# SDR 2005FA0001067

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 2005
- Submitted: July 28, 2005
- Operation: General aviation
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Pressure Switch
- Part number: 94E42
- Condition: Failed
- Location: Heater
- Stage of operation: NR
- How discovered: C
- Nature of condition: L
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2005FA0001067

## Discrepancy

DURING COMBUSTION HEATER PRESSURE DECAY TEST IAW AD2004-21-05, WE STILL TEST THE COMBUSTION AIR PRESSURE SWITCH WITH P/N 94E42, AND FOUND THAT MOST OF THE TIMES THE SWITCH FAILED OR NEEDED ADJUSTMENT.

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