[Federal Register Volume 87, Number 186 (Tuesday, September 27, 2022)]
[Rules and Regulations]
[Pages 58439-58445]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2022-20805]


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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; 
Amendment 39-22142; AD 2022-17-04]
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.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for 
certain De Havilland Aircraft of Canada Limited Model DHC-8-400 series 
airplanes. 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 TeflonTM sleeves. This AD was also 
prompted by a determination that new or more restrictive airworthiness 
limitations are necessary. This AD requires inspecting the motive flow 
line, vent line, and related parts, and adding support or additional 
clearance if necessary. This AD also requires inspection, and 
replacement or relocation if necessary, of affected TeflonTM 
sleeves on the vent line, and installation of TeflonTM 
sleeves on the vent line at additional wing stations. This AD also 
requires revising the existing maintenance or inspection

[[Page 58440]]

program, as applicable, to incorporate new or more restrictive 
airworthiness limitations. The FAA is issuing this AD to address the 
unsafe condition on these products.

DATES: This AD is effective November 1, 2022.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of November 1, 
2022.

ADDRESSES: For service information identified in this final rule, 
contact De Havilland Aircraft of Canada Limited, Dash 8 Series Customer 
Response Centre, 5800 Explorer Drive, Mississauga, Ontario, L4W 5K9, 
Canada; telephone 855-310-1013 or 647-277-5820; email 
dehavilland.com">[email protected]dehavilland.com; internet 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 at www.regulations.gov by searching for 
and locating Docket No. FAA-2022-0287.

Examining the AD Docket

    You may examine the AD docket at www.regulations.gov 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 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: 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 [email protected].

SUPPLEMENTARY INFORMATION:

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 www.regulations.gov by searching for and locating 
Docket No. FAA-2022-0287.
    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-8-400 series airplanes. The NPRM 
published in the Federal Register on March 24, 2022 (87 FR 16661). The 
NPRM 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 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. 
This may also have led to incorrect installation of certain 
TeflonTM sleeves. The NPRM was also prompted by a 
determination that new or more restrictive airworthiness limitations 
are necessary. The NPRM proposed to require inspecting the motive flow 
line, vent line, and related parts, and adding support or additional 
clearance if necessary. The NPRM also proposed to require inspection, 
and replacement or relocation if necessary, of affected 
TeflonTM sleeves on the vent line, and installation of 
TeflonTM sleeves on the vent line at additional wing 
stations. The NPRM further proposed to require revising the existing 
maintenance or inspection program, as applicable, to incorporate new or 
more restrictive airworthiness limitation. 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. See the MCAI for 
additional background information.

Discussion of Final Airworthiness Directive

Comments

    The FAA received comments from the Air Line Pilots Association, 
International, (ALPA), who supported the NPRM without change.
    The FAA received additional comments from Horizon Air. The 
following presents the comments received on the NPRM and the FAA's 
response.

Request To Specify the Latest Revision of the Maintenance Manual

    Horizon Air asked that paragraph (j) of the proposed AD be revised 
to require Bombardier Q400 Dash 8 Maintenance Requirements Manual 
(MRM), PSM 1-84-7, Revision 9, dated July 10, 2018. Horizon Air stated 
that paragraph (j) of the proposed AD mandates incorporation of 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. 
Horizon Air added that the TRs have been incorporated and the 
maintenance manual is currently at Revision 9.
    The FAA agrees to clarify. Paragraph (j) of this AD requires 
operators to incorporate ``the information specified in'' (Bombardier) 
Q400 Dash 8 TR ALI-0192 and TR ALI-0193, both dated April 24, 2018. The 
information is the same in both Bombardier Q400 Dash 8 Maintenance 
Requirements Manual (MRM), PSM 1-84-7, Revision 9, dated July 10, 2018, 
and TR ALI-0192 and TR ALI-0193. Therefore, if operators incorporate 
Bombardier Q400 Dash 8 Maintenance Requirements Manual (MRM), PSM 1-84-
7, Revision 9, dated July 10, 2018, into the maintenance or inspection 
program, as applicable, they are in compliance with paragraph (j) of 
this AD (i.e., since the information specified in Bombardier Q400 Dash 
8 Maintenance Requirements Manual (MRM), PSM 1-84-7, Revision 9, dated 
July 10, 2018, contains the same information as TR ALI-0192 and TR ALI-
0193, both dated April 24, 2018, the operator is complying with the 
requirement to incorporate the information specified in the TRs). The 
FAA has not changed this AD in this regard.

Changes Made to This AD

    The FAA has revised paragraph (h)(4) of this AD to more accurately 
identify the actions specified in that paragraph as a method of 
compliance for the actions required by paragraph (h)(2) of this AD.
    The FAA has also revised paragraphs (h)(7) and (9) of this AD to 
update the language providing credit for the actions required by those 
paragraphs.
    These changes have not changed the intent of these paragraphs.

[[Page 58441]]

Conclusion

    The FAA reviewed the relevant data and determined that air safety 
requires adopting this AD as proposed. Except for minor editorial 
changes, and any other changes described previously, 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 the following 
Bombardier service information.
     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.
     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.
     Bombardier Service Bulletin 84-28-24, dated November 27, 
2017, which describes procedures for installing Teflon TM 
sleeves on the vent line at the specified wing stations in the LH and 
RH fuel tanks, inspecting the Teflon TM sleeve installation 
on the vent line at those wing stations in the LH and RH fuel tanks, 
and repositioning the Teflon TM sleeves.
     Bombardier Service Bulletin 84-28-25, dated November 27, 
2017, which describes procedures for inspecting the Teflon 
TM sleeve installation on the vent line in the LH and RH 
fuel tanks for correct installation and damage, and replacing and 
repositioning the Teflon TM 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.
     Bombardier Repair Drawing 8/4-28-018, Issue 1, dated 
October 30, 2017.
     Bombardier Repair Drawing 8/4-28-018, Issue 2, dated June 
12, 2018.
     Bombardier Repair Drawing 8/4-28-018, Issue 3, dated June 
21, 2018.
     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.
     Q400 Dash 8 Maintenance Requirements Manual (MRM) TR ALI-
0192, dated April 24, 2018.
     Q400 Dash 8 MRM TR ALI-0193, dated April 24, 2018.
    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.
     Q400 Dash 8 Airplane Maintenance Manual (AMM) TR 28-145, 
dated November 21, 2017.
     Q400 Dash 8 AMM TR 28-146, dated November 21, 2017.
     Q400 Dash 8 AMM TR 28-147, dated November 21, 2017.
     Q400 Dash 8 AMM TR 28-148, dated November 24, 2017.
     Q400 Dash 8 AMM TR 28-149, dated November 27, 2017.
     Q400 Dash 8 Maintenance Task Card Manual (MTCM), 
Maintenance Task Card 000-28-520-704 (Config A01), Revision 42, 
Amendment 0002, dated November 21, 2017.
     Q400 Dash 8 MTCM, Maintenance Task Card 000-28-620-704 
(Config A01), 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.

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 *
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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 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.

[[Page 58442]]

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

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:

2022-17-04 De Havilland Aircraft of Canada Limited (Type Certificate 
Previously Held by Bombardier, Inc.): Amendment 39-22142; Docket No. 
FAA-2022-0287; Project Identifier MCAI-2020-01602-T.

(a) Effective Date

    This airworthiness directive (AD) is effective November 1, 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 TeflonTM 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 4, dated July 27, 2018; is a method of 
compliance (MOC) 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  209.019 and Yw  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 4, dated July 27, 2018; prior to the 
effective date of this AD, along with 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  209.019, Yw  317.019, 
and Yw  371.019, is acceptable for 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 
TeflonTM sleeves on the vent line at wing stations Yw 
 209.019 and Yw  371.019 in the LH and RH 
fuel tanks, inspect the TeflonTM sleeve installation on 
the vent line at wing stations Yw  317.019 in the LH and 
RH fuel tanks, and if any sleeve is incorrectly installed, 
reposition the TeflonTM 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. For airplanes on which 
Bombardier Modification Summary (ModSum) 4Q113904 has been 
accomplished prior to accomplishment of the actions required by 
paragraph (h)(6) of this AD, no further action is required by 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 
TeflonTM 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 TeflonTM 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. For airplanes on which 
Bombardier ModSum 4Q113904 has been accomplished prior to 
accomplishment of the actions required by paragraph (h)(8) of this 
AD, no further action is required by 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

[[Page 58443]]

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 Maintenance Requirements Manual (MRM) Temporary Revision 
(TR) ALI-0192 and TR ALI-0193, both dated April 24, 2018. The 
initial compliance time for doing the tasks in (Bombardier) Q400 
Dash 8 MRM 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 
TeflonTM 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.
    (i) Bombardier Q400 Dash 8 MTCM, Maintenance Task Card 000-28-
520-704 (Config A01), Revision 42, Amendment 0002, dated November 
21, 2017.
    (ii) Bombardier Q400 Dash 8 MTCM, Maintenance Task Card 000-28-
620-704 (Config A01), 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.

[[Page 58444]]

[GRAPHIC] [TIFF OMITTED] TR27SE22.019

    (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, 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 at 
www.regulations.gov 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 [email protected].
    (3) Service information identified in this AD that is not 
incorporated by reference is available at the addresses specified in 
paragraphs (p)(3) and (4) of this AD.

(p) 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) Bombardier Repair Drawing 8/4-28-018, Issue 1, dated October 
30, 2017.
    (ii) Bombardier Repair Drawing 8/4-28-018, Issue 2, dated June 
12, 2018.
    (iii) Bombardier Repair Drawing 8/4-28-018, Issue 3, dated June 
21, 2018.
    (iv) Bombardier Repair Drawing 8/4-28-018, Issue 4, dated July 
27, 2018.
    (v) Bombardier Service Bulletin 84-28-18, Revision B, dated 
April 20, 2017.

[[Page 58445]]

    (vi) Bombardier Service Bulletin 84-28-19, Revision D, dated 
February 16, 2018.
    (vii) Bombardier Service Bulletin 84-28-24, dated November 27, 
2017.
    (viii) Bombardier Service Bulletin 84-28-25, dated November 27, 
2017.
    (ix) Q400 Dash 8 Airplane Maintenance Manual (AMM) TR 28-145, 
dated November 21, 2017.

    Note 1 to paragraph (p)(2)(ix): The documents identified in 
paragraphs (p)(2)(ix) through (xvii) of this AD do not specify a 
publisher name; these documents were published by Bombardier.

    (x) Q400 Dash 8 AMM TR 28-146, dated November 21, 2017.
    (xi) Q400 Dash 8 AMM TR 28-147, dated November 21, 2017.
    (xii) Q400 Dash 8 AMM TR 28-148, dated November 24, 2017.
    (xiii) Q400 Dash 8 AMM TR 28-149, dated November 27, 2017.
    (xiv) Q400 Dash 8 Maintenance Task Card Manual (MTCM), 
Maintenance Task Card 000-28-520-704 (Config A01), Revision 42, 
Amendment 0002, dated November 21, 2017.
    (xv) Q400 Dash 8 MTCM, Maintenance Task Card 000-28-620-704 
(Config A01), Revision 42, Amendment 0002, dated November 21, 2017.
    (xvi) Q400 Dash 8 Maintenance Requirements Manual (MRM) TR ALI-
0192, dated April 24, 2018.
    (xvii) Q400 Dash 8 MRM TR ALI-0193, dated April 24, 2018.
    (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 855-310-1013 or 647-277-5820; email 
dehavilland.com">[email protected]dehavilland.com; internet dehavilland.com.
    (4) 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.
    (5) You may view this service information that is incorporated 
by reference at the National Archives and Records Administration 
(NARA). For information on the availability of this material at 
NARA, email [email protected], or go to: www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on August 4, 2022.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2022-20805 Filed 9-26-22; 8:45 am]
BILLING CODE 4910-13-P


