AD 78-03-02

78-03-02 GRUMMAN AMERICAN AVIATION CORPORATION: Amendment 39- 3134. Applies to Grumman American Aviation Corporation Model G-1159 airplanes, all serial numbers certificated in all categories.

COMPLIANCE: Compliance is required as indicated.

To prevent possible main landing gear failures, accomplish the following:

(A) Inspect the main landing gear prior to the next flight after the effective date of this A.D. to determine if part number 1159SC-L202-11 or 1159SC-L202-13 side brace/actuating cylinders are installed.

(B) Within the next ten landing gear operating cycles after the effective date of this A.D., replace all P/N 1159SC-L202-13 actuators with modified units identified as 1159SC-L202- 13A in accordance with Grumman American Aviation Corporation Mandatory Customer Bulletin #261 dated January 27, 1978.

(C) Within the next 100 landing gear operating cycles after the effective date of this A.D., inspect all P/N 1159SC-L202-11 actuators in accordance with Grumman American Mandatory Customer Bulletin #261 dated January 27, 1978, and if found defective, replace with modified units identified as 1159SC-L202-11A or -13A.

(D) Remove from the aircraft any 1159SC-L202-11A or 1159SC-L202-13A actuator upon accumulating more than 500 actuator cycles and replace with an allowable actuator having less than 500 cycles.

(E) An alternate method of compliance with paragraphs (B), (C), or (D) of this A.D. may be used if approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Southern Region.

This amendment becomes effective February 3, 1978.