# SDR 20001218SH031

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 4, 2000
- Submitted: December 18, 2000
- Operation: General aviation
- Aircraft: [N928AR](https://openairdocs.org/aircraft/N928AR), registered now
- Make and model: Piper PA-34-220T
- Registry model: [Piper PA-34-220T](https://openairdocs.org/model/piper-pa-34-220t) (OpenAirDocs)
- Aircraft serial: 3449005
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Switch
- Part number: 75775694E423
- Condition: Malfunctioned
- Location: Cockpit
- Part time: 368 hours
- Component: Heater
- Component part number: B3500
- 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/20001218SH031

## Discrepancy

DURING SCHEDULED INSPECTION WHEN HEATER SWITCH SELECTED ON, HEATER DID NOT IGNITE.  FUEL WAS DRAINING FROM DRAIN.  TROUBLESHOOTING DETERMINED NO COMBUSTION AIR FLOW AND CONTINUITY BETWEEN THE TERMINALS OF P/N 94E42-3, (PIPER P/N 757-756) COMBUSTION AIR SENSE SWITCH.  COMBUSTION AIR BLOWER MOTOR BRUSHES WERE SHORT, AND WERE REPLACED.  COMBUSTION AIR SWITCH WAS REPLACED WITH NEW.  GROUND OPERATIONAL TEST WAS SATISFACTORY.  (X)

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