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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 39-21566; Docket No. FAA-2020-0975;
Project Identifier 2020-NM-061-AD.
(a) EFFECTIVE DATE This airworthiness directive (AD) is effective July 9, 2021. (b) AFFECTED AIRWORTHINESS DIRECTIVES (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, having serial num- bers 4001, and 4003 through 4534 inclusive. (d) SUBJECT Air Transport Association (ATA) of America Code 32, Landing Gear. (e) REASON This AD was prompted by a report of main landing gear (MLG) retractions after striking an obstacle or severe wheel imbalance after a tire failure. The FAA is issuing this AD to address loss of MLG downlock signal caused by the vibrations from those events, which leads to de-energizing the MLG solenoid sequence valve and subsequent removal of hydraulic pressure from the MLG downlock actuator. Loss of the hydraulic pressure in the downlock actuator, combined with the vibrations, can cause the stabilizer brace to unlock and the MLG to subsequently retract. (f) COMPLIANCE Comply with this AD within the compliance times specified, unless al- ready done. (g) DOWNLOCK SENSOR RIGGING AND REDUCED LOCK LINK OVER-CENTER Within 9 months after the effective date of this AD: Verify both the height of the lock link over-center stop pin and the gap of the left -hand and right-hand MLG downlock proximity sensors, and perform corrective actions as required, in accordance with paragraphs 3.A. and 3.B. of the Accomplishment Instructions of Bombardier Service Bulletin 84-32-140, Revision B, dated January 30, 2018. Do all applicable corrective actions before further flight. (h) INSTALLATION OF PROXIMITY SENSOR ELECTRONIC UNIT (PSEU) PART NUMBER (P/N) 30145-0601 Within 18 months after the effective date of this AD, install PSEU P/N 30145-0601 in accordance with paragraphs 3.A. and 3.B. of the Accom- plishment Instructions of Bombardier Service Bulletin 84-32-143, Revi- sion B, dated November 16, 2016. (i) INSTALLATION OF PSEU P/N 30145-0602 Installing PSEU P/N 30145-0602 in accordance with paragraphs 3.A. and 3.B. of the Accomplishment Instructions of Bombardier Service Bulletin 84-32-149, dated November 16, 2016, also accomplishes the requirements of paragraphs (g) and (h) of this AD. (j) CREDIT FOR PREVIOUS ACTIONS (1) This paragraph provides credit for actions required by paragraph (g) of this AD, if those actions were performed before the effective date of this AD using the service information as specified in paragraphs (j)(1)(i) or (ii) of this AD. (i) Bombardier Service Bulletin 84-32-140, dated August 5, 2016. (ii) Bombardier Service Bulletin 84-32-140, Revision A, dated June 12, 2017. (2) This paragraph provides credit for actions required by paragraphs (g) and (h) of this AD, if PSEU P/N 30145-0601 was installed before the effective date of this AD using the service information as specified in paragraphs (j)(2)(i) or (ii) of this AD. (i) Bombardier Service Bulletin 84-32-143, dated June 30, 2016. (ii) Bombardier Service Bulletin 84-32-143, Revision A, dated August 5, 2016. (k) 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; 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 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 Limitedís TCCA Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature. (l) RELATED INFORMATION (1) Refer to Mandatory Continuing Airworthiness Information (MCAI) TCCA AD CF-2016-31R1, dated March 24, 2017, 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-2020-0975. (2) For more information about this AD, contact Darren Gassetto, Aerospace Engineer, Mechanical Systems and Administrative Services Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7323; fax 516-794-5531; email 9-avs-nyacocos@ faa.gov. (3) Service information identified in this AD that is not incorporated by reference is available at the addresses specified in paragraphs (m)(3) and (4) of this AD. (m) 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) Bombardier Service Bulletin 84-32-140, Revision B, dated January 30, 2018. (ii) Bombardier Service Bulletin 84-32-143, Revision B, dated November 16, 2016. (iii) Bombardier Service Bulletin 84-32-149, dated November 16, 2016. (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 fedreg .email@example.com, or go to: https://www.archives.gov/federal-register/ cfr/ibr-locations.html. Issued on May 27, 2021. Ross Landes, Deputy Director for Regulatory Opera- tions, Compliance & Airworthiness Division, Aircraft Certification Service FOR FURTHER INFORMATION CONTACT: Darren Gassetto, Aerospace Engineer, Mechanical Systems and Administrative Services Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516- 228-7323; fax 516-794-5531; email firstname.lastname@example.org.
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