| preamble attached >>> |
ADs updated daily at www.Tdata.com
|
| 2023-16-05 |
DE HAVILLAND AIRCRAFT OF CANADA LIMITED (TYPE CERTIFICATE
PREVIOUSLY HELD BY BOMBARDIER, INC.): Amendment 39-22524; Docket No. FAA-2023-1047; Project Identifier MCAI-2022-01601-T. |
(a) EFFECTIVE DATE
This airworthiness directive (AD) is effective September 25, 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-8-401 and
-402 airplanes, certificated in any category, having serial numbers
4001 and 4003 through 4633 inclusive.
(d) SUBJECT
Air Transport Association (ATA) of America Code: 32, Landing Gear.
(e) UNSAFE CONDITION
This AD was prompted by reports of the main landing gear (MLG) aft
door not opening when using the alternate extension system. The FAA is
issuing this AD to address possible cam assembly, spring box assembly,
and alternate release cable assembly failures. The unsafe condition,
if not addressed, could result in asymmetric MLG configuration at
landing, and a runway excursion.
(f) COMPLIANCE
Comply with this AD within the compliance times specified, unless al-
ready done.
(g) ONE-TIME INSPECTION
Within 2,400 flight hours or 12 months, whichever occurs first, after
the effective date of this AD, do a one-time general visual inspection
for discrepancies on the left and right MLG spring box assemblies
(part number (P/N) 48504-1), in accordance with Section 3.B., Part A,
of the Accomplishment Instructions of De Havilland Aircraft of Canada
Limited Service Bulletin 84-32-159, dated June 28, 2019. If any
discrepancy is discovered in the spring box assembly, before further
flight, replace with a new spring box assembly, in accordance with
Section 3.B. Part B, of the Accomplishment Instructions of De
Havilland Aircraft of Canada Limited Service Bulletin 84-32-159, dated
June 28, 2019.
(h) REPETITIVE INSPECTIONS
(1) Within 2,400 flight hours or 12 months, whichever occurs first, after
the effective date of this AD, do a general visual inspection for
discrepancies of the cam assemblies (P/N 48510-5) on the left and
right MLG, in accordance with Section 3.B. Part A, of the
Accomplishment Instructions of De Havilland Aircraft of Canada Limited
Service Bulletin 84-32-159, dated June 28, 2019. Thereafter, repeat
the inspection at intervals not to exceed 2,400 flight hours or 12
months, whichever occurs first. If any discrepancy is discovered in
the cam assembly, before further flight, replace with a new cam
assembly, in accordance with Section 3.B. Part B, of the
Accomplishment Instructions of De Havilland Aircraft of Canada Limited
Service Bulletin 84-32-159, dated June 28, 2019.
(2) Within 2,400 flight hours or 12 months, whichever occurs first, after
the effective date of this AD, do a general visual inspection for
discrepancies of the alternate release cable assemblies (P/N 48503-3)
on the left and right MLG, in accordance with Section 3.B., Part A, of
the Accomplishment Instructions of De Havilland Aircraft of Canada
Limited Service Bulletin 84-32-159, dated June 28, 2019. Thereafter,
repeat the inspection at intervals not to exceed 2,400 flight hours or
12 months, whichever occurs first. If any discrepancy is found, before
further flight, replace the alternate release cable assembly with a
redesigned alternate release cable assembly P/N 48503-5, in accordance
with Section 3.B. of the Accomplishment Instructions of De Havilland
Aircraft of Canada Limited Service Bulletin 84-32-172, dated August
16, 2022, including Collins Aerospace Service Bulletin 48500-32-152,
dated July 18, 2022. Accomplishing the replacement required by
paragraph (i) of this AD terminates the inspections required by this
paragraph.
(i) REPLACEMENT
Within 5,500 flight hours or 30 months, whichever occurs first, after
the effective date of this AD, replace the left and right MLG
alternate release cable assemblies, P/N 48503-3, with the redesigned
alternate release cable assembly, P/N 48503-5, in accordance with
Section 3.B. of the Accomplishment Instructions of De Havilland
Aircraft of Canada Limited Service Bulletin 84-32-172, dated August
16, 2022, including Collins Aerospace Service Bulletin 48500-32-152,
dated July 18, 2022.
(j) MAINTENANCE TASK REQUIREMENT
As of the effective date of this AD, when installing an MLG alternate
extension system cam assembly and when installing an alternate release
cable assembly, the following aircraft maintenance manual (AMM) tasks
must be used, as applicable:
(1) For the alternate release cable assembly: AMM TASK 32-34-16-400-804,
"Installation of the Alternate Extension Cables-Center Fuselage to
Nacelle" as specified in De Havilland Aircraft of Canada Limited
Temporary Revision 32-603, dated December 1, 2022.
(2) For the MLG alternate extension system cam assembly: AMM TASK 32-34-26
-400-801, "Installation of the MLG Alternate - Extension Cam-Mechanism
Assembly" of Subject 32-34-26, "Cam Mechanism Assembly-MLG Alternative
Extension" in Chapter 32, "Landing Gear," of the De Havilland Aircraft
of Canada Limited Aircraft Maintenance Manual Revision 76, dated March
5, 2022.
(k) PARTS INSTALLATION PROHIBITION
As of the effective date of this AD, no person may install, on any air
-plane, an alternate release cable assembly P/N 48503-3.
(l) ADDITIONAL AD PROVISIONS
The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, International
Validation 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 International
Validation Branch, mail it to ATTN: Program Manager, Continuing
Operational Safety, at the address identified in paragraph (m)(2) of
this AD or email to: 9-avs-nyaco-cos@faa.gov. If mailing information,
also submit information by email. 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, International
Validation 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.
(m) ADDITIONAL INFORMATION
(1) Refer to Transport Canada AD CF-2022-69, dated December 16, 2022, for
related information. This Transport Canada AD may be found in the AD
docket at regulations.gov under Docket No. FAA-2023-1047.
(2) For more information about this AD contact Gabriel Kim, Aviation Safe-
ty Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7300; email 9-avs-nyaco-cos@faa.gov.
(n) 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) De Havilland Aircraft of Canada Limited Service Bulletin 84-32-159,
dated June 28, 2019.
(ii) De Havilland Aircraft of Canada Limited Service Bulletin 84-32-172,
dated August 16, 2022, including Collins Aerospace Service Bulletin
48500-32-152, dated July 18, 2022.
Note 1 to paragraph (n)(2)(ii): De Havilland issued De Havilland Service
Bulletin 84-32-172, dated August 16, 2022, with Collins Aerospace Service
Bulletin 48500-32-152, dated July 18, 2022, attached as one "merged" file
for the convenience of affected operators.
(iii) De Havilland Aircraft of Canada Limited Temporary Revision 32-603,
dated December 1, 2022.
(iv) AMM TASK 32-34-26-400-801, "Installation of the MLG Alternate-Exten-
sion Cam-Mechanism Assembly," of Subject 32-34-26, "Cam Mechanism
Assembly-MLG Alternative Extension" in Chapter 32, "Landing Gear," of
the De Havilland Aircraft of Canada Limited Aircraft Maintenance Man-
ual, Revision 76, dated March 5, 2022.
(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:
thd@dehavilland.com; website: dehavilland.com.
(4) You may view this service information at the FAA, Airworthiness Prod-
ucts Section, Operational Safety Branch, 2200 South 216th Street, 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 refer-
ence at the National Archives and Records Administration (NARA). For
information on the availability of this material at NARA, email fr.
inspection@nara.gov, or go to: www.archives.gov/federal-register/cfr/
ibr-locations.html.
Issued on August 7, 2023. Victor Wicklund, Deputy Director, Compliance &
Airworthiness Division, Aircraft Certification Service.
FOR FURTHER INFORMATION CONTACT: Gabriel Kim, Aviation Safety Engineer,
FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228
-7300; email 9-avs-nyaco-cos@faa.gov.
| PREAMBLE |
|
|
DEPARTMENT OF TRANSPORTATION
The FAA estimates the following costs
to do any necessary on-
The FAA has included all known costs
in its cost estimate. |