# SDR ASAA2020121333698

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 13, 2020
- Submitted: December 18, 2020
- Operation: Air carrier
- Aircraft: [N529AS](https://openairdocs.org/aircraft/N529AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35198
- Aircraft time: 38,844 hours, 11,489 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Fcu
- Part number: 4419215
- Part serial: CUC12071
- Condition: Faulted
- Location: Apu
- Part time: 7,136 hours, 13,413 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/ASAA2020121333698

## Discrepancy

APU FAILED TO START, MTX FAULT MESSAGE 49-31016.  GROUNDED-YES.  REMOVED AND REPLACED APU FUEL CONTROL UNIT, PER B737-800 AMM 49-31-11.  OPERATIONS AND NO LEAKS NOTED.

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