# SDR DL76L071385

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 23, 2007
- Submitted: October 30, 2007
- Operation: Air carrier
- Aircraft: [N174DN](https://openairdocs.org/aircraft/N174DN), registered now
- Make and model: Boeing 767332
- Aircraft serial: 24802
- Aircraft time: 80,365 hours, 12,091 cycles
- Engine: Pwa PW4060
- Engine time: 60,792 hours, 10,603 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Shutoff Valve
- Part number: 77328810
- Part serial: 880111
- Condition: Malfunctioned
- Location: Nr 1 Engine
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DL76L071385

## Discrepancy

UNUSUAL AIR SURGE SOUND DURING TAXI IN LEFT ENG IS 23 PSI AND RT ENG IS 34.  REMOVED AND REPLACED LEFT ENG PRSOV, ENG RUN VALVE OP CHECKS GOOD.

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