Piper Service Bulletin No. 100
Applicability: Piper PA-12 serial numbers 12-1 thru 12-3988 with exceptions (see attached service bulletin for complete list)
Issue Date: October 20, 1947
Subject: Cowling Interference
Summary: Possibility of cowl attachments loosening and allowing the nose cowl to bear against the starter ring-gear casting near the propeller hub; in some cases, actually severing the casting.
Open PDF: PIP_SB100.pdf