SB-109 Piper PA-12/PA-14 Cracking of Aileron and Flap Bellcranks

Piper Service Bulletin No. 109

Applicability:

  • Piper PA-12 serial numbers 12-1 and up
  • Piper PA-14 serial numbers 14-1 thru 14-193

System: Control

Issue Date: November 9, 1948

Subject: Cracking of Aileron and Flap Bellcranks

Summary: Reports of cracks in the cast aluminum aileron bellcranks due to excessively tightening of the bolt which attaches the aileron push rod to the bellcrank.

Open PDF: PIP_SB109.pdf