# SDR AALA20170314007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 14, 2017
- Submitted: March 20, 2017
- Operation: Air carrier
- Aircraft: [N962TW](https://openairdocs.org/aircraft/N962TW), registered now
- Make and model: Doug MD 83
- Registry model: [Doug MD 83](https://openairdocs.org/model/mcdonnell-douglas-md-83) (OpenAirDocs)
- Aircraft serial: 53612
- Aircraft time: 49,564 hours, 24,446 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: 20495055
- Part serial: 483821
- Condition: Faulty
- Location: Ac Bay
- Part time: 11,319 hours, 5,793 cycles
- Stage of operation: CR
- 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/AALA20170314007

## Discrepancy

AIRCRAFT WAS GROUNDED.  DURING CLIMB, THE CREW REPORTED THE AUTO PRESSURIZATION SYSTEM FAILED. NO EMERGENCY DECLARED.  RETURNED TO DFW AND LANDED WITHOUT INCIDENT.  PRESSURIZATION FLOW LIGHT ILLUMINATED AT FL 30000 WITH CRUISE POWER (300-400 FPM).  GOOD PACKS, GOOD FLOW, REMAINING CONTROLLER WOULD NOT FULLY COMPLY UNTIL BELOW 12000 AIRCRAFT ALTITUDE, OUTFLOW VALVE FULLY CLOSED.  REMOVED AND REPLACED LEFT AND RIGHT COOLING TURBINE ASSEMBLIES.  OPERATIONAL CHECK GOOD.  SEE ALSO AALA201703209045

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