# SDR ASAA2015050211609

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 2, 2015
- Submitted: May 6, 2015
- Operation: Air carrier
- Aircraft: [N461AS](https://openairdocs.org/aircraft/N461AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36363
- Aircraft time: 4,309 hours, 1,432 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Apu
- Part number: 38007021
- Part serial: P8550
- Condition: Faulted
- Location: Apu Bay
- Part time: 5,021 hours, 8,620 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/ASAA2015050211609

## Discrepancy

WHILE PERFORMING AN APU START AT FL 340 FOR A CSS ON RELEASE THE APU FAULT LIGHT ILLUMINATED WITH AUTOMATIC SHUTDOWN AFTER RUNNING THE QRH PROCEDURE THE FAULT LIGHT EXTINGUISHED APPROXIMATELY 4 MINUTES LATER SECOND ATTEMPT 10 MIN LATER ALSO PRODUCED FAULT LIGHT APU STARTED NORMALLY ON 3RD ATTEMPT AT FL 300.  ACFT GROUNDED. REPLACED THE APU ASSY REF AMM 49-11-00 AND TC 78349010. OPS CHECK AND LEAK CHECK GOOD.

---
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.