# SDR ASAA2023100545459

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 5, 2023
- Submitted: October 6, 2023
- Operation: Air carrier
- Aircraft: [N407AS](https://openairdocs.org/aircraft/N407AS), registered now
- Make and model: Boeing 737-900ER
- Registry model: [Boeing 737-900ER](https://openairdocs.org/model/boeing-737-900er) (OpenAirDocs)
- Aircraft serial: 41731
- Aircraft time: 41,106 hours, 12,835 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Sensor
- Part number: 38762983
- Part serial: 1616222108450
- Condition: Faulty
- Location: Apu Oil Level
- Part time: 8,214 hours, 13,843 cycles
- Stage of operation: IN
- 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/ASAA2023100545459

## Discrepancy

APU FAULT CODE SHOWING - "49-94304 OIL LEVEL SENSOR SHOWS OPEN CIRCUIT FAILURE". GROUNDED - YES. REMOVED AND REPLACED APU OIL LEVEL SENSOR REF B737-900 AMM 49-94-11. LEAK CHECK AND OPC GOOD.

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