AD 75-08-14

75-08-14 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-2166 as amended by Amendment 39-2201 is further amended by Amendment 39-2627. Applies to Lockheed- California Company Model L-1011-385-1 series airplanes certificated in all categories.

To prevent possible failures of the C-1, C-2, and C-3 cargo door hooks due to cracks, accomplish the following:

(a) Within 275 additional flight hours after the effective date of this AD, unless already accomplished, perform the following per Lockheed Alert Service Bulletin 093-52-A079, Revision 1, dated March 26, 1975 or later FAA-approved revision.

(1) An inspection of the C-1, C-2 and C-3 cargo door hooks for identification configuration and affixing of appropriate part numbers;

(2) A dye penetrant inspection of all hooks for cracks;

(3) Replace all cracked hooks prior to further flight.

(4) Scrap hooks identified as P/N's 1517205-103/-105.

(5) Check rigging of hooks and doors for usage, and rerigg, as required.(b) Perform a dye penetrant inspection for cracks at intervals not to exceed 1500 hours time in service, of the C-1 and C-2 cargo door hooks identified as P/N's 1517205-107/-109 (per the inspection of (a)(1), above). Replace all cracked hooks prior to further flight.

(c) Within 3000 flight hours after the initial inspections performed per (a)(1) and (2), above, replace all hooks identified as P/N's 1517205-107/-109 with hooks identified as P/N's 1517205-111/-113 on the C-1 and C-2 cargo doors.

(d) The repetitive inspections required by paragraph (b) of this AD may be discontinued after accomplishment of modifications and checks in accordance with FAA-approved Lockheed-California Company Service Bulletin 093-52-087, dated March 11, 1976, or later FAA- approved revisions or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region. (Reference: Paragraph (f), AD 76-09-03).

(e) Equivalent inspections and replacements may be approved by the Chief, Aircraft Engineering Division, FAA Western Region.

(f) Airplanes may be flown to a base for the accomplishment of the inspections and replacements required by this AD, per FAR's 21.197 and 21.199.

Amendment 39-2166 became effective April 16, 1975.

Amendment 39-2201 became effective May 19, 1975.

This amendment 39-2627 becomes effective June 7, 1976.