# SDR Q0MF200107068

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 3, 2001
- Submitted: July 19, 2001
- Operation: Air carrier
- Make and model: Boeing 737823
- Aircraft serial: 30636
- Aircraft time: 927 hours, 949 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Part number: 38007021
- Part serial: P5873
- Condition: Inoperative
- Location: Apu Bay
- Part time: 879 hours, 972 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: M, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/Q0MF200107068

## Discrepancy

OUR AIRPLANE, B-16805, HAD APU AUTO-SHUTDOWN AFTER 3 OR 4 SOUNDS OF SURGE.APU BITE CHECK FOUND THAT MSG 49-21015 OVERTEMP SHUTDOWN¨. IAW MEL 49-1, CAT.¡§C¡¨, C/F TO DD ITEM.  FURTHER CHECK, FOUND THAT THERE ARE MANY METAL CHIPS IN THE GEARBOX. REPLACED THE APU AT JULY 8, 2001.

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