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ADs updated daily at www.Tdata.com
DE HAVILLAND AIRCRAFT OF CANADA LIMITED (TYPE CERTIFICATE
PREVIOUSLY HELD BY BOMBARDIER, INC.):
Amendment 39-21589; Docket No. FAA-2021-0183; Project Identifier MCAI-2020-01408-T.
(a) EFFECTIVE DATE This airworthiness directive (AD) is effective July 20, 2021. (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-8-400, -401, and -402 airplanes, certificated in any category, serial numbers 4081 through 4591 inclusive. (d) SUBJECT Air Transport Association (ATA) of America Code 54, Nacelles/pylons. (e) REASON This AD was prompted by a report that a number of nacelle A-frames were not manufactured in accordance with engineering drawings. The holes in the side brace sub-assemblies were not cold-worked as required. As a result the side brace fitting might not meet its fatigue life, and cracking of the A-frame bottom flange may result. The FAA is issuing this AD to address possible cracking of the A -frame. This condition, if not addressed, may lead to collapse of the main landing gear (MLG). (f) COMPLIANCE Comply with this AD within the compliance times specified, unless al- ready done. (g) REQUIRED ACTIONS (1) Within the compliance time specified in paragraph (g)(2) of this AD, do the applicable actions specified in paragraphs (g)(1)(i) and (ii) of this AD. (i) For airplanes having serial numbers 4081 through 4582 inclusive: Re- move the fasteners on the nacelle A-frame side brace sub-assemblies, do an eddy current inspection for cracking on airplanes having 30,000 total flight cycles or more, cold-work the holes, and install oversize fasteners, in accordance with Part A of paragraph 3.B. of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-54-32, dated October 10, 2019. If any cracking is found, before further flight, repair the cracking 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. (ii) For all airplanes: Re-identify the reworked side brace fitting and A- frame, in accordance with Part B of paragraph 3.B. of the Accomplish- ment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-54-32, dated October 10, 2019. (2) At the earlier of the times specified in paragraphs (g)(2)(i) and (ii) of this AD, do the applicable actions specified in paragraph (g)(1) of this AD. (i) Within 48 months or 8,000 flight hours after the effective date of this AD, whichever occurs first. (ii) At the later of the times specified in paragraphs (g)(2)(ii)(A) and (B) of this AD. (A) Before accumulating 40,000 total flight cycles. (B) Within 12 months or 1,290 flight cycles after the effective date of this AD, whichever occurs first. (h) 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 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; fax 516-794-5531. 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 TCCA; or De Havilland Aircraft of Canada Limited's TCCA DAO. If approved by the DAO, the approval must include the DAO -authorized signature. (i) RELATED INFORMATION (1) Refer to Mandatory Continuing Airworthiness Information (MCAI) TCCA AD CF-2020-39, dated October 14, 2020, 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-2021- 0183. (2) For more information about this AD, contact Antariksh Shetty, Aero- space Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; fax 516-794-5531; email email@example.com. (j) 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) De Havilland Aircraft of Canada Limited Service Bulletin 84-54-32, dated October 10, 2019. (ii) [Reserved] (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 firstname.lastname@example.org; internet https:// dehavilland.com. (4) You may view this service information at the FAA, Airworthiness Prod- ucts 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 refer- ence at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, email email@example.com, or go to: https://www.archives.gov/federal- register/cfr/ibr-locations.html. Issued on May 25, 2021. Lance T Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service. FOR FURTHER INFORMATION CONTACT: Antariksh Shetty, Aerospace Engineer, Air -frame and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Ave- nue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; fax 516-794- 5531; email firstname.lastname@example.org.
DEPARTMENT OF TRANSPORTATION
Authority for This Rulemaking