# SDR AWXA200400556

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 20, 2004
- Submitted: May 21, 2004
- Operation: Air carrier
- Aircraft: [N625AW](https://openairdocs.org/aircraft/N625AW), registered now
- Make and model: Airbus A320-231
- Registry model: [Airbus A320-231](https://openairdocs.org/model/airbus-industrie-a320-231) (OpenAirDocs)
- Aircraft serial: 064
- Aircraft time: 45,928 hours, 20,804 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: 763A000003
- Condition: Malfunctioned
- Location: Zone 190
- Component: Bypass Valve
- Component part number: 758A000002
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: H, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AWXA200400556

## Discrepancy

AIR TURN BACK ON CLIMB OUT, RECEIVED ECAM MESSAGE FOR PACK 1, NR 2 FAULT WITH ASSOC PACK 2 OVERHEAT. PASSING THROUGH FL 250 ECAM DIRECTED NR 2 PACK BE TURNED OFF, NR 1 PACK ALREADY ON MEL, AS A/C DESCENDED BELOW 10000 FT, NR 2 PACK TURNED OFF & OVERHEAT CONDITION CLEARED, TURNED NR 2 PACK BACK ON & SYS WORKED OK FOR REMAINDER OF FLT, BUT NR 2 PACK TEMP REMAINED HOT. MAINT TROUBLESHOT AC PACKS 1, 2, PREFLT REPORT INDICATED PACK 2 BYPASS VALVE & OUTLET TEMP SENSOR (35HH). R & R PACK 2 OUTLET TEMP SENSOR (35HH) IAW AMM, & BYPASS VALVE, LEAK & OPS CHECK GOOD. REPLACED FLOW CNTRL VALVE FOR PACK NR 1, PROBLEM STILL EXISTS, SYS REMAINS ON MEL. TEARDOWN ANALYSIS OF AIR CYCLE MACHINE S/N 01404 CONFIRMED FAILURE OF UNIT.

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