# SDR ASAA2018101226433

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 8, 2018
- Submitted: October 12, 2018
- Operation: Air carrier
- Aircraft: [N468AS](https://openairdocs.org/aircraft/N468AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41735
- Aircraft time: 17,104 hours, 5,696 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Fcu
- Part number: 4419215
- Part serial: CUC20144
- Condition: Faulty
- Location: Apu
- Part time: 17,133 hours, 5,701 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018101226433

## Discrepancy

APU OVERSPEED LT AND AUTO SHUTDOWN ON TAXI IN. GROUNDED - YES. PERFORMED APU BITE TEST FOUND FAULT APU OVERSPEED MSG 49-31014. APU REMAINS ON MEL 49-1B. PERFORMED FIM 49-30 TASK 802. PER FIM TASK, REMOVED AND REPLACED THE FUEL CONTROL UNIT REF AMM 49-31-11. PERFORMED APU OPS TEST, REF AMM 49-11-00-710-801. OPS CHECK GOOD. APU FAULT HISTORY DID NOT SHOW MSG 49-31014 ON LAST APU CYCLE. THIS CLEARS MEL 49-1B.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.