81-22-03 DEHAVILLAND: Amendment 39-4245. Applies to all DHC-6 series aircraft certificated in all categories To prevent failure of the elevator torque tube hinge arm attachment bolt, P/N AN175-27A, accomplish the following:
Within the next 200 hours in service after the effective date of this airworthiness directive, accomplish the following inspection on all aircraft with 5000 hours or five years in service, whichever occurs first, unless already accomplished:
(a) Inspect elevator torque tube hinge arm attachment bolt, P/N AN175-27A, for cracks in accordance with DeHavilland Service Bulletin (S/B) No. 6/406 Accomplishment Instruction No. 5 or approved equivalent.
(b) If cracking is evident, replace damaged bolt with a new P/N AN175-27 in accordance with S/B No. 6/406 or approved equivalent and report to the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, JFK International Airport, Jamaica, New York 11430, Telephone (212) 995-2842. (Reporting approved by the Office of Management and Budget under OMB NO CA-R0174.)
(c) Alternative inspections or parts may be used when approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
(d) Compliance times may be increased by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, upon receipt of substantiating data submitted through an FAA maintenance inspector.
This amendment is effective November 2, 1981.