# SDR UALA2010110804151

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 6, 2010
- Submitted: November 17, 2010
- Operation: Air carrier
- Aircraft: [N219UA](https://openairdocs.org/aircraft/N219UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30551
- Aircraft time: 40,901 hours, 5,036 cycles
- Engine: Pwa PW40903
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Part number: 38005501
- Part serial: P1059331
- Condition: Faulty
- Location: Apu
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2010110804151

## Discrepancy

FOUND APU CONTROL MSG ON. MESSAGE STARTED HITTING AFTER SUCCESSFUL ALT START (19 OCT) AFTER APU INSTALLED. APUC REPLACED ON 20OCT, NR 2 SPEED SENSOR 24OCT &  29OCT & FINALLY NR 1 SPEED SENSOR 03NOV. CHECK MAT TO ENSURE LAST LATCHED STATUS MESSAGE WAS ERASED. PREV HIT: WIRE CHECK PER FIM 49-60 FOUND NO DAMAGE. INSTALLED APU. ALSO CHECKED CONNECTORS AND PINS AT FIRE WALL FOR APU ALL NORMAL.

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