# SDR 2004FA0000179

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 10, 2003
- Submitted: February 12, 2004
- Operation: General aviation
- Aircraft: N3581C
- Make and model: Piper PA-31-350
- Registry model: [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Aircraft serial: 318052091
- Engine: Lyc TIO540*
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Regulator
- Part number: A23D04
- Condition: Failed
- Location: Heater Fuel
- Part time: 154 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2004FA0000179

## Discrepancy

AD HAS YOU PERFORM PRESSURE LEAKAGE CHECK ON THESE HEATER FUEL PRESSURE REGULATORS.  WHEN NEW AND BEFORE INSTALLATION INTO AIRCRAFT.  WE FIND THAT MANY OF THESE UNITS FAIL AFTER A SHORT TIME OF USE.  THEY START LEAKING AROUND HOUSING DIAPHRAGM AND NOTICED FUEL STAIN FROM DRAIN ON THE NOSE SECTION OF THE AIRCRAFT.

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