# SDR AALA202606038566

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 31, 2026
- Submitted: June 3, 2026
- Operation: Air carrier
- Aircraft: [N167US](https://openairdocs.org/aircraft/N167US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1442
- Aircraft time: 80,068 hours, 31,026 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Fcu
- Part number: 4419215
- Part serial: CUC19176
- Condition: Leaking
- Location: Zone 100
- Part time: 30,124 hours, 12,686 cycles
- Component: Apu, Hnywl, 1319A
- Component part number: 38007081
- Stage of operation: DE
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202606038566

## Discrepancy

AIRCRAFT WAS GROUNDED: FLIGHT DECK EXPERIENCED MODERATE "MOLDY SOCK" ODOR DURING IDLE POWER DESCENT INTO CLT. THE ODOR STRENGTH REDUCED IN INTENSITY WITH ENGINE N1 LEVELS WERE ABOVE 64%. ODOR WAS NOT NOTICEABLE ON GROUND DURING TAXI TO GATE OR ON APU BLEED SUPPLY. MAINTENANCE FOUND THE APU FUEL CONTROL UNIT LEAKING OIL INTERNALLY AND REPLACED IT PER AMM 49-32-11. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH ISSUES NOTED.

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