# SDR ASAA2014091109119

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 11, 2014
- Submitted: September 15, 2014
- Operation: Air carrier
- Aircraft: [N590AS](https://openairdocs.org/aircraft/N590AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35687
- Aircraft time: 25,334 hours, 7,790 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Part number: 38007021
- Part serial: P7722
- Condition: Faulted
- Location: Apu Bay
- Part time: 8,794 hours, 11,782 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/ASAA2014091109119

## Discrepancy

APU CSS COMPLETED LESS THAN ONE HOUR PRIOR TO TOP OF DESCENT.  FIRST ATTEMPT AT FL380 WAS UNSUCCESSFUL WITH A FAULT LIGHT.  SECOND ATTEMPT AT FL380 WAS UNSUCCESSFUL WITH THE FAULT LIGHT. THIRD ATTEMPT AT FL310 HAD A SUCCESSFUL START.  ACFT GROUNDED.  REPLACED APU IAW T/C 78349-1- AND AMM 49-11-00-400-803 TC 78349015, 78349008, 78349001, 78349000, 78349016.

---
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.