# SDR 2001UALA01752

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 17, 2001
- Submitted: September 5, 2001
- Operation: Air carrier
- Aircraft: [N667UA](https://openairdocs.org/aircraft/N667UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 29239
- Aircraft time: 10,062 hours, 3,504 cycles
- Engine: Pwa PW4052
- Engine time: 18 hours, 27 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Pressure Switch
- Part number: MR49902
- Part serial: 2371P
- Condition: Defective
- Location: Apu
- Part time: 600 hours
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2001UALA01752

## Discrepancy

APU NO START WITH 3 ATTEMPTS APU FAULT EICAS. REPLACED STARTER REF MM49-41-01 AND ECU REF MM 49-61-05. NO HELP. APU STILL WOULD NOT START. ECU SHOWED NR 1 SPEED SENSOR.  REPLACED APU BATTERY AND NR 1 MONOPOLE RUNS FOR APPROX 15 MIN THEN SHUTS DOWN. REPLACED AND INSTALLED GENERATOR FILTER DELTA PRESSURE SWITCH PER MM 49-27-15, APU WAS RUN FOR 1HR, OPS CHECK OK.

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