Piper Service Letter No. 373
- Piper PA-22-108 Colt serial numbers 22-8000 thru 22-9256
- Piper PA-24 Comanche serial numbers 24-2176 thru 24-2987
- Piper PA-28 Cherokee serial numbers 28-1 thru 28-494
Issue Date: March 29, 1962
Subject: Installation of Oil Shields on Dry Vacuum Pumps
Summary: Installation of oil shields on Airborne Mechanisms Dry Vacuum Pumps, Models 113A1 and 113A5, to prevent oil or cleaning solvents from entering the vent holes in the face of the mounting flange.
Open PDF: PIP_SL373.pdf