# SDR ASAA2021052234880

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 22, 2021
- Submitted: May 24, 2021
- Operation: Air carrier
- Aircraft: [N589AS](https://openairdocs.org/aircraft/N589AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35686
- Aircraft time: 48,746 hours, 14,446 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Fuel Control
- Part number: 4419215
- Part serial: CUC14185
- Condition: Leaking
- Location: Apu
- Part time: 13,447 hours, 18,332 cycles
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021052234880

## Discrepancy

APU OIL MONITORING DATA SHOWS OIL CONSUMPTION TO BE TRENDING HIGHER THAN EXPECTED. GROUNDED - YES. ACCOMPLISHED GVI OF TURBINE DUCT FOR EXCESSIVE OIL WITH VIDEO BORESCOPE THROUGH EGT PORT 1, NO OIL OR OIL STAINING NOTICED, IAW B737-800 FIM 49-95 TASK 801. WHILE ACCOMPLISHING FIM TASK 49-95 TASK 801 DETERMINED OIL CONSUMPTION DUE TO LEAK FROM FCU. REMOVED AND REPLACED FCU REF B737-800 AMM 49-31-11-400-801. OPS CHECK GOOD. NO OTHER LEAKS NOTED FROM FCU OR APU.

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