# SDR AALA20170509008

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 9, 2017
- Submitted: May 13, 2017
- Operation: Air carrier
- Aircraft: [N437AA](https://openairdocs.org/aircraft/N437AA), registered now
- Make and model: Doug MD 83
- Registry model: [Doug MD 83](https://openairdocs.org/model/mcdonnell-douglas-md-83) (OpenAirDocs)
- Aircraft serial: 49455
- Aircraft time: 89,310 hours, 42,539 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Regulator Valve
- Part number: 39271411
- Part serial: 3675
- Condition: Faulty
- Location: Cabin Pressure
- Part time: 60,862 hours, 30,373 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20170509008

## Discrepancy

AIRCRAFT WAS GROUNDED.  EMERGENCY DECLARED.  ORD-RDU FLIGHT RETURNED TO ORD ACCOUNT PRESSURIZATION ISSUES.  LANDING UNEVENTFUL.  REMOVED AND REPLACED LEFT AIR CONDITIONING PRESSURE REGULATOR VALVE IAW AMM 21-31-01 AND REPAIRED WIRE ON RIGHT AIR CONDITIONING PRESSURE REGULATOR VALVE CONNECTOR IAW AMM 21-00-00 (AALA201705109027).  OPERATIONAL AND LEAK CHECK GOOD.

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