# SDR ASAA2023070543939

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 5, 2023
- Submitted: July 11, 2023
- Operation: Air carrier
- Aircraft: [N506AS](https://openairdocs.org/aircraft/N506AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35690
- Aircraft time: 54,066 hours, 16,367 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Fuel Control
- Part number: 4419215
- Part serial: CUC18546
- Condition: Faulty
- Location: Apu
- Part time: 11,844 hours, 20,739 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023070543939

## Discrepancy

APU HAS REPORT OF MULTIPLE CSS ATTEMPTS WITH FAULT LIGHT AND FAULT MESSAGE 49-31016 INSTALLATION TASK AFFECTS APU ON DEMAND IN-FLIGHT START CAPABILITY. UPON COMPLETION, CONTACT MAINTENANCE CONTROL AND REPORT THAT THIS TASK HAS AFFECTED APU IN-FLIGHT START CAPABILITY, MEL 49- 99A IS REQUIRED PRIOR TO FLIGHT. GROUNDED - YES. REMOVED AND REPLACED APU FUEL CONTROL UNIT PER AMM 49-31-11. REMOVED AND REPLACED APU LUBE MODULE PER AMM 49-91-11OPS TEST GOOD. LEAK TEST GOOD. THIS CLEARS TSR714607.

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