AD 75-18-03 ACTIVE

75-18-03 LOCKHEED: Amendment 39-2342 as amended by Amendment 39-2511 is further amended by Amendment 39-3157. Applies to all Model 382 series airplanes certificated in all categories.

Compliance required within the next 50 hours time in service after the effective date of this Airworthiness Directive unless already accomplished, on airplane serial numbers 3946 and 4101 through 4298, with 6,300 hours or more total time in service, and serial numbers 4299 through 4541 with 9,450 hours or more total time in service on the effective date of Amendment 39-3157 and at intervals not to exceed 3,400 hours time in service from the last inspection until 20,000 hours (without ECP 954) or 24,000 hours (with ECP 954) at which time the interval is not to exceed l,700 hours from the last inspection.

(A) To detect cracks in the outer wing lower forward spar caps at OWS 54 and 108, eddy current inspect in accordance with Hercules Airfreighter Inspection procedures SMP515-A Card No. SP-62, revised August 11, 1975.

(B) If a crack or cracks are found, contact the Chief, Engineering and Manufacturing Branch, FAA, Southern Region, Atlanta, Georgia 30320, telephone number 404-526-7428.

Before the accumulation of more than 30,000 flight hours, preventive modification shall be installed in accordance with Lockheed Service Bulletin 382-187, or later FAA-Approved revision, or in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region.

The inspections required by this AD may be discontinued for those airplanes modified in accordance with the above paragraph.

Amendment 39-2342 became effective August 27, 1975.

Amendment 39-2511 became effective February 13, 1976.

This Amendment 39-3157 becomes effective March 20, 1978.