77-13-18 BRITISH AIRCRAFT CORPORATION: Amendment 39-2940. Applies to BAC 1- 11, Model 401AK series airplanes, certificated in all categories, which have Dupont Vespel bushings installed in the nose gear fall cam mechanism.
Compliance is required as indicated.
To prevent failure of free fall capability of the nose landing gear system, accomplish the following:
(a) Within the next 160 hours time in service after the effective date of this AD, unless already accomplished within the previous 160 hours time in service, and thereafter at intervals not to exceed 160 hours time in service from the last inspection, inspect the nose landing gear free fall mechanism in accordance with the procedures described in item BB of the "Accomplishment Instructions," paragraph 2, steps 1 through 8, of British Aircraft Corporation Alert Service Bulletin 32-A-PM5335, dated May 31, 1975, or an FAA-approved equivalent.
(b) The inspections of the nose landing gear free fall mechanism required by paragraph (a) of this AD may be terminated upon the replacement of the Dupont Vespel bushings in the free fall cam mechanism with British Aircraft Corporation bushing P/N AB44-1875 or AB44- 1943 (2 per airplane) and bushing P/N AB44- 1879 or AB44-1945 (1 per airplane).
This amendment becomes effective July 27, 1977.