# SDR ASAA2022013037301

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 30, 2022
- Submitted: February 1, 2022
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 51,713 hours, 15,528 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Fuel Control
- Part number: 4419215
- Part serial: CUC12001
- Condition: Leaking
- Location: Apu
- Part time: 9,130 hours, 16,230 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/ASAA2022013037301

## Discrepancy

FWD DRAIN PORT ON APU DRAIN MAST LEAKING OIL. GROUNDED - YES. REMOVED WITNESS DRAIN TEE ON SURGE CONTROL VALVE, FUEL CONTROL UNIT, IGV ACTUATOR. RUN APU AND FOUND OIL LEAKING FROM FCU DRAIN TEE. ALL TROUBLESHOOTING PER B737-800 AMM TASK 49-16-11. REMOVED AND REPLACED APU FUEL CONTROL UNIT IAW AMM 49-31-11 OPS AND LEAK CHECK GOOD GROUND VERIFICATION SUCCESSFUL.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.