# SDR URZR20170117001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 12, 2017
- Submitted: January 18, 2017
- Operation: General aviation
- Filed by: [Daher Aircraft, Inc, repair station URZR891L](https://openairdocs.org/faa-repair-station/URZR891L/daher-aircraft-inc.md) (OpenAirDocs)
- Aircraft: N930X
- Make and model: Socata TBM 700
- Registry model: [Socata TBM 700](https://openairdocs.org/model/socata-tbm-700) (OpenAirDocs)
- Aircraft serial: 1122
- Aircraft time: 82 hours, 61 cycles
- System (JASC): [2197 · Air Conditioning System Wiring](https://openairdocs.org/jasc/2197)
- Part: Wire
- Condition: Not Reported
- Location: Switch
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/URZR20170117001

## Discrepancy

THE PILOT CHANGED SWITCH POSITION FROM AUTO TO MAX DIFF AND EXPERIENCED LOSS OF BLEED AIR. PILOT WAS ALERTED BY A BLEED OFF MESSAGE, CABIN PRESSURE BEGAN TO DECREASE. INITIATED A DESCENT, RESET BLEED, STABILIZED PRESSURIZATION AND MADE UNEVENTFUL LANDING.   WIRING OF THE SWITCH MAY LEAD TO A MOMENTARILY OPEN CIRCUIT DURING THE SWITCH OPERATION. MODIFIED THE WIRING OF THE BLEED AND OVER TEMPERATURE SWITCH IAW SB70-237-01.

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