# SDR ASAA2016050416640

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 4, 2016
- Submitted: May 9, 2016
- Operation: Air carrier
- Aircraft: [N471AS](https://openairdocs.org/aircraft/N471AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41703
- Aircraft time: 6,295 hours, 2,076 cycles
- System (JASC): [4960 · APU Controls](https://openairdocs.org/jasc/4960)
- Part: Module
- Part number: 38762871
- Part serial: GE3766
- Condition: Failed
- Location: Apu
- Part time: 10,808 hours, 18,813 cycles
- Stage of operation: LD
- 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/ASAA2016050416640

## Discrepancy

AFTER LANDING ATTEMPTED, APU START FAILED. INDICATED "FAULT".  ACFT GROUNDED.  TROUBLESHOOT IAW FIM 49-70, TASK 808, STEP 7 AND STEP 8.  REPLACED ECU, REF AMM 49-61-12.  REPLACED DATA MEMORY MODULE, REF AMM 49-72-11.  OPS TEST NORMAL, GROUND VERIFICATION SUCCESSFUL.  THIS CLEARS MEL 49-1B.

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