# SDR ASAA2018101026434

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 3, 2018
- Submitted: October 10, 2018
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 41,873 hours, 12,781 cycles
- System (JASC): [4970 · APU Indicating System](https://openairdocs.org/jasc/4970)
- Part: Module
- Part number: 38762871
- Part serial: GE6073
- Condition: Malfunctioned
- Location: Apu
- Part time: 11,536 hours, 17,378 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/ASAA2018101026434

## Discrepancy

APU HAS HISTORY OF INTERMITTENTLY LOGGING FAULT 49-72104. DMM SHOWS CIRCUIT FAILURE. GROUNDED - YES. ACCOMPLISHED APU BITE REF FIM 49-60 TASK 801. CURRENT STATUS SHOWS MESSAGE: 49-72104. PER TSR, REF FIM 49-70 TASK 807. NO DEFECTS NOTED. REF AMM 49-72-11. REMOVED AND REPLACED APU DMM.

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