81-08-03 GOVERNMENT AIRCRAFT FACTORIES (GAF): Amendment 39-4084. Applies to Nomad Model N22B (Serial Nos. N22B-5 and up) and Model N24A (Serial Nos. N24A-42 and up), airplanes certificated in all categories.
Compliance required as indicated, unless already accomplished.
To reduce the rate of wear experienced in the horizontal stabilizer trim tab control linkages and prevent instability due to excessive free play, accomplish the following:
(a) Within the next 50 hours time in service after the effective date of this AD, unless already accomplished, modify the horizontal stabilizer structure to accept the balanced trim tabs in accordance with Part A, "ACCOMPLISHMENT INSTRUCTIONS," of GAF Nomad Service Bulletin NMD-55-12, dated August 29, 1980, (hereinafter referred to as the Service Bulletin), or an FAA-approved equivalent. The trim tabs previously modified in accordance with Service Bulletin NMD-55-8 may be reinstalled until paragraph (b) is accomplished.
(b) Within the next 100 hours time in service after the effective date of this AD, unless already accomplished, install the balanced trim tabs in accordance with Part B of the Service Bulletin, or an FAA-approved equivalent.
(c) If an equivalent means of compliance is used in complying with paragraphs (a) and (b) of this AD, that equivalent means must be approved by the Chief, Engineering and Manufacturing District Office, FAA, Pacific-Asia Region, Honolulu, Hawaii.
This amendment becomes effective April 23, 1981.