# SDR ASAA2017051020718

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 10, 2017
- Submitted: May 12, 2017
- Operation: Air carrier
- Aircraft: [N566AS](https://openairdocs.org/aircraft/N566AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35182
- Aircraft time: 39,573 hours, 11,849 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Fcu
- Part number: 4419215
- Part serial: CUC15803
- Condition: Failed
- Location: Apu
- Part time: 40 hours, 80 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/ASAA2017051020718

## Discrepancy

CSS FAILED,  3 ATTEMPTED STARTS. FL360, SAT-45 DEGREE. APU WOULD HAVE ATTAINED AN EGT OF 1000 DEGREES BUT FAULT LIGHT WOULD ILLUMINATE AND START WOULD ABORT SEQUENCE.  ACFT GROUNDED. PERFORMED APU BITE IAW FIM 49-60 TASK 801. FOUND FAULT CODES 49-31016 AND 49-41010.  REMOVED AND REPLACED FUEL CONTROL UNIT IAW AMM 49-31-11. GROUND START VERIFICATION SUCCESSFUL, NO LEAKS NOTED, NO FAULTS NOTED.

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