# SDR 2005FA0000724

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 3, 2005
- Submitted: May 16, 2005
- Operation: General aviation
- Aircraft: [N130BV](https://openairdocs.org/aircraft/N130BV), 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: 317952216
- System (JASC): [2140 · Heating System](https://openairdocs.org/jasc/2140)
- Part: Pressure Switch
- Condition: Failed
- Location: Cabin Heat
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2005FA0000724

## Discrepancy

PERFORMING AD ON THE AFFECTED HEATER IAW SB A-103.  UPON COMPLETION OF THE PRESSURE DECAY TEST, PERFORMED AND OPS TEST OF AIR PRESSURE SWITCH.  FOUND THE SWITCH FAILED IN A CONTACT CLOSED CONDITION.  UPON REMOVING THE SWITCH, NOTICED IT WAS A 94E42-1 SWITCH.  THIS IS THE PN THAT (ACCORDING TO SB A-103) HAS BEEN REDESIGNED TO ELIMINATE THE NOTED FAILURE MODE OF OLD SWITCH AND UPGRADE OLDER TECHNOLOGY HEATERS.(K)

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