# SDR ASAA2018020123354

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 1, 2018
- Submitted: February 5, 2018
- Operation: Air carrier
- Aircraft: [N593AS](https://openairdocs.org/aircraft/N593AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35107
- Aircraft time: 37,527 hours, 11,446 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Fcu
- Part number: 4419215
- Part serial: CUC13072
- Condition: Faulted
- Location: Apu
- Part time: 8,650 hours, 16,668 cycles
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018020123354

## Discrepancy

APU WITH A FAILED CSS ATTEMPTS WITH FAULT CODE 49-31016.  ACFT GROUNDED.   REMOVED AND REPLACED THE APU FUEL CONTROL UNIT IAW AMM 49-31-11. OPS & LEAK CHECKED NORMAL.

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