Piper PA-39 Twin Comanche C/R — Systems Description

This document is a service bulletin from Piper Aircraft Corporation regarding the oxygen system outlet refinement for various aircraft models, including the Piper PA-39 Twin Comanche C/R. The bulletin addresses a potential issue with the oxygen supply line disengaging from the outlet receptacle, which could lead to a loss of oxygen supply for the pilot. It outlines corrective actions that can be taken during the next scheduled inspection, including the installation of a plug-in coupling 'O' ring kit or the replacement of the existing outlet receptacle with a refined version that includes a locking device. The document provides details on compliance times, materials required, and instructions for the installation of the recommended solutions.

• The service bulletin addresses a potential oxygen flow interruption issue for the PA-39 Twin Comanche C/R.
• Compliance is required at the next scheduled inspection, not exceeding 100 hours of operation.
• Two corrective actions are recommended: install an 'O' ring kit or replace the outlet receptacle with a refined version.
• The 'O' ring kit (part number 761 032) costs approximately $3.64 and is sufficient for ten couplings.
• The replacement outlet receptacle (part number 752 583) costs about $17.69, depending on the number of outlets.