# SDR DALA2019052803307

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 24, 2019
- Submitted: May 29, 2019
- Operation: Air carrier
- Aircraft: [N6704Z](https://openairdocs.org/aircraft/N6704Z), registered now
- Make and model: Boeing 757232
- Aircraft serial: 30396
- Aircraft time: 64,818 hours, 24,064 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Condition: Faulty
- Location: Cabin Pressure
- Stage of operation: TO
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2019052803307

## Discrepancy

SHIP 6704 -ATB- RETURNED TO ATL DUE TO LOSS OF THE NR 1 AND NR 2 AUTO PRESSURE CONTROLLERS. CORRECTIVE ACTION: BOTH CONTROLLERS FAULT AC MOTOR REPLACED OUTFLOW VLV. MTC FOUND UPPER PRESSURE RELIEF VLV TRIPPED, REPLACED SAME.

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