# SDR 97UAL900666

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 3, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N542UA](https://openairdocs.org/aircraft/N542UA), registered now
- Make and model: Boeing 757222
- Aircraft serial: 25276
- Engine: Pwa PW2037
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Diffuser
- Part number: 38262821
- Condition: Misrepaired
- Location: Apu Compressor
- Stage of operation: IN
- How discovered: O
- Nature of condition: W
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97UAL900666

## Discrepancy

APU PRESSURE GOES TO ZERO ON ENGINE START AND GENERATOR GOES OFF-LINE.  APU PNUEMATIC AND ELECTRICAL INOP.  APU INOP.  *S/D*  AFTER REMOVING CHRONIC APU, FOUND DRIVEN COMPRESSOR DIFFUSER WITH VERY CRUDE REPAIR TO LEADING EDGES OF THE VANES.  ALSO, IGV VANES WERE VERY STIFF.  CHRONIC APU REPLACED PER MM 49-11-01, AND OPS CHECKED GOOD.

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