# SDR NOCA10811

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 21, 2011
- Submitted: October 31, 2011
- Operation: Air carrier
- Aircraft: [N752NA](https://openairdocs.org/aircraft/N752NA), registered now
- Make and model: Boeing 757-28A
- Registry model: [Boeing 757-28A](https://openairdocs.org/model/boeing-757-28a) (OpenAirDocs)
- Aircraft serial: 28174
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Shutoff Valve
- Part number: 32143068
- Part serial: 1080
- Condition: Inoperative
- Location: Bleed Air Sys
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NOCA10811

## Discrepancy

A/C HAD AN AIR TURNBACK DUE TO LEFT ENGINE BLEED OFF LIGHT ILLUMINATED AFTER 80 KTS DURING TAKEOFF AFTER RESETTING THE ENGINE BLEED SWITCH THE LIGHT EXTINGUISHED.  THE LIGHT RE-APPEARED TIMES THROUGHOUT THE FLIGHT BOTH ENGINE DUCT PRESS WERE EVENLY MATCH BUT VARIED IN DIFFERENT OCCASIONS BY 23-30 PSI.  REPLACED PRSOV AS PER MM 36-11-09 LEAK AND OPS CHECK GOOD.

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