# SDR AALA20160313002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 13, 2016
- Submitted: March 16, 2016
- Operation: Air carrier
- Aircraft: [N9405T](https://openairdocs.org/aircraft/N9405T), registered now
- Make and model: Doug DC-9-83
- Registry model: [Doug DC-9-83](https://openairdocs.org/model/douglas-dc-9-83) (OpenAirDocs)
- Aircraft serial: 53141
- Aircraft time: 65,726 hours, 32,386 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Cabin Pressure
- Condition: Uncontrollable
- Location: Cockpit
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20160313002

## Discrepancy

AT 23,000 FEET, CABIN PRESS ALTITUDE WAS CLIMBING MORE THAN 1,500 FEET PER MINUTE.  ENG & WING ANTI-ICE WERE ON.  CLOSED OUTFLOW VLV, BUT COULDN`T CONTROL CABIN PRESS.  EMER DECLARED.  EMER DESCENT TO 10,000 FEET.  FLIGHT RETURNED WITHOUT FURTHER INCIDENT.  PERFORMED PRESS CONTROLLER CHECKS IAW 21-32-00, ACFT DECAY CHECKS IAW 21-00-00, OUTFLOW VLV CHECKS IAW 21-32-05, WIRING CHECKS IAW 21-31-00, & PACK CONFIDENCE CHECKS IAW 21-00-00, NO FAULTS FOUND.  THE ACFT WAS GNDED.

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