Document ID: FAA-2022-1151-0004
Agency: faa
Document Type: Rule
Title: Airworthiness Directives: De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
Posted Date: 2023-02-06T05:00Z

[Federal Register Volume 88, Number 24 (Monday, February 6, 2023)]
[Rules and Regulations]
[Pages 7568-7572]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-02370]

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

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-1151; Project Identifier MCAI-2020-01603-T; 
Amendment 39-22303; AD 2023-01-09]
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 a report that electrical bonding 
jumpers had been installed on fuel scavenge lines even after the 
removal was required by previous AD rulemaking and that electrical 
bonding jumpers may have been installed in production or in service at 
other locations. This AD requires an inspection for electrical bonding 
jumpers and brackets on the fuel scavenge and vent lines at specific 
wing locations, and if installed, removal or modification of those 
jumpers and brackets. This AD also requires a records check to 
determine if certain maintenance tasks were performed and removal, 
modification, or rework if those tasks were performed. This AD also 
prohibits the use of earlier versions of certain maintenance tasks. The 
FAA is issuing this AD to address the unsafe condition on these 
products.

DATES: This AD is effective March 13, 2023.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of March 13, 
2023.

ADDRESSES: 
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket

[[Page 7569]]

No. FAA-2022-1151; 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 mandatory continuing airworthiness 
information (MCAI), 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.
    Material Incorporated by Reference:
     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 North America (toll-free): 855-310-1013, Direct: 647-
277-5820; email dehavilland.com">[email protected]dehavilland.com; website dehavilland.com.
     You may view this service information at the FAA, 
Airworthiness Products Section, Operational Safety Branch, 2200 South 
216th St., Des Moines, WA. For information on the availability of this 
material at the FAA, call 206-231-3195. It is also available at 
regulations.gov under Docket No. FAA-2022-1151.

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

    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, -401, and -402 airplanes. 
The NPRM published in the Federal Register on September 9, 2022 (87 FR 
55322). The NPRM was prompted by AD CF-2020-01, dated January 14, 2020, 
issued by Transport Canada, which is the aviation authority for Canada 
(referred to after this as the MCAI). The MCAI states it was reported 
that electrical bonding jumpers had been installed on fuel scavenge 
lines even after the removal was required by Transport Canada AD CF-
2010-31, dated September 3, 2010 (which corresponds to FAA AD 2011-13-
06, Amendment 39-16729 (76 FR 37258, June 27, 2011) (AD 2011-13-06)). 
Subsequent investigation showed that electrical bonding jumpers may 
have been installed in production or in service at other locations on 
the fuel scavenge and vent lines. If installed, these electrical 
bonding jumpers could affect the integrity of the fuel scavenge and 
vent lines' electrical bonding paths, which may lead to lightning 
strike induced fuel tank ignition.
    In the NPRM, the FAA proposed to require an inspection for 
electrical bonding jumpers and brackets on the fuel scavenge and vent 
lines at specific wing locations, and if installed, removal or 
modification of those jumpers and brackets. The FAA also proposed to 
require a records check to determine if certain maintenance tasks were 
performed and removal, modification, or rework if those tasks were 
performed. The FAA also proposed to prohibit the use of earlier 
versions of certain maintenance tasks. The FAA is issuing this AD to 
address altered electrical bonding paths, which may lead to lightning 
strike-induced ignition of the fuel tank.
    You may examine the MCAI in the AD docket at regulations.gov under 
Docket No. FAA-2022-1151.

Discussion of Final Airworthiness Directive

Comments

    The FAA received a comment 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 to each comment.

Request To Remove Job Access and Close-up Requirements

    Horizon Air requested revising paragraphs (h)(1) and (2) of the 
proposed AD to remove the Job Set-up and Close-Out sections of the 
Accomplishment Instructions of Bombardier Service Bulletins 84-28-29 
and 84-28-30, both dated October 17, 2018, from the requirements of the 
proposed AD. Horizon Air asserted that incorporating the Job Set-up and 
Close Out sections of the Accomplishment Instructions do not address 
the unsafe condition and also restrict an operator's ability to perform 
other maintenance in conjunction with the incorporation of the service 
bulletins.
    In this case, the FAA agrees with the commenter's request to 
exclude the ``Job Set-up'' and ``Close Out'' sections of Bombardier 
Service Bulletin 84-28-29; and 84-28-30; both dated October 17, 2018. 
The FAA has revised paragraphs (h)(1) and (2) of this AD to require 
accomplishment of paragraph 3.B., ``Procedure,'' of the Accomplishment 
Instructions of Bombardier Service Bulletins 84-28-29; or 84-28-30; 
both dated October 17, 2018; as applicable.

Request To Correct Typographical Errors

    Horizon Air requested correction of some typographical errors it 
found in paragraphs (h)(1) and (2) of the proposed AD. Horizon Air 
noted that the dates provided for the referenced service bulletins was 
published in the NPRM as October 1 instead of October 17 in two places. 
Horizon Air also pointed out that in paragraph (h)(2) of the proposed 
AD, the first reference to a service bulletin seems to be in error and 
should be 84-28-30 instead of 84-28-29.
    The FAA acknowledges the typographical errors and agrees to the 
request. Paragraphs (h)(1) and (2) of this AD have been revised as 
requested.

Conclusion

    This product has been approved by the aviation authority of another 
country and is approved for operation in the United States. Pursuant to 
the FAA's bilateral agreement with this State of Design Authority, it 
has notified the FAA of the unsafe condition described in the MCAI 
referenced above. The FAA reviewed the relevant data, considered the 
comments received, and determined that air safety requires adopting 
this AD as proposed. Accordingly, the FAA is issuing this AD to address 
the unsafe condition on this product. Except for minor editorial 
changes, this AD is adopted as proposed in the NPRM. None of the 
changes will increase the economic burden on any operator.

Related Service Information Under 1 CFR Part 51

    De Havilland Aircraft of Canada Limited has issued Bombardier 
Service Bulletins 84-28-29; and 84-28-30; both dated October 17, 2018; 
which describe procedures for an inspection of certain wing stations in 
the left and right wings for the presence of brackets and electrical 
bonding jumpers on the fuel scavenge and vent lines, and if installed, 
removal or modification of those electrical bonding jumpers and 
brackets. These documents are distinct because they apply to different 
airplane configurations.
    De Havilland Aircraft of Canada Limited has also issued the 
following Bombardier service information, which describes fuel system 
limitations, critical design configuration control limitations 
(CDCCLs), or airworthiness limitations for fuel tank systems. These 
documents are distinct because they

[[Page 7570]]

apply to different airplane configurations.
     (Bombardier) Q400 Dash 8 Aircraft Maintenance Manual (AMM) 
Temporary Revision (TR) 28-170, dated November 2, 2018.
     (Bombardier) Q400 Dash 8 AMM TR 28-171, dated November 2, 
2018.
     (Bombardier) Q400 Dash 8 AMM TR 28-166, dated November 2, 
2018.
     (Bombardier) Q400 Dash 8 AMM TR 28-167, dated November 2, 
2018.
     (Bombardier) Q400 Dash 8 AMM TR 28-168, dated November 2, 
2018.
     (Bombardier) Q400 Dash 8 AMM TR 28-169 dated November 2, 
2018.
     (Bombardier) Q400 Dash 8 AMM TR 28-163, dated August 1, 
2018.
     (Bombardier) Q400 Dash 8 Maintenance Task Card Manual 
(MTCM) Maintenance Task Card 000-28-520-704 (Config A01), Detailed 
Inspection of the Teflon Sleeve on the Fuel Tank Vent Line (LH), 
Revision 43, Amendment 0001, dated August 1, 2018.
     (Bombardier) Q400 Dash 8 MTCM Maintenance Task Card 000-
28-620-704 (Config A01), Detailed Inspection of the Teflon Sleeve on 
the Fuel Tank Vent Line (RH), Revision 43, Amendment 0001, dated August 
1, 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.

Costs of Compliance

    The FAA estimates that this AD will affect 53 airplanes of U.S. 
registry. The FAA estimates the following costs to comply with this AD:

                                      Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
               Labor cost                   Parts cost         Cost per product         Cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
Up to 94 work-hours x $85 per hour = Up               $0  Up to $7,990..............  Up to $423,470.
 to $7,990.
----------------------------------------------------------------------------------------------------------------

                 Estimated Costs of On-Condition Actions
------------------------------------------------------------------------
          Labor cost             Parts cost         Cost per product
------------------------------------------------------------------------
Up to 40 work-hours x $85 per            $100  Up to $3,500.
 hour = Up to $3,400.
------------------------------------------------------------------------

    The FAA has received no definitive data on which to base the cost 
estimates for the on-condition rework 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.

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:

2023-01-09 De Havilland Aircraft of Canada Limited (Type Certificate 
Previously Held by Bombardier, Inc.): Amendment 39-22303; Docket No. 
FAA-2022-1151; Project Identifier MCAI-2020-01603-T.

(a) Effective Date

    This airworthiness directive (AD) is effective March 13, 2023.

(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, having serial 
numbers 4001, 4003, and subsequent.

(d) Subject

    Air Transport Association (ATA) of America Code 28, Fuel System.

(e) Unsafe Condition

    This AD was prompted by a report that electrical bonding jumpers 
had been installed on fuel scavenge lines even after the removal was 
required by previous AD rulemaking and electrical bonding jumpers 
may have been installed in production or in service at other 
locations. The FAA is issuing this AD to address altered electrical 
bonding paths, which may lead to lightning strike-induced ignition 
of the fuel tank.

(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 identified 
as any task identified in paragraph (j) of this AD and any procedure

[[Page 7571]]

or task that specifies fuel tank access using non-manufacturer-
approved procedures.

(h) Inspection and Modification

    (1) For airplanes having serial numbers 4001, and 4003 through 
4118 inclusive: Within 6,000 flight hours or 36 months after the 
effective date of this AD, whichever occurs first, inspect wing 
stations 79.7, 136.3, 173.2, and 
299.019 in the left and right wings for the presence of 
brackets and electrical bonding jumpers installed on the fuel 
scavenge and vent lines, in accordance with paragraph 3.B., 
``Procedure,'' of the Accomplishment Instructions of Bombardier 
Service Bulletin 84-28-29, dated October 17, 2018. If installed, 
remove or modify the electrical bonding jumpers and brackets as 
applicable, before further flight, in accordance with paragraph 
3.B., ``Procedure,'' of the Accomplishment Instructions of 
Bombardier Service Bulletin 84-28-29, dated October 17, 2018.
    (2) For airplanes having serial numbers 4119 through 4597 
inclusive: Within 6,000 flight hours or 36 months after the 
effective date of this AD, whichever occurs first, inspect wing 
stations 79.7, 136.3, and 173.2 
in the left and right wings for the presence of brackets and 
electrical bonding jumpers on the fuel scavenge and vent lines, in 
accordance with paragraph 3.B., ``Procedure,'' of the Accomplishment 
Instructions of Bombardier Service Bulletin 84-28-30, dated October 
17, 2018. If installed, remove or modify the electrical bonding 
jumpers and brackets as applicable, before further flight, in 
accordance with paragraph 3.B., ``Procedure,'' of the Accomplishment 
Instructions of Bombardier Service Bulletin 84-28-30, dated October 
17, 2018.

(i) Verification and Rework for the Existing Maintenance Program

    (1) For airplanes having serial numbers 4001, and 4003 through 
4597 inclusive, on which the actions required by paragraph (h)(1) or 
(2) of this AD have been done 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 during 
or after compliance with paragraph (h)(1) or (2) of this AD. If any 
of the prohibited tasks were accomplished during or after compliance 
with paragraph (h)(1) or (2) of this AD, or if it cannot be 
conclusively confirmed that they were not accomplished during or 
after compliance with paragraph (h)(1) or (2) of this AD: Within 
6,000 flight hours or 36 months after the effective date of this AD, 
whichever occurs first, do the actions required by paragraph (h)(1) 
or (2) of this AD, as applicable.
    (2) For airplanes having serial numbers 4598 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 6,000 flight hours or 36 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; or De Havilland Aircraft of Canada 
Limited's Transport Canada Design Approval Organization (DAO). If 
approved by the DAO, the approval must include the DAO-authorized 
signature.

(j) Maintenance Task Prohibitions

    For all airplanes: As of the effective date of this AD, comply 
with the prohibitions specified in paragraphs (j)(1) and (2) of this 
AD.
    (1) It is prohibited to use the Bombardier aircraft maintenance 
manual (AMM) tasks identified in paragraphs (j)(1)(i) through (vii) 
of this AD, which are specified in the Bombardier Q400, PSM 1-84-2, 
Revision 63, dated October 5, 2018, or earlier revisions of these 
tasks. Temporary Revisions (TRs) including these AMM tasks, dated 
November 2, 2018, or earlier, are also prohibited for use except as 
specified in paragraph (j)(1)(i) through (vii) of this AD.
    (i) Task 28-12-01-000-801, Removal of the Inboard Vent Line, 
with the exception of (Bombardier) Q400 Dash 8 AMM TR 28-170, dated 
November 2, 2018.
    (ii) Task 28-12-01-400-801, Installation of the Inboard Vent 
Line, with the exception of (Bombardier) Q400 Dash 8 AMM TR 28-171, 
dated November 2, 2018.
    (iii) Task 28-11-06-000-801, Removal of the Motive Flow Lines, 
with the exception of (Bombardier) Q400 Dash 8 AMM TR 28-166, dated 
November 2, 2018.
    (iv) Task 28-11-06-400-801, Installation of the Motive Flow 
Lines, with the exception of (Bombardier) Q400 Dash 8 AMM TR 28-167, 
dated November 2, 2018.
    (v) Task 28-11-16-000-801, Removal of the Scavenge Flow Lines, 
with the exception of (Bombardier) Q400 Dash 8 AMM TR 28-168, dated 
November 2, 2018.
    (vi) Task 28-11-16-400-801, Installation of the Scavenge Flow 
Lines, with the exception of (Bombardier) Q400 Dash 8 AMM TR 28-169, 
dated November 2, 2018.
    (vii) Task 28-10-00-280-806, Detailed Inspection of the Teflon 
Sleeve on the Fuel Tank Vent Line, LH and RH (FSL #284000-406), with 
the exception of (Bombardier) Q400 Dash 8 AMM TR 28-163, dated 
August 1, 2018.
    (2) It is prohibited to use the Bombardier Q400 Dash 8 
Maintenance Task Card Manual (MTCM) task cards identified in 
paragraphs (j)(2)(i) and (ii) of this AD that are specified in the 
Bombardier Q400 Dash 8 MTCM, PSM 1-84-7TC, Revision 43, dated May 5, 
2018, or earlier revisions or amendments of these task cards. MTCM 
task card revisions or amendments dated August 1, 2018, or earlier, 
are also prohibited for use, except as specified in paragraphs 
(j)(2)(i) and (ii) of this AD.
    (i) Bombardier Q400 Dash 8 MTCM Maintenance Task Card 000-28-
520-704 (Config A01), Detailed Inspection of the Teflon Sleeve on 
the Fuel Tank Vent Line (LH), with the exception of (Bombardier) 
Q400 Dash 8 MTCM Maintenance Task Card 000-28-520-704 (Config A01), 
Detailed Inspection of the Teflon Sleeve on the Fuel Tank Vent Line 
(LH), Revision 43, Amendment 0001, dated August 1, 2018.
    (ii) Bombardier Q400 Dash 8 MTCM Maintenance Task Card 000-28-
620-704 (Config A01), Detailed Inspection of the Teflon Sleeve on 
the Fuel Tank Vent Line (RH), with the exception of (Bombardier) 
Q400 Dash 8 MTCM Maintenance Task Card 000-28-620-704 (Config A01), 
Detailed Inspection of the Teflon Sleeve on the Fuel Tank Vent Line 
(RH), Revision 43, Amendment 0001, dated August 1, 2018.

(k) Other 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 Transport Canada; or De Havilland Aircraft of Canada 
Limited's Transport Canada DAO. If approved by the DAO, the approval 
must include the DAO-authorized signature.

(l) Additional Information

    (1) Refer to Transport Canada AD CF-2020-01, dated January 14, 
2020, for related information. This Transport Canada AD may be found 
in the AD docket at regulations.gov under Docket No. FAA-2022-1151.
    (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].

(m) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference 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) Q400 Dash 8 Aircraft Maintenance Manual (AMM) 
Temporary

[[Page 7572]]

Revision (TR) 28-170, dated November 2, 2018.
    (ii) (Bombardier) Q400 Dash 8 AMM TR 28-171, dated November 2, 
2018.
    (iii) (Bombardier) Q400 Dash 8 AMM TR 28-166, dated November 2, 
2018.
    (iv) (Bombardier) Q400 Dash 8 AMM TR 28-167, dated November 2, 
2018.
    (v) (Bombardier) Q400 Dash 8 AMM TR 28-168, dated November 2, 
2018.
    (vi) (Bombardier) Q400 Dash 8 AMM TR 28-169 dated November 2, 
2018.
    (vii) (Bombardier) Q400 Dash 8 AMM TR 28-163, dated August 1, 
2018.
    (viii) (Bombardier) Q400 Dash 8 Maintenance Task Card Manual 
(MTCM) Maintenance Task Card 000-28-520-704 (Config A01), Detailed 
Inspection of the Teflon Sleeve on the Fuel Tank Vent Line (LH), 
Revision 43, Amendment 0001, dated August 1, 2018.
    (ix) (Bombardier) Q400 Dash 8 MTCM Maintenance Task Card 000-28-
620-704 (Config A01), Detailed Inspection of the Teflon Sleeve on 
the Fuel Tank Vent Line (RH), Revision 43, Amendment 0001, dated 
August 1, 2018.
    (x) Bombardier Service Bulletin 84-28-29, dated October 17, 
2018.
    (xi) Bombardier Service Bulletin 84-28-30, dated October 17, 
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 North America (toll-free): 855-310-1013, Direct: 
647-277-5820; email dehavilland.com">[email protected]dehavilland.com; website 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 January 10, 2023.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2023-02370 Filed 2-3-23; 8:45 am]
BILLING CODE 4910-13-P