Proposed Rule2022-12265
Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
June 9, 2022
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to supersede Airworthiness Directive (AD) 2020-04-20, which applies to certain De Havilland Aircraft of Canada Limited Model DHC-8-400 series airplanes. AD 2020-04-20 requires repetitive inspections of certain parts for discrepancies that meet specified criteria, and replacement as necessary; repetitive inspections of certain parts for damage and wear, and rework of parts; and electrical bonding checks of certain couplings. AD 2020-04-20 also requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. For certain airplanes, AD 2020-04-20 allows a modification that would terminate the repetitive inspections. Since the FAA issued AD 2020-04-20, the FAA has determined that a more robust lightning ignition protection design is necessary and that additional airplanes are affected by the unsafe condition. This proposed AD would continue to require the actions in AD 2020-04-20, revise the applicability by adding airplanes, and require, for certain airplanes, the previously optional rework and retrofit of certain parts of the fuel system. Doing the rework and retrofit would terminate the retained initial and repetitive inspections in this AD. 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 111 (Thursday, June 9, 2022)</title>
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[Federal Register Volume 87, Number 111 (Thursday, June 9, 2022)]
[Proposed Rules]
[Pages 35128-35132]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-12265]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2022-0672; Project Identifier MCAI-2020-01606-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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SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD)
2020-04-20, which applies to certain De Havilland Aircraft of Canada
Limited Model DHC-8-400 series airplanes. AD 2020-04-20 requires
repetitive inspections of certain parts for discrepancies that meet
specified criteria, and replacement as necessary; repetitive
inspections of certain parts for damage and wear, and rework of parts;
and electrical bonding checks of certain couplings. AD 2020-04-20 also
requires revising the existing maintenance or inspection program, as
applicable, to incorporate new or more restrictive airworthiness
limitations. For certain airplanes, AD 2020-04-20 allows a modification
that would terminate the repetitive inspections. Since the FAA issued
AD 2020-04-20, the FAA has determined that a more robust lightning
ignition protection design is necessary and that additional airplanes
are affected by the unsafe condition. This proposed AD would continue
to require the actions in AD 2020-04-20, revise the applicability by
adding airplanes, and require, for certain airplanes, the previously
optional rework and retrofit of certain parts of the fuel system. Doing
the rework and retrofit would terminate the retained initial and
repetitive inspections in this AD. 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 July 25,
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#70041814301415181106191c1c111e145e131f1d"><span class="__cf_email__" data-cfemail="c5b1ada185a1a0ada4b3aca9a9a4aba1eba6aaa8">[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 on the internet at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and locating Docket No. FAA-2022-
0672; 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,
[[Page 35129]]
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#88b1a5e9fefba5e6f1e9ebe7a5ebe7fbc8eee9e9a6efe7fe"><span class="__cf_email__" data-cfemail="90a9bdf1e6e3bdfee9f1f3ffbdf3ffe3d0f6f1f1bef7ffe6">[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-2022-0672; Project Identifier
MCAI-2020-01606-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 proposed AD.
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#f4cdd9958287d99a8d95979bd9979b87b4929595da939b82"><span class="__cf_email__" data-cfemail="370e1a5641441a594e5654581a5458447751565619505841">[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.
Discussion
The FAA issued AD 2020-04-20, Amendment 39-19857 (61 FR 17473,
March 30, 2020) (AD 2020-04-20), for certain De Havilland Aircraft of
Canada Limited Model DHC-8-400 series airplanes. AD 2020-04-20 requires
repetitive inspections of certain parts for discrepancies that meet
specified criteria, and replacement as necessary; repetitive
inspections of certain parts for damage and wear, and rework of parts;
and electrical bonding checks of certain couplings. AD 2020-04-20 also
requires revising the existing maintenance or inspection program, as
applicable, to incorporate new or more restrictive airworthiness
limitations. For certain airplanes, AD 2020-04-20 allows a modification
that would terminate the repetitive inspections. AD 2020-04-20 resulted
from reports of wear on fuel couplings, bonding springs, and sleeves as
well as fuel tube end ferrules and fuel component end ferrules. The FAA
issued AD 2020-04-20 to address wear on fuel couplings, bonding
springs, and sleeves as well as fuel tube end ferrules and fuel
component end ferrules, which could reduce the integrity of the
electrical bonding paths through the fuel line and components, and
ultimately lead to fuel tank ignition in the event of a lightning
strike.
Actions Since AD 2020-04-20 Was Issued
Since the FAA issued AD 2020-04-20, the FAA has determined that a
more robust lightning ignition protection design is necessary, which
will better mitigate the risk of lightning strike induced fuel tank
ignition through the use of high resistance isolators, a new fuel
coupling design, and improved structural support. Additional airplanes
are also affected by the unsafe condition.
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued TCCA AD CF-2017-04R3, dated April 1,
2020 (also referred to 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 series
airplanes. You may examine the MCAI 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-2022-0672.
This proposed AD was prompted by reports of wear on fuel couplings,
bonding springs, and sleeves as well as fuel tube end ferrules and fuel
component end ferrules, and that a more robust lightning ignition
protection design is necessary. The FAA is proposing this AD to address
wear on fuel couplings, bonding springs, and sleeves as well as fuel
tube end ferrules and fuel component end ferrules, which could reduce
the integrity of the electrical bonding paths through the fuel line and
components, and ultimately lead to 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
This proposed AD would require the following service information,
which the Director of the Federal Register approved for incorporation
by reference as of May 4, 2020 (61 FR 17473, March 30, 2020).
<bullet> Bombardier Service Bulletin 84-28-20, Revision D, dated
November 23, 2018.
<bullet> Bombardier Service Bulletin 84-28-21, Revision C, dated
July 13, 2018.
<bullet> Bombardier Service Bulletin 84-28-26, Revision A, dated
November 29, 2018.
<bullet> Q400 Dash 8 (Bombardier) Temporary Revision ALI-0192,
dated April 24, 2018.
<bullet> Q400 Dash 8 (Bombardier) Temporary Revision ALI-0193,
dated April 24, 2018.
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 Requirements of This NPRM
This proposed AD would retain all of the requirements of AD 2020-
04-20. This proposed AD would also require revising the applicability
by adding airplanes, and for certain airplanes, reworking and
retrofitting certain parts of the fuel system. Doing the rework and
retrofit would terminate the existing initial and repetitive
inspections in this proposed AD.
[[Page 35130]]
Costs of Compliance
The FAA estimates that this proposed AD affects 54 airplanes of
U.S. registry.
The FAA estimates the following costs to comply with this proposed
AD:
Estimated Costs for Required Actions *
--------------------------------------------------------------------------------------------------------------------------------------------------------
Action Labor cost Parts cost Cost per product Cost on U.S. operators
--------------------------------------------------------------------------------------------------------------------------------------------------------
Retained actions from AD 2020-04-20... 268 work-hours x $85 per $0 $22,780........................ $1,230,120.
hour = $22,780.
New proposed actions.................. Up to 1,747 work-hours x 87,385 Up to $235,880................. Up to $12,737,520.
$85 per hour = Up to
$148,495.
--------------------------------------------------------------------------------------------------------------------------------------------------------
* Table does not include estimated costs for revising the existing maintenance or inspection program.
The FAA has determined that revising the existing 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).
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 has 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:
0
a. Removing Airworthiness Directive (AD) 2020-04-20, Amendment 39-19857
(61 FR 17473, March 30, 2020); and
0
b. Adding the following new AD:
De Havilland Aircraft of Canada Limited (Type Certificate previously
held by Bombardier, Inc.): Docket No. FAA-2022-0672; Project
Identifier MCAI-2020-01606-T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by July 25, 2022.
(b) Affected ADs
This AD replaces AD 2020-04-20, Amendment 39-19857 (61 FR 17473,
March 30, 2020) (AD 2020-04-20).
(c) Applicability
This AD applies to De Havilland Aircraft of Canada Limited Model
DHC-8-400, -401, and -402 airplanes, certificated in any category,
manufacturer serial numbers 4001 and 4003 and subsequent.
(d) Subject
Air Transport Association (ATA) of America Code 28, Fuel.
(e) Reason
This AD was prompted by reports of wear on fuel couplings,
bonding springs, and sleeves as well as fuel tube end ferrules and
fuel component end ferrules, and that a more robust lightning
ignition protection design is necessary. The FAA is issuing this AD
to address such wear, which could reduce the integrity of the
electrical bonding paths through the fuel line and components, and
ultimately lead to 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) Retained Initial Inspection Compliance Times, With New Terminating
Action
This paragraph restates the requirements of paragraph (g) of AD
2020-04-20, with new terminating action. For airplanes having serial
numbers 4001 and 4003 through 4575 inclusive that, as of May 4, 2020
(the effective date of AD 2020-04-20), have not done the actions
specified in Bombardier Service Bulletin 84-28-21: At the applicable
times specified in paragraph (g)(1) or (2) of this AD, do the
actions specified in paragraphs (h)(1) and (2) of this AD.
Accomplishing the terminating action required by paragraph (o) of
this AD terminates the initial inspection required by this
paragraph.
(1) For all airplanes except those identified in paragraph
(g)(2) of this AD: Within 6,000 flight hours or 36 months, whichever
occurs first after May 4, 2020 (the effective date of AD 2020-04-
20).
(2) For airplanes with an original airworthiness certificate or
original export certificate of airworthiness issued on or after May
4, 2020 (the effective date of AD 2020-04-20): Within 6,000 flight
hours or 36 months, whichever occurs first after the date of
issuance of the original airworthiness certificate or the date of
issuance of the original export certificate of airworthiness.
[[Page 35131]]
(h) Retained Repetitive Inspections and Corrective Actions, With New
Terminating Action
This paragraph restates the requirements of paragraph (h) of AD
2020-04-20, with new terminating action. For airplanes having serial
numbers 4001 and 4003 through 4575 inclusive that, as of May 4, 2020
(the effective date of AD 2020-04-20), have not done the actions
specified in Bombardier Service Bulletin 84-28-21: At the applicable
times specified in paragraph (g)(1) or (2) of this AD, do the
actions specified in paragraphs (h)(1) and (2) of this AD. Repeat
the actions thereafter at intervals not to exceed 6,000 flight hours
or 36 months, whichever occurs first. Accomplishing the terminating
action required by paragraph (o) of this AD terminates the
repetitive inspections required by this paragraph.
(1) Do a detailed inspection of the clamshell coupling bonding
wires, fuel couplings, and associated sleeves for discrepancies that
meet specified criteria, as identified in, and in accordance with,
paragraph 3.B., ``Procedure,'' of the Accomplishment Instructions of
Bombardier Service Bulletin 84-28-20, Revision D, dated November 23,
2018. If any conditions are found meeting the criteria specified in
Bombardier Service Bulletin 84-28-20, Revision D, dated November 23,
2018, before further flight, replace affected parts with new
couplings and sleeves of the same part number, in accordance with
paragraph 3.B., ``Procedure,'' of the Accomplishment Instructions of
Bombardier Bulletin 84-28-20, Revision D, dated November 23, 2018.
(2) Do a detailed inspection of the fuel tube end ferrules, fuel
component end ferrules, and ferrule O-ring flanges for damage and
wear, and rework (repair, replace, or blend, as applicable) the
parts, in accordance with paragraph 3.B., ``Procedure,'' of the
Accomplishment Instructions of Bombardier Service Bulletin 84-28-20,
Revision D, dated November 23, 2018.
(i) Retained Electrical Bonding Checks/Detailed Inspection, With No
Changes
This paragraph restates the requirements of paragraph (j) of AD
2020-04-20, with no changes. For airplanes having serial numbers
4001, 4003 through 4489 inclusive, and 4491 through 4575 inclusive
that, as of May 4, 2020 (the effective date of AD 2020-04-20), have
done the actions specified in Bombardier Service Bulletin 84-28-21,
Revision A, dated September 29, 2017; and airplanes having serial
numbers 4576 through 4581 inclusive: Within 6,000 flight hours or 36
months after May 4, 2020, whichever occurs first, do the actions
specified in paragraph (i)(1) or (2) of this AD.
(1) Accomplish electrical bonding checks of all threaded
couplings on the inboard vent lines in the left and right wings, in
accordance with paragraph 3.B., ``Procedure,'' of the Accomplishment
Instructions of Bombardier Service Bulletin 84-28-26, Revision A,
dated November 29, 2018.
(2) Do a detailed inspection of the fuel tube end ferrules, fuel
component end ferrules, and ferrule O-ring flanges for damage and
wear, and rework (repair, replace, or blend, as applicable) the
parts; and a retrofit (structural rework) of the fuel couplings,
isolators, and structural provisions; in accordance with paragraph
3.B., ``Procedure,'' of the Accomplishment Instructions of
Bombardier Service Bulletin 84-28-21, Revision C, dated July 13,
2018.
(j) Retained Revision of the Existing Maintenance or Inspection
Program, With No Changes
This paragraph restates the requirements of paragraph (k) of AD
2020-04-20, with no changes. Within 30 days after May 4, 2020 (the
effective date of AD 2020-04-20), revise the existing maintenance or
inspection program, as applicable, to incorporate the information
specified in Q400 Dash 8 (Bombardier) Temporary Revision ALI-0192,
dated April 24, 2018; and Q400 Dash 8 (Bombardier) Temporary
Revision ALI-0193, dated April 24, 2018. Except as specified in
paragraph (k) of this AD, the initial compliance time for doing the
tasks in Q400 Dash 8 (Bombardier) Temporary Revision ALI-0192, dated
April 24, 2018, is at the time specified in Q400 Dash 8 (Bombardier)
Temporary Revision ALI-0192, dated April 24, 2018, or within 30 days
after May 4, 2020, whichever occurs later.
(k) Retained Initial Compliance Time for Task 284000-419, With No
Changes
This paragraph restates the requirements of paragraph (l) of AD
2020-04-20, with no changes. The initial compliance time for task
284000-419 is at the time specified in paragraph (k)(1) or (2) of
this AD, as applicable, or within 30 days after May 4, 2020 (the
effective date of AD 2020-04-20), whichever occurs later.
(1) For airplanes having serial numbers 4001 and 4003 through
4575 inclusive: Within 18,000 flight hours or 108 months, whichever
occurs first, after the earliest date of embodiment of Bombardier
Service Bulletin 84-28-21 on the airplane.
(2) For airplanes having serial numbers 4576 and subsequent:
Within 18,000 flight hours or 108 months, whichever occurs first,
from the date of issuance of the original airworthiness certificate
or original export certificate of airworthiness.
(l) Retained No Alternative Actions, Intervals, or Critical Design
Configuration Control Limitations (CDCCLs), With No Changes
This paragraph restates the requirements of paragraph (m) of AD
2020-04-20, with no changes. 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 alternative method of compliance (AMOC) in accordance
with the procedures specified in paragraph (p)(1) of this AD.
(m) Retained No Reporting Provisions, With No Changes
This paragraph restates the provisions of paragraph (n) of AD
2020-04-20, with no changes. Although Bombardier Service Bulletin
84-28-20, Revision D, dated November 23, 2018, specifies to submit
certain information to the manufacturer, this AD does not include
that requirement.
(n) Retained Credit for Previous Actions, With No Changes
(1) This paragraph restates the requirements of paragraph (o) of
AD 2020-04-20, with no changes. This paragraph provides credit for
the actions required by paragraphs (h)(1) and (2) of this AD, if
those actions were performed before May 4, 2020 (the effective date
of AD 2020-04-20), using the service information specified in
paragraph (n)(1)(i) through (iii) of this AD.
(i) Bombardier Service Bulletin 84-28-20, Revision A, dated
December 14, 2016.
(ii) Bombardier Service Bulletin 84-28-20, Revision B, dated
February 13, 2017.
(iii) Bombardier Service Bulletin 84-28-20, Revision C, dated
April 28, 2017.
(2) For the airplane having serial number 4164, this paragraph
provides credit for the initial inspections required by paragraphs
(h)(1) and (2) of this AD, if those actions were performed before
May 4, 2020 (the effective date of AD 2020-04-20), using Bombardier
Service Bulletin 84-28-20, dated September 30, 2016.
(3) This paragraph provides credit for the actions specified in
paragraph (o) of this AD if those actions were performed before May
4, 2020 (the effective date of AD 2020-04-20), using the service
information specified in paragraph (n)(3)(i) through (v) of this AD.
(i) Bombardier Service Bulletin 84-28-21, dated August 31, 2017.
(ii) Bombardier Service Bulletin 84-28-21, Revision A, dated
September 29, 2017, in combination with incorporating the
information specified in Bombardier Modification Summary Package
(ModSum) IS4Q2800032, Revision A, dated February 1, 2018.
(iii) Bombardier Service Bulletin 84-28-21, Revision A, dated
September 29, 2017, in combination with incorporating any of the
applicable airworthiness limitation change request (ACR) specified
in figure 1 to paragraph (n)(6)(ii) of this AD.
(iv) Bombardier Service Bulletin 84-28-21, Revision B, dated
June 8, 2018.
(4) This paragraph provides credit for the actions required by
paragraph (i)(1) of this AD if those actions were performed before
May 4, 2020 (the effective date of AD 2020-04-20), using Bombardier
Service Bulletin 84-28-26, dated August 14, 2018.
(5) This paragraph provides credit for the actions required by
paragraph (i)(2) of this AD if those actions were performed before
May 4, 2020 (the effective date of AD 2020-04-20), using Bombardier
Service Bulletin 84-28-21, Revision B, dated June 8, 2018.
(6) For airplanes having serial numbers 4001, 4003 through 4489
inclusive, and 4491 through 4575 inclusive, and that are post
Bombardier Service Bulletin 84-28-21, Revision A, dated September
29, 2017: This paragraph provides credit for the actions required by
paragraph (i) of this AD if those actions were performed before May
4, 2020 (the effective date of AD 2020-04-20), using the service
information specified in paragraph (n)(6)(i) or (ii) of this AD.
(i) Bombardier Modification Summary Package (ModSum)
IS4Q2800032, dated February 1, 2018.
[[Page 35132]]
(ii) Any ACR specified in figure 1 to paragraph (n)(6)(ii) of
this AD.
[GRAPHIC] [TIFF OMITTED] TP09JN22.009
(o) Rework and Retrofit
For airplanes having serial numbers 4001, 4003 through 4489
inclusive, and 4491 through 4575 inclusive, that have accomplished
the actions specified in Bombardier Service Bulletin 84-28-21,
Revision A, dated September 29, 2017, but have not incorporated the
information in Bombardier Modification Summary Package (ModSum)
IS4Q2800032, Revision A, dated February 1, 2018, or have not
incorporated any of the applicable ACR specified in figure 1 to
paragraph (n)(6)(ii) of this AD: At the applicable time specified in
paragraph (o)(1) or (2) of this AD, rework (repair, replace, or
blend, as applicable) the parts (fuel tube end ferrules, fuel
component end ferrules, and ferrule O-ring flanges); and do a
retrofit (structural rework) of the fuel couplings, isolators, and
structural provisions; in accordance with Part B of paragraph 3.B.,
``Procedure,'' of the Accomplishment Instructions of Bombardier
Service Bulletin 84-28-21, Revision C, dated July 13, 2018.
Accomplishing these actions terminates the initial and repetitive
inspections required by paragraphs (g) and (h) of this AD.
(1) For airplanes with greater than 20,000 total flight hours as
of the effective date of this AD: Do the actions within 6,000 flight
hours or 36 months after the effective date of this AD, whichever
occurs first.
(2) For airplanes with less than or equal to 20,000 total flight
hours as of the effective date of this AD: Do the actions within
8,000 flight hours or 48 months after the effective date of this AD,
whichever occurs first.
(p) Other FAA AD Provisions
(1) Alternative Methods of Compliance (AMOCs): The Manager, New
York ACO Branch, FAA, has the authority to approve AMOCs for this
AD, if requested using the procedures found in 14 CFR 39.19. In
accordance with 14 CFR 39.19, send your request to your principal
inspector or responsible Flight Standards Office, as appropriate. If
sending information directly to the manager of the certification
office, send it to ATTN: Program Manager, Continuing Operational
Safety, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; telephone 516-228-7300. Before using any
approved AMOC, notify your appropriate principal inspector, or
lacking a principal inspector, the manager of the responsible Flight
Standards Office.
(2) Contacting the Manufacturer: For any requirement in this AD
to obtain instructions from a manufacturer, the instructions must be
accomplished using a method approved by the Manager, New York ACO
Branch, FAA; or Transport Canada Civil Aviation (TCCA); 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.
(q) Related Information
(1) Refer to Mandatory Continuing Airworthiness Information
(MCAI) TCCA AD CF-2017-04R3, issued April 1, 2020 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-2022-0672.
(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#b38a9ed2c5c09eddcad2d0dc9ed0dcc0f3d5d2d29dd4dcc5"><span class="__cf_email__" data-cfemail="063f2b6770752b687f6765692b6569754660676728616970">[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#d5a1bdb195b1b0bdb4a3bcb9b9b4bbb1fbb6bab8"><span class="__cf_email__" data-cfemail="abdfc3cfebcfcec3caddc2c7c7cac5cf85c8c4c6">[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 June 2, 2022.
Gaetano A. Sciortino,
Deputy Director for Strategic Initiatives, Compliance & Airworthiness
Division, Aircraft Certification Service.
[FR Doc. 2022-12265 Filed 6-8-22; 8:45 am]
BILLING CODE 4910-13-P
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</html>Indexed from Federal Register on June 9, 2022.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.