amendment 0002, dated
November 21, 2017.
(m) Credit for Previous Actions
(1) This paragraph provides credit for actions required by
paragraph (h)(1) of this AD, if those actions were performed before
the effective date of this AD using Bombardier Service Bulletin 84-
28-18, dated April 20, 2016; or Revision A, dated November 14, 2016.
(2) This paragraph provides credit for actions required by
paragraph (h)(2) of this AD, if those actions were performed before
the effective date of this AD using Bombardier Service Bulletin 84-
28-19, Revision B, dated July 28, 2017, or Revision C, dated
September 1, 2017.
(3) This paragraph provides credit for actions required by
paragraph (h) (5) of this AD, if those actions were performed before
the effective date of this AD using paragraphs 3.A. and 3.C and
paragraph 3.B., step (13) of Bombardier Service Bulletin 84-28-19,
Revision B, dated July 28, 2017, or Revision C, dated September 1,
2017
(4) This paragraph provides credit for actions required by
paragraph (h)(6) of this AD, if, before the effective date of this
AD, the ModSums identified in paragraph (m)(4)(i), (ii), or (iii) of
this AD were incorporated, and provided the conditions identified in
figure 1 to paragraph (m)(4) of this AD have been met.
[GRAPHIC] [TIFF OMITTED] TP24MR22.057
(i) Incorporation of both a modsum identified in paragraph
(m)(4)(i)(A) of this AD and a modsum identified in paragraph
(m)(4)(i) (B) of this AD.
(A) One of the modsums identified in paragraphs (m)(4)(i)(A)(1)
through (9) of this AD.
(1) Bombardier ModSum IS4Q2800023, Revision A, dated February 7,
2017.
(2) Bombardier ModSum IS4Q2800023, Revision B, dated April 11,
2017.
(3) Bombardier ModSum IS4Q2800023, Revision C, dated August 30,
2017.
(4) Bombardier ModSum IS4Q2800023, Revision D, dated October 11,
2017.
(5) Bombardier ModSum IS4Q2800023, Revision E, dated October 19,
2017.
(6) Bombardier ModSum IS4Q2800023, Revision F, dated October 20,
2017.
(7) Bombardier ModSum IS4Q2800023, Revision G, dated November
24, 2017.
(8) Bombardier ModSum IS4Q2800023, Revision H, dated November
29, 2017.
(9) Bombardier ModSum IS4Q2800023, Revision J, dated December
12, 2017.
(B) One of the modsums identified in paragraphs (m)(4)(i)(B)(1)
through (5) of this AD.
(1) Bombardier ModSum IS4Q2800025, Revision A, dated October 20,
2017.
(2) Bombardier ModSum IS4Q2800025, Revision B, dated November 3,
2017.
(3) Bombardier ModSum IS4Q2800025, Revision C, dated November
21, 2017.
(4) Bombardier ModSum IS4Q2800025, Revision D, dated November
23, 2017.
(5) Bombardier ModSum IS4Q2800025, Revision E, dated November
29, 2017.
(ii) Incorporation of both a modsum identified in paragraph
(m)(4)(ii)(A) of this AD and a modsum identified in paragraph
(m)(4)(ii)(B) of this AD.
(A) Bombardier ModSum IS4Q2800030, Revision A, dated November 3,
2017; or Bombardier ModSum IS4Q2800030, Revision B, dated November
21, 2017.
(B) One of the modsums identified in paragraphs (m)(4)(ii)(B)(1)
through (5) of this AD.
(1) Bombardier ModSum IS4Q2800025, Revision A, dated October 20,
2017.
(2) Bombardier ModSum IS4Q2800025, Revision B, dated November 3,
2017.
(3) Bombardier ModSum IS4Q2800025, Revision C, dated November
21, 2017.
(4) Bombardier ModSum IS4Q2800025, Revision D, dated November
23, 2017,
(5) Bombardier ModSum IS4Q2800025, Revision E, dated November
29, 2017.
(iii) Incorporation of a modsum identified in paragraphs
(m)(4)(iii)(A) through (C) of this AD.
(A) Bombardier ModSum IS4Q2800027, Revision A, dated October 27,
2017.
(B) Bombardier ModSum IS4Q2800027, Revision B, dated November 9,
2017.
(C) Bombardier ModSum IS4Q2800027, Revision C, dated November
15, 2017.
(n) 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,
[[Page 16667]]
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 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.
(o) Related Information
(1) Refer to Mandatory Continuing Airworthiness Information
(MCAI) TCCA AD CF-2017-05R2, dated September 20, 2019, for related
information. This MCAI may be found in the AD docket on the internet
at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and locating Docket
No. FAA-2022-0287.
(2) For more information about this AD, contact Joseph
Catanzaro, Aerospace Engineer, Airframe and Propulsion Section, FAA,
New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; telephone 516-228-7366; email <a href="/cdn-cgi/l/email-protection#edd4c08c9b9ec083948c8e82c08e829ead8b8c8cc38a829b"><span class="__cf_email__" data-cfemail="7a43571b0c095714031b1915571915093a1c1b1b541d150c">[email protected]</span></a>.
(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 <a href="/cdn-cgi/l/email-protection#51253935113534393027383d3d303f357f323e3c"><span class="__cf_email__" data-cfemail="f3879b97b397969b92859a9f9f929d97dd909c9e">[email protected]</span></a>; internet
<a href="https://dehavilland.com">https://dehavilland.com</a>. 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 March 15, 2022.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification
Service.
[FR Doc. 2022-05964 Filed 3-23-22; 8:45 am]
BILLING CODE 4910-13-P
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