47-20-02 AERONCA: (Was Mandatory Note 2 of AD-761-2 and Mandatory Note 2 of AD-759-3.) Applies to 7AC Airplanes Having Serial Numbers 226 to 3721; and 11AC, Serial Numbers 1 to 351.
Compliance required at next periodic inspection but not later than August 1, 1947.
To prevent the oleo strut assembly from separating in flight, replace the fiber piston with aluminum pistons. (Supplementary to Aeronca Service Helps and Hints No. 12 dated February 11, 1947, covers this same subject.)