[Federal Register Volume 85, Number 61 (Monday, March 30, 2020)]
[Rules and Regulations]
[Pages 17473-17478]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2020-06505]



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 Rules and Regulations
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  Federal Register / Vol. 85, No. 61 / Monday, March 30, 2020 / Rules 
and Regulations  

[[Page 17473]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2019-0726; Product Identifier 2019-NM-102-AD; Amendment 
39-19857; AD 2020-04-20]
RIN 2120-AA64


Airworthiness Directives; De Havilland Aircraft of Canada Limited 
(Type Certificate Previously Held by Bombardier, Inc.) Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for 
certain De Havilland Aircraft of Canada Limited Model DHC-8-400 series 
airplanes. 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. This AD 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. This AD also requires revising the existing 
maintenance or inspection program, as applicable, to incorporate new or 
more restrictive airworthiness limitations. For certain airplanes, this 
AD allows a modification that would terminate the repetitive 
inspections. The FAA is issuing this AD to address the unsafe condition 
on these products.

DATES: This AD is effective May 4, 2020.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of May 4, 2020.

ADDRESSES: For service information identified in this final rule, 
contact De Havilland Aircraft of Canada Limited, Q-Series Technical 
Help Desk, 123 Garratt Boulevard, Toronto, Ontario M3K 1Y5, Canada; 
telephone 416-375-4000; fax 416-375-4539; email thd@dehavilland.com; 
internet https://dehavilland.com. You may view this service information 
at the FAA, Transport Standards Branch, 2200 South 216th St., Des 
Moines, WA. For information on the availability of this material at the 
FAA, call 206-231-3195. It is also available on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2019-
0726.

Examining the AD Docket

    You may examine the AD docket on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2019-
0726; 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, the regulatory evaluation, 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; fax 516-
794-5531; email 9-avs-nyaco-cos@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued Canadian AD CF-2017-04R2, dated 
September 25, 2018 (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 https://www.regulations.gov by searching for and 
locating Docket No. FAA-2019-0726.
    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 October 30, 2019 (84 FR 58066). 
The NPRM 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. The NPRM proposed to require 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. The NPRM also proposed to require 
revising the existing maintenance or inspection program, as applicable, 
to incorporate new or more restrictive airworthiness limitations. For 
certain airplanes, the NPRM proposed to allow a modification that would 
terminate the repetitive inspections. The FAA is issuing 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.

Comments

    The FAA gave the public the opportunity to participate in 
developing this final rule. The following presents the comment received 
on the NPRM and the FAA's response to the comment.

Request To Refer to Different Temporary Revisions (TRs)

    Horizon Air requested that paragraph (k) of the proposed AD be 
revised to refer to TR ALI-0192 and TR ALI-0193. The commenter 
suggested that the proposed AD contains typographical errors in 
referring to TR ALI-00AS and TR ALI-00AT.
    The FAA agrees to clarify. Paragraph (k) of the proposed AD 
requires incorporating ``the information specified in Q400 Dash 8 
(Bombardier) Temporary Revision ALI-00AS, dated April 24, 2018; and 
Q400 Dash 8 (Bombardier) Temporary Revision ALI-00AT, dated April 24, 
2018.'' TCCA notified the FAA that TR ALI-00AS and TR ALI-00AT are 
temporary

[[Page 17474]]

placeholder identifiers for TR ALI-0192 and TR ALI-0193. These 
temporary placeholder identifiers are used until the finalized TRs are 
provided new numerical identifiers. The FAA has confirmed that the 
information specified in these TRs is the same as the information 
specified in the TRs mentioned by the commenter. For these reasons, 
this AD has been revised to specify TR ALI-0192 and TR ALI-0193.

Explanation of Change to Introductory Text to Paragraph (h) of This AD

    We have revised the introductory text to paragraph (h) of this AD 
to clarify that the actions apply to the same airplanes as those 
identified in the introductory text to paragraph (g) of this AD.

Conclusion

    The FAA reviewed the relevant data, considered the comment 
received, and determined that air safety and the public interest 
require adopting this final rule with the changes described previously 
and minor editorial changes. The FAA has determined that these minor 
changes:
     Are consistent with the intent that was proposed in the 
NPRM for addressing the unsafe condition; and
     Do not add any additional burden upon the public than was 
already proposed in the NPRM.
    The FAA also determined that these changes will not increase the 
economic burden on any operator or increase the scope of this final 
rule.

Related Service Information Under 1 CFR Part 51

    Bombardier has issued Service Bulletin 84-28-20, Revision D, dated 
November 23, 2018. This service information describes procedures for 
repetitive detailed inspections of the clamshell coupling bonding 
wires, fuel couplings, and associated sleeves for discrepancies (wear 
and damage, including discoloration, worn coating, scuffing and 
grooves) that meet specified criteria, and replacement. This service 
information also describes procedures for repetitive detailed 
inspections for damage and wear of the fuel tube end ferrules, fuel 
component end ferrules, and ferrule O-ring flanges, and rework of 
parts.
    Bombardier has also issued Service Bulletin 84-28-21, Revision C, 
dated July 13, 2018. This service information describes procedures for 
a detailed inspection for damage and wear of the fuel tube end 
ferrules, fuel component end ferrules, and ferrule O-ring flanges; 
rework (repair, replacement, or blending, as applicable) of parts; and 
a retrofit (structural rework) of the fuel couplings, isolators, and 
structural provisions.
    Bombardier has also issued Service Bulletin 84-28-26, Revision A, 
dated November 29, 2018. This service information describes procedures 
for electrical bonding checks of all threaded couplings on the inboard 
vent lines in the left and right wings.
    Bombardier has also issued 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. This service 
information describes airworthiness limitations for fuel tank systems. 
These documents are distinct since they describe different 
airworthiness limitations.
    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 *
----------------------------------------------------------------------------------------------------------------
                                                                                    Cost per       Cost on U.S.
                          Labor cost                              Parts cost        product         operators
----------------------------------------------------------------------------------------------------------------
268 work-hours x $85 per hour = $22,780......................              $0          $22,780       $1,184,560
----------------------------------------------------------------------------------------------------------------
* 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 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).

                                      Estimated Costs for Optional Actions
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                                  Labor cost                                       Parts cost        product
----------------------------------------------------------------------------------------------------------------
525 work-hours x $85 per hour = $44,625.......................................         $20,906          $65,531
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any necessary on-
condition actions that would be required based on the results of any 
required or optional actions. The FAA has no way of determining the 
number of aircraft that might need these on-condition actions:

                                     Estimated Costs of On-Condition Actions
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                                  Labor cost                                       Parts cost        product
----------------------------------------------------------------------------------------------------------------
174 work-hours x $85 per hour = $14,790.......................................         $16,767          $31,557
----------------------------------------------------------------------------------------------------------------


[[Page 17475]]

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. Subtitle VII: Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    The FAA is issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701: ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    This AD will not have federalism implications under Executive Order 
13132. This AD will not have a substantial direct effect on the States, 
on the relationship between the national government and the States, or 
on the distribution of power and responsibilities among the various 
levels of government.
    For the reasons discussed above, I certify that this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Will not affect intrastate aviation in Alaska, and
    (3) Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of 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 (AD):

2020-04-20 De Havilland Aircraft of Canada Limited (Type Certificate 
previously held by Bombardier, Inc.): Amendment 39-19857; Docket No. 
FAA-2019-0726; Product Identifier 2019-NM-102-AD.

(a) Effective Date

    This AD is effective May 4, 2020.

(b) Affected ADs

    None.

(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, 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. 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) Initial Inspection Compliance Times

    For airplanes having serial numbers 4001 and 4003 through 4575 
inclusive that, as of the effective date of this AD, 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.
    (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 the effective date of this AD.
    (2) For airplanes with an original airworthiness certificate or 
original export certificate of airworthiness issued on or after the 
effective date of this AD: 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.

(h) Repetitive Inspections and Corrective Actions

    For airplanes having serial numbers 4001 and 4003 through 4575 
inclusive that, as of the effective date of this AD, 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.
    (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 Service 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) Optional Terminating Action for Repetitive Inspections

    For airplanes having serial numbers 4001 and 4003 through 4575 
inclusive: Doing a detailed inspection of the fuel tube end 
ferrules, fuel component end ferrules, and ferrule O-ring flanges 
for damage and wear, and reworking (repair, replace, or blend, as 
applicable) the parts; and doing 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, terminates the inspections specified in 
paragraphs (h)(1) and (2) of this AD.

(j) Electrical Bonding Checks/Detailed Inspection

    For airplanes having serial numbers 4001, 4003 through 4489 
inclusive, and 4491 through 4575 inclusive that, as of the effective 
date of this AD, 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 the effective date of this AD, 
whichever occurs first, do the actions specified in paragraph (j)(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

[[Page 17476]]

Instructions of Bombardier Service Bulletin 84-28-21, Revision C, 
dated July 13, 2018.

(k) Maintenance or Inspection Program Revision

    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 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 (l) 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 the effective date of 
this AD, whichever occurs later.

(l) Initial Compliance Time for Task 284000-419

    The initial compliance time for task 284000-419 is at the time 
specified in paragraph (l)(1) or (2) of this AD, as applicable, or 
within 30 days after the effective date of this AD, 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.

(m) 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 (k) 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.

(n) No Reporting Requirement

    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.

(o) Credit for Previous Actions

    (1) This paragraph provides credit for the actions required by 
paragraphs (h)(1) and (2) of this AD, if those actions were 
performed before the effective date of this AD using the service 
information specified in paragraph (o)(1)(i), (ii), or (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 
the effective date of this AD using Bombardier Service Bulletin 84-
28-20, dated September 30, 2016.
    (3) This paragraph provides credit for the actions specified in 
paragraph (i) of this AD if those actions were performed before the 
effective date of this AD using the service information specified in 
paragraph (o)(3)(i), (ii), or (iii) 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.
    (iii) Bombardier Service Bulletin 84-28-21, Revision B, dated 
June 8, 2018.
    (4) This paragraph provides credit for the actions required by 
paragraph (j)(1) of this AD if those actions were performed before 
the effective date of this AD using Bombardier Service Bulletin 84-
28-26, dated August 14, 2018.
    (5) This paragraph provides credit for the actions required by 
paragraph (j)(2) of this AD if those actions were performed before 
the effective date of this AD 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 (j) of this AD if those actions were performed prior to 
the effective date of this AD using the service information 
specified in paragraph (o)(6)(i) or (ii) of this AD.
    (i) Bombardier Modification Summary Package (ModSum) 
IS4Q2800032, dated February 1, 2018.
    (ii) Any airworthiness limitation change request (ACR) specified 
in figure 1 to paragraph (o)(6)(ii) of this AD.
BILLING CODE 4910-13-P

[[Page 17477]]

[GRAPHIC] [TIFF OMITTED] TR30MR20.000

BILLING CODE 4910-13-C

(p) 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 local Flight Standards District 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; fax 516-794-5531. Before 
using any approved AMOC, notify your appropriate principal 
inspector, or lacking a principal inspector, the manager of the 
local flight standards district office/certificate holding district 
office.
    (2) Contacting the Manufacturer: For any requirement in this AD 
to obtain instructions from a manufacturer, the instructions must be 
accomplished using a method approved by the Manager, New York ACO 
Branch, FAA; or Transport Canada Civil Aviation (TCCA); or De 
Havilland Aircraft of Canada Limited's TCCA Design Approval 
Organization (DAO). If approved by the DAO, the approval must 
include the DAO-authorized signature.

(q) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) Canadian Airworthiness Directive CF-2017-04R2, dated 
September 25, 2018, for related information. This MCAI may be found 
in the AD docket on the internet at https://www.regulations.gov by 
searching for and locating Docket No. FAA-2019-0726.
    (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; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.
    (3) Service information identified in this AD that is not 
incorporated by reference is available at the addresses specified in 
paragraphs (r)(3) and (4) of this AD.

(r) 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 Service Bulletin 84-28-20, Revision D, dated 
November 23, 2018.
    (ii) Bombardier Service Bulletin 84-28-21, Revision C, dated 
July 13, 2018.
    (iii) Bombardier Service Bulletin 84-28-26, Revision A, dated 
November 29, 2018.
    (iv) Bombardier Q400 Dash 8 (Bombardier) Temporary Revision ALI-
0192, dated April 24, 2018.
    (v) Q400 Dash 8 (Bombardier) Temporary Revision ALI-0193, dated 
April 24, 2018.
    (3) For service information identified in this AD, contact De 
Havilland Aircraft of Canada Limited, Q-Series Technical Help Desk, 
123 Garratt Boulevard, Toronto, Ontario M3K 1Y5, Canada; telephone 
416-375-4000; fax 416-375-4539; email thd@dehavilland.com; internet 
https://dehavilland.com.
    (4) You may view this service information at the FAA, Transport 
Standards 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 fedreg.legal@nara.gov, or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html.


[[Page 17478]]


    Issued on March 1, 2020.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification 
Service.
[FR Doc. 2020-06505 Filed 3-27-20; 8:45 am]
 BILLING CODE 4910-13-P


