Piper Service Bulletin No. 63
- Piper J-3 Series serial numbers 6117, 6130, 6205, 6276, 6282 thru 9101 (incorporating aluminum yoke)
- Piper J-5 Series serial numbers 5-578 and up (incorporating aluminum yoke)
- Piper L-4, L-4A and L-4B up to serial number 9524
Issue Date: February 20, 1946
Subject: Stabilizer Aluminum Yoke Casting
Summary: Inspection of the stabilizer aluminum yoke casting, and if any cracks are apparent, the part should be replaced before further operation of the airplane.
Open PDF: PIP_SB63.pdf