# SDR CA000501011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 2, 1999
- Submitted: January 19, 2001
- Operation: General aviation
- Make and model: Piper PA-31-350
- Registry model: [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Aircraft time: 5,996 hours
- Engine: Lyc LTIO540J2BD
- System (JASC): [2823 · Fuel Selector/Shut-Off Valve](https://openairdocs.org/jasc/2823)
- Part: O-Ring
- Part number: 757257
- Condition: Nicked
- Location: Shutoff Valve
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA000501011

## Discrepancy

(CAN) BOTH L/H & R/H FIREWALL SHUTOFF VALVES WOULD NOT COMPLETELY SHUTOFF FUEL TO ENGINE.  ON TEARDOWN OF VALVE O-RINGS WERE FOUND TO BE NICKED.THE O-RINGS ARE NICKED EVERYTIME THE VALVE IS OPERATED.  THE VALVES ARE OPERATED AS PART OF RUN-UP CHECKS.THE DESIGN OF THE VALVES IS SUCH THAT AS O-RING LUBRICATION IS WASHED AWAY BY REGULAR FLOW OF FUEL THE RING IS NICKED.

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