# SDR ASAA2017120522785

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 5, 2017
- Submitted: December 6, 2017
- Operation: Air carrier
- Aircraft: [N493AS](https://openairdocs.org/aircraft/N493AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41727
- Aircraft time: 6,470 hours, 2,189 cycles
- System (JASC): [4960 · APU Controls](https://openairdocs.org/jasc/4960)
- Part: Ecu
- Part number: 707208601
- Part serial: 6505150201701
- Condition: Faulted
- Part time: 6,467 hours, 2,188 cycles
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017120522785

## Discrepancy

WHILE T/S APU FOUND FAULT CODE 49-72105 DMM SHOWS CIRCUIT FAILURE IN MAINT HISTORY STATS 3-25. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 49-70 TASK 808. RMVD AND INSTALLED NEW APU ECU REF 49-11-01 AND 49-61-12. ACCOMPLISHED INSTALL TESTS REF 49-61-12. ALL TESTS PASSED. SYS CKS NORMAL.

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