# SDR 2003F00149

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 19, 2003
- Submitted: March 19, 2003
- Operation: Air carrier
- Filed by: [Honeywell Aerospace US, LLC., repair station ZN3R030M](https://openairdocs.org/faa-repair-station/ZN3R030M/honeywell-aerospace-us-llc.md) (OpenAirDocs)
- Aircraft: [N23707](https://openairdocs.org/aircraft/N23707), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28768
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Part number: 38007021
- Part serial: P5199
- Condition: Flamed Out
- Location: Apu Bay
- Part time: 6,984 hours, 7,700 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2003F00149

## Discrepancy

APU REMOVED FROM AIRCRAFT WHEN APPARENT THERMAL DAMAGE WAS NOTED AT TAIL SECTION OF AIRCRAFT.  UPON RECEIPT OF APU AT HONEYWELL REPAIR STATION THE APU WAS EVALUATED IN A TEST CELL.  FLAMES OUT THE TAILPIPE WERE NOTED DURING TEST CELL OPERATION OF THE APU.  CURRENTLY ROOT CAUSE ANALYSIS IS BEING PERFORMED TO DETERMINE THE FAILRE MODE OF THE APU.

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