# SDR ASAA2016082317788

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 23, 2016
- Submitted: August 25, 2016
- Operation: Air carrier
- Aircraft: [N423AS](https://openairdocs.org/aircraft/N423AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 35206
- Aircraft time: 13,456 hours, 4,364 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Oil Cooler
- Part number: 1605642
- Part serial: 5891
- Condition: Leaking
- Location: Apu
- Part time: 3,273 hours, 6,719 cycles
- Stage of operation: IN
- How discovered: O
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016082317788

## Discrepancy

REF TSR908126: APU OIL MONITORING DATA SHOWS OIL CONSUMPTION TO BE TRENDING HIGHER THAN EXPECTED.  ACCOMPLISHED FIM TASK 49-95-801 UP TO STEP E-1-B.  WHILE ACCOMPLISHING TSR 908126 FOUND APU OIL COOLER LEAKING.  ACFT GROUNDED.  REPLACED APU OIL COOLER, REF AMM 49-91-41, LEAK CHECK GOOD.

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