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2020-09-12 |
DE HAVILLAND AIRCRAFT OF CANADA LIMITED (TYPE CERTIFICATE
PREVIOUSLY HELD BY BOMBARDIER, INC.): Amendment 39-19908; Docket No. FAA-2020-0101; Product Identifier 2019-NM-190-AD. |
(a) EFFECTIVE DATE This AD is effective June 24, 2020. (b) AFFECTED ADS None. (c) APPLICABILITY This AD applies to De Havilland Aircraft of Canada Limited Model DHC- 8-400, -401, and -402 series airplanes, certificated in any category, serial numbers 4001 and subsequent. (d) SUBJECT Air Transport Association (ATA) of America Code 55, Stabilizers. (e) REASON This AD was prompted by a report that certain elevator power control unit (PCU) arm fittings have nonconforming fillet radii. The FAA is issuing this AD to address elevator PCU assemblies with nonconforming fillet radii, which could lead to premature failure of the fitting and a jam in one elevator; if the fittings on both elevators fail, a complete loss of elevator control could occur. (f) COMPLIANCE Comply with this AD within the compliance times specified, unless al- ready done. (g) DEFINITION Affected elevator PCU assemblies are those having part number 85527021 -005 or 85527021-006, and having serial number MMC4255 through MMC4276 inclusive. (h) INSPECTIONS For airplanes having serial numbers 4001 through 4620 inclusive, with- in 8,000 flight cycles on the elevator PCU assembly after the effective date of this AD, or before the accumulation of 30,000 total flight cycles on the elevator PCU assembly, whichever occurs first: Do the actions specified in paragraphs (h)(1) and (2) of this AD. (1) Inspect to determine the part number and serial number of each eleva- tor PCU assembly installed on the airplane. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number and serial number of the elevator PCU assembly can be conclusively determined from that review. (2) If, during any inspection or records review required by paragraph (h) (1) of this AD, any affected elevator PCU assembly is found, do a detailed inspection of the elevator PCU arm fittings for undersized fillet radii and cracks of the fillet radii in accordance with Part A of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-55-10, Revision A, dated July 25, 2019. If no undersized fillet radii or cracks of the fillet radii are found, before further flight, re-identify the affected elevator PCU assembly in accordance with the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-55-10, Revision A, dated July 25, 2019. (i) CORRECTIVE ACTIONS If during any inspection of the elevator PCU arm fittings required by paragraph (h)(2) of this AD, any undersized fillet radii or cracks of the fillet radii are found, before further flight, replace the elevator PCU arm fittings and re-identify each affected elevator PCU assembly in accordance with Part B of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-55-10, Revision A, dated July 25, 2019. (j) PARTS INSTALLATION LIMITATION As of the effective date of this AD, no person may install an affected elevator PCU assembly on any airplane, unless it has been re -identified in accordance with the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 84-55-10, Revision A, dated July 25, 2019. (k) CREDIT FOR PREVIOUS ACTIONS This paragraph provides credit for actions required by paragraphs (h) and (i) of this AD, if those actions were performed before the effec- tive date of this AD using De Havilland Aircraft of Canada Limited Service Bulletin 84-55-10, dated May 29, 2019. (l) NO REPORTING REQUIREMENT Although De Havilland Aircraft of Canada Limited Service Bulletin 84-55-10, Revision A, dated July 25, 2019, specifies to submit certain information to the manufacturer, this AD does not include that requirement. (m) 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; phone: 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. (n) RELATED INFORMATION (1) Refer to Mandatory Continuing Airworthiness Information (MCAI) Canadian AD CF-2019-36, dated October 18, 2019, for related informa- tion. 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- 2020-0101. (2) For more information about this AD, contact Andrea Jimenez, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Ave., Suite 410, Westbury, NY 11590; phone: 516-228-7330; 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 (o)(3) and (4) of this AD. (o) 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 84-55-10, Revision A, dated July 25, 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; phone: 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, 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 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. Issued on May 6, 2020. Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service. FOR FURTHER INFORMATION CONTACT: Andrea Jimenez, Aerospace Engineer, Air- frame and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Ave- nue, Suite 410, Westbury, NY 11590; phone: 516-228-7330; fax: 516-794-5531 email: 9-avs-nyaco-cos@faa.gov.
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