# SDR 97UAL900697

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 10, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N588UA
- Make and model: Boeing 757222
- Aircraft serial: 26717
- Engine: Pwa PW2037
- System (JASC): [4950 · APU Bleed Air System](https://openairdocs.org/jasc/4950)
- Part: Shut Off Valve
- Part number: 2790598102
- Condition: Malfunctioned
- Location: Apu
- Part time: 14,678 hours
- Stage of operation: NR
- Nature of condition: O
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97UAL900697

## Discrepancy

APU AIR SHUTOFF VALVE WILL NOT GO TO CLOSED POSITION.  DEACTIVATED APU AIR BLEED SHUTOFF VALVE IN CLOSED POSITION.  *S/D*  REPLACED RELAYS K10280 AND K23 IN P37 PANEL WITH NO HELP.  REPLACED APU BLEED VALVE, CLEARED ECU AND DUCT PRESSURE WAS NORMAL.

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