48-13-04 PIPER: Applies to PA-12 Aircraft Serial Numbers 12-1 Through 12-3450; 12- 3452; 12-3454 Through 12-3467; 12-3469 Through 12-3471; 12-3473 Through 12-3491; 12- 3993 Through 12-3504; 12-3506; 12-3507; 12-3511 Through 12-3520; 12-3522 Through 12- 3531; 12-3533; 12-3535 Through 12-3543; 12-3545 Through 12-3548; 12-3553; 12-3901 Through 12-3958; 12-3960 Through 12-3962; 12-3965 Through 12-3976; 12-3983; 12-3984; 12- 3988; 12-3990 Through 12-3994.
Compliance required by May 1, 1948.
To avoid arcing between the fuse clip and the wire attachment plate on the fuse block caused by loosening of the fuse clip attaching rivets, replace rivets by No. 4 machine screws and stake threads.
(Piper Service Bulletin No. 105 dated February 18, 1948, covers this same subject.)