# SDR ASAA0853940

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 1, 2008
- Submitted: December 3, 2008
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 9,602 hours, 2,844 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Filter
- Condition: Unknown
- Location: Apu Oil Cooler
- Part time: 60 hours, 14 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA0853940

## Discrepancy

JUST PRIOR TO PUSH APU LOW OIL PRESS LIGHT ON THEN APU SHUT OFF PERFORMED FIM TASK 49-60-00-810-801 MX MSG 49-91007 LOP 49-91005 HIGH OIL TEMP SHUTDOWN.  PERFORMED FIM 49-90-00-810-803 FOR LOW OIL PRESS.  REMOVED AND REPLACED LOW OIL PRESS SWITCH REF AMM 49 94 22 400 801 FIM 49-90-00-810-801 HIGH OIL TEMP.  REMOVED AND REPLACED TEMP CONT VALVE OIL COOLER LUBE FILTER REF AMM 49-91-21-400-801-49-91 41-000-801 AND 49-91-21-400-802.  APU OPERATIONAL AND LEAK CHECK GROUND OPERATION TEST PASSED REF 49-11-00-710-801.  VERIFICATION FLIGHT SATISFACTORY .

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