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VIKING AIR LIMITED (TYPE CERTIFICATE PREVIOUSLY HELD
BY BOMBARDIER INC. AND DE HAVILLAND, INC.):
Amendment 39-22002; Docket No. FAA-2022-0007; Project Identifier 2018-CE-048-AD.
(a) EFFECTIVE DATE This airworthiness directive (AD) is effective May 13, 2022. (b) AFFECTED ADS None. (c) APPLICABILITY This AD applies to Viking Air Limited (type certificate previously held by Bombardier Inc. and de Havilland, Inc.) Model DHC-6-400 air- planes, serial numbers 845 through 957, certificated in any category. (d) SUBJECT Joint Aircraft System Component (JASC) Code 2800, Aircraft Fuel System (e) REASON This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as corrosion of fuel system components located in the fuel gallery due to inadequate corrosion protection. The FAA is issuing this AD to prevent corrosion-related damage to fuel system components, which could lead to fuel leaks, electrical arcing, loss of fuel boost pump function, and erroneous fuel quantity readings. This unsafe condition, if not corrected, could result in fuel starvation with loss of engine power and increased risk of an in-flight fire with consequent loss of airplane control. (f) COMPLIANCE Comply with this AD within the compliance times specified, unless al- ready done. (g) REQUIRED ACTIONS FOR AIRPLANES OPERATING ON FLOATS ON THE EFFECTIVE DATE OF THIS AD (1) Within 50 hours time-in-service (TIS) after the effective date of this AD or within 3 months after the effective date of this AD, whichever occurs first, and thereafter at intervals not to exceed 125 hours TIS, do the following actions: (i) Remove all fuel gallery covers and rinse the fuel gallery with water. (ii) Inspect the fuel gallery for corrosion and if there is any corrosion, take all necessary corrective actions before further flight by following Item D.15(2) of Special Inspection 3 in Temporary Revision No. 241, dated July 27, 2021, to the Viking DHC-6 Inspection Require- ments Manual, PSM 1-6-7. (2) Within 12 months after the effective date of this AD, install the mod- ifications applicable to your airplane serial number by following the Accomplishment Instructions, sections A. through E., in Viking DHC-6 Twin Otter Service Bulletin No. V6/0044, Revision B, dated September 13, 2021 (Viking SB V6/0044, Revision B). (h) REQUIRED ACTIONS FOR AIRPLANES MODIFIED TO OPERATE ON FLOATS AFTER THE EFFECTIVE DATE OF THIS AD Within 12 months after the airplane is modified to operate on floats, regardless of whether the landing gear is later modified back to non- float landing gear, install the modifications applicable to your air- plane serial number by following the Accomplishment Instructions, sec- tions A. through E., in Viking SB V6/0044, Revision B. (i) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS) (1) 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 the attention of the person identi- fied in paragraph (j)(1) of this AD. (2) Before using any approved AMOC, notify your appropriate principal in- spector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. (j) RELATED INFORMATION (1) For more information about this AD, contact Joseph Catanzaro, Aviation Safety Engineer, New York ACO Branch, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone (516) 228-7366; email joseph.catanzaro@ faa.gov. (2) Refer to Transport Canada AD CF-2018-07, dated February 23, 2018, for more information. You may examine the Transport Canada AD in the AD docket at https://www.regulations.gov by searching for and locating Docket No. FAA-2022-0007. (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 the AD specifies otherwise. (i) Viking DHC-6 Twin Otter Service Bulletin No. V6/0044 Revision B, dated September 13, 2021. (ii) Temporary Revision No. 241, dated July 27, 2021, to the Viking DHC-6 Inspection Requirements Manual, PSM 1-6-7. (3) For service information identified in this AD, contact Viking Air Limited Technical Support, 1959 de Havilland Way, Sidney, British Columbia, Canada, V8L 5V5; phone: (North America) (800) 663-8444; fax: (250) 656-0673; email firstname.lastname@example.org; website: https: //www.vikingair.com/support/servicebulletins. (4) You may view this service information at the FAA, Airworthiness Prod- ucts Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106. For information on the availability of this material at the FAA call (817) 222-5110. (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. email@example.com, or go to: https://www.archives.gov/federal- register/cfr/ibr-locations.html. Issued on March 25, 2022. Lance T. Gant, Director, Compliance & Airworthi- ness Division, Aircraft Certification Service. FOR FURTHER INFORMATION CONTACT: Joseph Catanzaro, Aviation Safety Engi- neer, New York ACO Branch, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (516) 228-7366; email: firstname.lastname@example.org.
DEPARTMENT OF TRANSPORTATION