Service Bulletin No. 511A
Piper PA-39 Twin Comanche C/R · Systems Description
Overview
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.
Document
Source
Originally published by pipercomanche.info. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Systems Description
- Year
- 1976
- Pages
- 2
- File size
- 117 KB
- Publisher
- pipercomanche.info
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In this document
Purpose
The purpose of this service bulletin is to address a reported issue where the oxygen flow to the pilot may be interrupted due to the disengagement of the oxygen supply line from the outlet receptacle. This could lead to a critical loss of oxygen supply if not detected. The bulletin provides two methods to prevent this issue: installing a plug-in coupling 'O' ring kit or replacing the existing outlet receptacle with a refined version that has a locking mechanism.
Compliance Time
The compliance time for the recommended actions is at the next regularly scheduled inspection, which could be a 100-hour inspection, an annual inspection, or a Programmed Inspection Event. This must be completed not to exceed the next 100 hours of operation.
Material Required
For the corrective actions, the following materials are required: 1) One Oxygen Plug-In Coupling 'O' Ring Kit (Piper part number 761 032), which contains enough 'O' rings for up to ten plug-in couplings, priced at approximately $3.64. 2) Alternatively, the replacement of the oxygen system outlet receptacle (Piper part number 752 583) is needed, with a unit price of about $17.69, depending on the number of outlets in the aircraft.
Instructions
The bulletin provides specific instructions for the installation of the plug-in coupling 'O' ring kit and details on how to replace the existing outlet receptacle. These instructions are critical to ensure proper engagement and prevent any inadvertent loosening of the oxygen supply line.
Availability of Parts
Parts required for the modifications can be obtained through your Piper Field Service Facility. It is advised to contact them to arrange for the necessary materials.
Safety notes
- Failure to address the oxygen flow issue could result in a loss of oxygen supply to the pilot.
Full document text
Piper Aircraft Corporation Lock Haven, Pennsylvania, U. S.A. “Modification DOA EA -1 Approved” September 24, 1976 S/M 1 (Supersedes and Voids Service Bulletin No. 511 dated September 16, 1976) Subject: Oxygen System Outlet Refinement Reason for Revision: Corrected PA -39 “Serial Numbers Affected” I Models Affected: Serial Numbers Affected: PA -23-250 (6 place) Aztec PA -24-260 Comanche PA -24-400 Comanche PA-30 Twin Comanche PA -39 Twin Comanche “C/R” PA -31, PA -31-300 and PA -31-325 “C/R” Navajo PA -31-350 Navajo Chieftain PA -3lP Pressurized Navajo PA -3lT Cheyenne 27 -2000 to 27 -7654059 Inclusive* 24-3642, 24-4000 to 24-5047 Inclusive* 26-2 to 26-148 Inclusive* 30-l to 30-2000 Inclusive* 39-l to 39-155 Inclusive* 31-2 to 31-7612062 Inclusive* 31-5001 to 31-7652099 Inclusive* 31P-1 to 31P-7630010 Inclusive* 31T -7400002 to 31T -7620028 Inclusive* *With oxygen system installed (production installations or Piper field installation oxygen system kits). Compliance Time : At the next regularly scheduled inspection (100 hour, annual or Programmed Inspection Event), not to exceed the next 100 hours of operation. Purpose : A field report has been received describing an interruption of oxygen flow to the pilot due to disengagement of the oxygen supply line from the oxygen outlet receptacle. If undetected, this condition could result in loss of oxygen supply to the pilot. This service release announces two (2) methods by which the above condition can be prevented: 1. Installation of a plug-in coupling “0” Ring kit (“0” rings installed over the plug-in coupling stem to insure engagement friction with the mating receptacle); Replacement of existing outlet receptacle assembly with a refined receptacle incorporating a locking device to prevent inadvertant loosening and possible disengagement of the oxygen plug-in coupling. over I Service Bulletin No. 511A Purpose: (Continued) Refer to Material Required section below for material details. Instructions: I Plug-in coupling “0” Ring installation Number 761 032. Material Required: instructions are contained in Piper Kit Page 2 of 2 1. One (1) each per aircraft Oxygen Plug-In Coupling “0” Ring Kit Piper part number 761 032 (contains sufficient “0” Rings for a maximum of ten (10) plug-in couplings) @ suggested unit list price $3.64E. or 2. Receptacle, Oxygen System Outlet, Piper part number 752 583 @ suggested unit list price $17.69E; quantities as necessitated by the number of oxygen system outlets in the aircraft (from four to ten outlets, depending on aircraft model and/or interior configuration). Availability of Parts : Your Piper Field Service Facility. Effectivity Date: This service bulletin is effective upon receipt. Summary : Please contact your Piper Field Service Facility to make arrangements to obtain the oxygen system product refinement material described in the body of this service release.