# SDR ASAA2022050638245

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 6, 2022
- Submitted: May 10, 2022
- Operation: Air carrier
- Aircraft: [N933AK](https://openairdocs.org/aircraft/N933AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44098
- Aircraft time: 377 hours, 104 cycles
- System (JASC): [4960 · APU Controls](https://openairdocs.org/jasc/4960)
- Part: Apu
- Condition: Warning Light
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022050638245

## Discrepancy

APU FAULT LIGHT ON START. GROUNDED - YES. FOUND FAULT CODES 49-61149 ECU INTERNAL FAILURE AND 49-61002 APU CONTROLLER DURING INTERROGATION OF OMF. REF B737-9 IFIM 49-60-00-810-848. RMVD AND RPLCD ECU . WHILE DOING ECU OPS TEST. FOUND DMM CIRCUIT FAILED. MESSAGE 49-72104. SYS REMAINS ON 49-11-01. PERFORMED APU OPS TEST, TEST NORMAL NO FAULT LIGHT IAW AMM 49-11-00-71-802.THIS CLEARS MEL 49-11-01 PLACARD REMOVED SEAMC ARNIE NOTIFIED.

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