# SDR AALA202502068925

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 4, 2025
- Submitted: February 6, 2025
- Operation: Air carrier
- Aircraft: [N4005X](https://openairdocs.org/aircraft/N4005X), registered now
- Make and model: Airbus A319-115
- Registry model: [Airbus A319-115](https://openairdocs.org/model/airbus-a319-115) (OpenAirDocs)
- Aircraft serial: 5753
- Aircraft time: 31,279 hours, 15,126 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Cooling Fan
- Part number: 361614011
- Part serial: P2581CC
- Condition: Leaking
- Location: Zone 100
- Part time: 31,963 hours, 13,594 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/AALA202502068925

## Discrepancy

AIRCRAFT WAS GROUNDED: ON DESCENT THROUGH 12000 AN ACRID SMELL IN THE FLIGHT DECK.  THEN AT 2000 FEET BEFORE ENTERING THE CLOUD DECK THERE WAS A MUSTY SMELL IN THE FLIGHT DECK. MAINTENANCE FOUND THE APU COOLER VENT LINE AND THE APU GEARBOX VENT ORFICE CLOGGED AND REPLACED THE VENT LINE PER AMM 49-52-51 (AALA202502066739) AND THE ORFICE PER AMM 49-26-55. (AALA202502068410) THE APU OIL COOLING FAN WAS CONTAMINATED WITH OIL AND WAS REPLACED PER IT AMM 49-52-51. (AALA202502068925). A DECONTAMINATION OF THE ENVIRIONMENTAL CONTROL SYSTEM WAS ACCOMPLISHED PER TASK 26L00021014. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO LEAKS OR ODORS NOTED.

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