48-01-02 PIPER: Applies to PA-12 Aircraft Serial Numbers 12-1 Through 12-1989; 12- 1991 Through 12-1993; 12-1997; 12-1999; 12-2001 Through 12-3443; 12-3445 Through 12- 3450; 12-3452 Through 12-3457; 12-3461 Through 12-3465; 12-3481; 12-3535 Through 12- 3542; 12-3553; 12-3901; 12-3903 Through 12-3934; 12-3936; 12-3940; 12-3941; 12-3943 Through 12-3954; 12-3961; 12-3964 Through 12-3970; and 12-3988.
Compliance required by February 1, 1948, and at each periodic inspection with modification not later than June 1, 1948.
Inspect for interference between the nose cowl and starter ring gear casting and for tightness of the cowl attachments. Replace gear casting if scored deeper than 1/32 inch.
Prior to June 1, 1948, install cowl support braces, Piper P/N 11410, to insure proper position and support of cowl. (Piper Service Bulletin No. 100 dated October 20, 1947, covers this same subject.)