# SDR AWXA200400370

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 15, 2004
- Submitted: April 16, 2004
- Operation: Air carrier
- Aircraft: [N818AW](https://openairdocs.org/aircraft/N818AW), registered now
- Make and model: Airbus A319-132
- Registry model: [Airbus A319-132](https://openairdocs.org/model/airbus-a319-132) (OpenAirDocs)
- Aircraft serial: 1375
- Aircraft time: 12,556 hours, 4,820 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Valve
- Part number: 750A000002
- Part serial: 00319
- Condition: Malfunctioned
- Location: Zone 138
- Part time: 35,400 hours, 16,112 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J, G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AWXA200400370

## Discrepancy

AT FL 310 COULD NOT CONTROL CABIN PRESSURE, 250 FPM TO 10000, DESCENDED DOWN TO 12000 FT AND DIVERTED.  PREVIOUS FLT A MEL WAS ISSUED FOR AFT CABIN TEMP & RT PACK FLOW CONTROL VALVE DE-ACTIVATED & LOCKED IN CLOSED POSITION.  MEL ALSO REQUIRES FLOW SWITCH BE PLACED IN HIGH POSITION, AFTER DIVERSION SWITCH FOUND IN NORMAL.  MX PERFORMED CABIN PRESSURIZATION CHECK USING PACKS 1 & 2 INDEPENDENTLY WITH FLOW SELECT SWITCH IN HIGH, COND 1, OPS NORMAL.  RE-ACCOMPLISHED PROCEDURE USING BOTH PACKS TOGETHER & OPS NORMAL.  PERFORMED BITE TEST OF CABIN PRESSURE CONTROLLERS 1 & 2, CHECKED GOOD.  BITE TEST OF CFDS FAILED AFT CABIN TRIM AIR VALVE 13HK FOR AFT CABIN TEMP PROBLEM.  R&R AFT CABIN TRIM AIR VALVE, OPS CHECK GOOD.

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