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DE HAVILLAND AIRCRAFT OF CANADA LIMITED (TYPE CERTIFICATE
PREVIOUSLY HELD BY BOMBARDIER, INC.):
Amendment 39-22370; Docket No. FAA-2022-1653; Project Identifier MCAI-2022-01193-T.
(a) EFFECTIVE DATE This airworthiness directive (AD) is effective April 18, 2023. (b) AFFECTED ADS None. (c) APPLICABILITY This AD applies to De Havilland Aircraft of Canada Limited (Type Cer- tificate previously held by Bombardier, Inc.) Model DHC-8-401 and -402 airplanes, certificated in any category, serial numbers 4001 and 4003 through 4633 inclusive. (d) SUBJECT Air Transport Association (ATA) of America Code: 27, Flight Controls. (e) UNSAFE CONDITION This AD was prompted by reports of flap power unit (FPU) pressure switch failures resulting in flap inoperative events. The FAA is issuing this AD to address FPU pressure switch failures. The unsafe condition, if not addressed, could result in abnormal flap landings and increased landing distances, which could require the use of emergency landing procedures and/or airfield diversions. (f) COMPLIANCE Comply with this AD within the compliance times specified, unless al- ready done. (g) REQUIREMENTS Within 8,000 flight hours or 48 months after the effective date of this AD, whichever occurs first: Do the actions specified in either paragraph (g)(1) or (2) of this AD. (1) Replace FPU part number (P/N) C148656-1 or C148656-2 with P/N C148656- 3 and do an operational test of the wing flaps in accordance with Sec- tion 3.B. paragraph (1) and Section 3.C. paragraph (2), of the Accom- plishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-27-75, dated June 23, 2022, including Collins Aerospace Service Bulletin 27-0029, dated June 13, 2022. (2) Replace FPU pressure switch P/N 150135-1 or 162660-1 with P/N 162660- 2, reidentify the FPU as P/N C148656-3, and do an operational test of the wing flaps in accordance with Section 3.B. paragraph (2) and Sec- tion 3.C. paragraph (2), of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-27-75, dated June 23, 2022, including Collins Aerospace Service Bulletin 27-0029, dated June 13, 2022. (h) PARTS INSTALLATION PROHIBITION As of the effective date of this AD, do not install a FPU having P/N C148656-1 or C148656-2 or a FPU pressure switch having P/N 150135-1 or 162660-1 on any airplane. (i) ADDITIONAL 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 Design Organization Approval (DOA). If approved by the DOA, the approval must include the DOA-authorized signature. (j) ADDITIONAL INFORMATION (1) Refer to Transport Canada AD CF-2022-52, dated September 1, 2022, for related information. This Transport Canada AD may be found in the AD docket at regulations.gov under Docket No. FAA-2022-1653. (2) For more information about this AD, contact Gabriel Kim, Aerospace Engineer, Mechanical Systems and Administrative Services Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone (516) 228-7300; email firstname.lastname@example.org. (k) 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 84-27-75, dated June 23, 2022, including Collins Aerospace Service Bulletin 27- 0029, dated June 13, 2022. Note 1 to paragraph (k)(2)(i): De Havilland issued De Havilland Service Bulletin 84-27-75, dated June 23, 2022, with Collins Aerospace Service Bulletin 27-0029, dated June 13, 2022, attached as one "merged" file for the convenience of affected operators. (ii) [Reserved] (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 email@example.com; website dehavilland.com. (4) You may view this material 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 material that is incorporated by reference 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 March 2, 2023. Christina Underwood, Acting Director, Compliance & Airworthiness Division, Aircraft Certification Service. FOR FURTHER INFORMATION CONTACT: Gabriel Kim, Aerospace Engineer, Mechani- cal Systems and Administrative Services Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone (516) 228- 7300; email firstname.lastname@example.org.
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