# SDR ASAA2021071235364

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 12, 2021
- Submitted: July 14, 2021
- Operation: Air carrier
- Aircraft: [N565AS](https://openairdocs.org/aircraft/N565AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35181
- Aircraft time: 54,189 hours, 16,150 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Fcu
- Part number: 4419215
- Part serial: CUC10825
- Condition: Faulted
- Location: Apu
- Part time: 11,833 hours, 23,097 cycles
- Stage of operation: CR
- 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/ASAA2021071235364

## Discrepancy

APU FAILED COLD SOAKED START AT FL 36000. EGT GOT TO 1050 AT WHICH TIME "FAULT" LIGHT ILLUMINATED AND IT TERMINATED THE START ATTEMPT. NOTE: APU START WAS NORMAL ON GROUND AT BOSTON. GROUNDED - YES. REMOVED AND REPLACED APU FUEL CONTROL UNIT REF B737-800 AMM 49-31-11. OPS CHECK, LEAK CHECK GOOD. REMOVED AND REPLACED APU LUBE MODULE REF AMM 49-91-11. OPS CHECK LEAK CHECK GOOD.

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