78-04-01 BEECH: Amendment 39-3139. Applies to the following models and serial number airplanes, equipped with manually operated wing flaps, certificated in all categories:
MODEL
SERIAL NUMBERS
23, A23, A23A, B23, and C23
M-1 through M-1979
A23-19, 19A and B19
MB-1 through MB-866
A23-24 and A24
MA-1 through MA-368
A24R, B24R AND C24R
MC-2 through MC-536
COMPLIANCE: Required a indicated unless already accomplished.
To prevent failure of the wing flap control weld assembly and resulting possible unwanted in-flight retraction of the wing flaps, within the next 50 hours time-in-service after the effective date of this AD, accomplish the following in accordance with Beechcraft Service Instructions No. 0940 or later approved revisions:
A) Remove flap control weld assembly and install Beech P/N 169-524024-85 flap control weld assembly.
B) Any equivalent means of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.
This amendment becomes effective on February 20, 1978.