# SDR 2005FA0000708

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 8, 2004
- Submitted: May 12, 2005
- Operation: General aviation
- Aircraft: N250CT
- Make and model: Piper PA-31T1
- Registry model: [Piper PA-31T1](https://openairdocs.org/model/piper-pa-31t1) (OpenAirDocs)
- Aircraft serial: 3177820011
- Engine: Pwa PT6A60A
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Pressure Switch
- Part number: 94E42
- Condition: Broken
- Location: Heater
- Part time: 276 hours
- Component: Heater, Janitrol
- Component part number: FRIDE214EL
- 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/2005FA0000708

## Discrepancy

HEATER SHOWED SIGNS OF ABNORMAL COMBUSTION IE. SOOT TRAIL FROM FUEL DRAIN VENT.  UPON INVESTIGATION.  FOUND COMBUSTION AIR BLOWER FAN WHEEL ASSY HAD COME APART AND FODED HEATER.  FAN MOTOR WOULD STILL RUN.  AIR PRESSURE SWITCH HAD FAILED IN CLOSED POSITION IAW AD, SWITCH DOESN`T NEED OPS TESTING.  RECOMMENDED THAT ALL COMBUSTION AIR PRESSURE SWITCHES, BE TESTED AND THAT THE COMBUSTION AIR FAN WHEEL ASSY BE INSPECTED AT SAME INTERVALS AS IN AD.  (K)

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