# SDR AALA202411133852

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 22, 2024
- Submitted: November 13, 2024
- Operation: Air carrier
- Aircraft: [N186US](https://openairdocs.org/aircraft/N186US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1701
- Aircraft time: 73,652 hours, 28,597 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Vent Line
- Condition: Contaminated
- Location: Zone 100
- Stage of operation: DE
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202411133852

## Discrepancy

AIRCRAFT WAS GROUNDED: DESCENDING THROUGH 10000 FEET STRONG SWEET ODOR BECAME PREVALENT IN THE FLIGHT DECK. JUST AFTER LANDING FLIGHT ATTENDANTS NOTIFIED US OF STRONG GYM SOCK SMELL BETWEEN DOOR 3 AND DOOR 4. CABIN FANS WERE TURNED OFF AND SMELL SUBSIDED SLIGHTLY. APU WAS OFF.  MAINTENANCE FOUND THE APU FUEL CONTROL UNIT (FCU) LEAKING AND REPLACED IT PER AMM 49-32-11. MAINTENANCE ALSO FOUND THE APU OIL COOLER TUBE CLOGGED AND CLEANED IT PER AMM 49-26-55 (AALA202411139033). MAINTENANCE ALSO CLEANED THE APU GEARBOX VENT LINE PER AMM 49-26-55 (AALA202411133852). A DECONTAMIANTION OF THE ENVIRONMENTAL CONTROL SYSTEM WAS ACCOMPLISHED PER TASK CARD 26L00021014. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.

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