# SDR TSAA0549007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 4, 2005
- Submitted: February 19, 2005
- Operation: Air carrier
- Aircraft: N748AL
- Make and model: Boeing 737-76N
- Registry model: [Boeing 737-76N](https://openairdocs.org/model/boeing-737-76n) (OpenAirDocs)
- Aircraft serial: 30050
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Part number: 38007021
- Part serial: P5010
- Condition: Defective
- Location: Apu Bay
- Stage of operation: CR
- How discovered: O
- Nature of condition: E
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/TSAA0549007

## Discrepancy

FLT 446, HNL-LAS: APU EGT SPIKE 660 DEGREES THEN FLUCTUATING AT CRUISE; FLT ATTENDANT REPORTED LOW RUMBLING SOUND; APU CPS FREQ BLANK; AMPS=0, VOLTS=1.  SHUTDOWN APU; FLIGHT ATTENDANT REPORTED RUMBLING SOUND STOPPED.  DIVERTED TO OAK, UNEVENTFUL LANDING.  REPLACED APU PER 737-700 MM 49-11-00-4 AND TASK 49-11-00-400-802.  NO FAULTS NOTED.  AIRCRAFT RETURNED TO SERVICE.  NO VIBRATION NOTED ON SUBSEQUENT FLIGHT VERIFICATION.

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