# SDR ASAA2019122431695

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 24, 2019
- Submitted: December 24, 2019
- Operation: Air carrier
- Aircraft: [N434AS](https://openairdocs.org/aircraft/N434AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 61620
- Aircraft time: 14,969 hours, 4,749 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Oil Cooler
- Part number: 1605642
- Part serial: 7737
- Condition: Leaking
- Location: Apu
- Part time: 4,439 hours, 8,118 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019122431695

## Discrepancy

APU HAS A HISTORY OF OIL SERVICING AND BLUE MAINTENANCE LIGHT ILLUMINATING CURRENT OIL CONSUMPTION IS HIGHER THAN EXPECTED. GROUNDED - YES. FOUND BACK SIDE OF APU OIL COOLER COATED IN OIL. REMOVED AND REPLACED APU OIL COOLER REF AMM 49-91-41, LEAK CHECK GOOD.

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