AD 80-12-01

80-12-01 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-3784. Applies to all Model L-188A and L-188C airplanes incorporating Supplemental Type Certificate SA1754WE or SA1831WE or SA2536WE (cargo door modification), certificated in all categories.

Compliance required as indicated, unless already accomplished.

To prevent rapid decompression, door warning failure or loss of cargo door, accomplish the following:

(a) Within 15 hours' time in service from the effective date of this AD except for those persons to whom it was made effective earlier by telegraphic AD T80WE-11 dated February 22, 1980, install a placard in plain view of the flight crew reading: "Pressurized Flight Prohibited", or:

(b) Inspect each cargo door and door sill by visual, magnetic particle, and dye penetrant methods per the instructions specified in paragraph B of Lockheed Alert Bulletin 88/LAS-1A, dated February 14, 1980, and per paragraph B of Lockheed Alert Bulletin 88/LAS- 1B, dated February 21,1980. Repair as required.

(c) The placard prohibiting pressurized flight may be removed after the accomplishment of paragraph (b) of this AD.

(d) For aircraft operated in the pressurized mode, prior to 1,000 hours' additional time in service since the last such inspection required by paragraph (b) of this AD, install cargo door structural reinforcements in accordance with Lockheed Aircraft Services Drawing 4036900 (No change), re-rig the cargo door per Lockheed Aircraft Services Drawing 4036982, Revision B, (after installation of reinforcements per Drawing 4036900), and inspect per paragraph C of Lockheed Alert Bulletin 88/LA5-1C dated March 24, 1980 within 5,000 hours' additional time in service since door modification and thereafter at intervals not to exceed 5,000 hours' time in service since the last such inspection.

(e) For aircraft operated either pressurized or unpressurized, prior to the accumulation of 1,000 hours' additional time in service from the effectivedate of this AD, rewire the cargo door warning light circuitry in accordance with Lockheed Aircraft Services Drawing 4036666, Revision D.

(f) For aircraft operated in the unpressurized mode, prior to the accumulation of 5,000 hours' additional time in service from the effective date of this AD, install cargo door structural reinforcements in accordance with Lockheed Aircraft Services Drawing 4036900 (No change), re-rig the cargo door per Lockheed Aircraft Services Drawing 4036982, Revision B, (after installation of reinforcements per Drawing 4036900), and inspect per paragraph C of Lockheed Alert Bulletin 88/LA5-1C dated March 24, 1980, within 5,000 hours' additional time in service since door modification and thereafter at intervals not to exceed 5,000 hours' time in service since the last such inspection.

(g) Alternative inspections, modifications or other actions which provide an equivalent level of safety may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region.

This amendment supersedes Telegraphic AD T80WE-11 dated February 22, 1980.

This amendment becomes effective June 9, 1980.