# SDR 98ZZZX4559

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 20, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N4112K](https://openairdocs.org/aircraft/N4112K), registered now
- Make and model: Piper PA-31-350
- Registry model: [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Aircraft serial: 318353006
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Heater
- Part number: A23D0475
- Condition: Malfunctioned
- Location: Heater
- Component: Janitrol, B4500
- Stage of operation: IN
- Nature of condition: K, W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/98ZZZX4559

## Discrepancy

FUEL WAS OBSERVED RUNNING OUT OF THE FUEL REGULATOR/SHUTOFF VALVE DRAIN CAVITY ON THE FRONT HEATER DURING A ROUTINE HEAT OR MAINTENANCE CHECK.  FURTHER INVESTIGATION REVEALED THE VALVE WAS LEAKING FROM THE MATING SURFACE BETWEEN THE VALVE BODY AND THE REGULATOR PORTION OF THE VALVE.  SUSPECT A TORN DIAPHRAGM IN THE REGULATOR.  REPLACED VALVE WITH A NEW UNIT.  HEATER FUNCTIONALLY CHECKED SATISFACTORY.  THIS IS THE FIFTH MALFUNCTION OF THIS VALVE ON THE COMPANY'S ACFT IN RECENT MONTHS.

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