Airworthiness Directive · Amendment 39-19197 · Flight controls
Viking Air Limited Airplanes
This AD applies to Viking Air Limited Models DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300, and DHC-6-400 airplanes, all serial numbers, certificated in any category.
We are adopting a new airworthiness directive (AD) for Viking Air Limited Models DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300, and DHC-6- 400 airplanes. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and address an unsafe condition on an aviation product. The MCAI describes the unsafe condition as aileron cable wear; fouling at the wing root rib, fuselage skin, and wing root rib fairlead; and/or fraying of the cable from the root rib fairlead. We are issuing this AD to require actions to address the unsafe condition on these products.
Unless already done, do the following actions in paragraphs (f)(1) through (5) of this AD:
(1) Within the next 50 hours time-in-service (TIS) after March 27, 2018 (the effective date of this AD) or before the aileron cables have accumulated 300 hours TIS, whichever occurs later, inspect the aileron cables following the Accomplishment Instructions in Viking Air Limited Service Bulletin V6/0022, Revision B, dated June 13, 2014 (SB V6/0022, Revision B). Inspect repetitively thereafter at intervals not to exceed 500 hours TIS, but not to exceed five inspections (the initial and four repetitives).
(2) If any discrepancies are found during any of the inspections required in paragraph (f)(1) of this AD, before further flight, replace the aileron cable(s) following the Accomplishment Instructions in SB V6/0022, Revision B.
(3) Upon completion of the initial and four repetitive inspections detailed in paragraph (f)(1) of this AD, resume the inspections specified in the maintenance program.
(4) Within 30 days after completion of each inspection detailed in paragraph (f)(1) of this AD, report the results of each inspection to Viking Air Limited in accordance with the reporting instructions in SB V6/0022, Revision B.
(5) Installation of new aileron cables or re-installation of existing cables that have been removed for any reason re-starts the inspections required in paragraph (f)(1) of this AD.
