# SDR ASAA2018100326353

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 3, 2018
- Submitted: October 4, 2018
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 41,874 hours, 12,782 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Sensor
- Part number: 38762983
- Part serial: 1616222108185
- Condition: Failed
- Location: Apu
- Part time: 1,764 hours, 3,382 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018100326353

## Discrepancy

CDU APU BITE TEST OIL QTY SHOWS UNKNOWN APU BITE SHOWS MAINT MESSAGE 49-94304 OIL LEVEL SENSOR SHOWS CIRCUIT FAILURE. GROUNDED - YES. ACCOMPLISHED FIM TASK 49-90 TASK 811 AND DETERMINED OIL LEVEL SENSOR FAILURE. REPLACED SENSOR. CLEARED FAULTS. APU OIL LEVEL READS. FULL. SENSOR LEAK CHECKS GOOD. APU BITE TEST GOOD. REF AMM TASK 49-94-11-000-801, 49-94-11-400-801 & 49-60 TASK 801.

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