# SDR AALA20131215003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 15, 2013
- Submitted: December 30, 2013
- Operation: Air carrier
- Aircraft: N592AA
- Make and model: Doug DC-9-83
- Registry model: [Doug DC-9-83](https://openairdocs.org/model/douglas-dc-9-83) (OpenAirDocs)
- Aircraft serial: 53255
- Aircraft time: 69,733 hours, 30,195 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Actuator
- Part number: 20219742
- Condition: Inoperative
- Location: Cabin Pressure
- 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/AALA20131215003

## Discrepancy

STL CREW REPORTED BOTH TRANSFER LOCKOUT & STANDBY LIGHT ILLUMINATED WITH CABIN DIFFERENTIAL INCREASE & CABIN ALTITUDE DECREASING.  CYCLED PRESSURIZATION SWITCH BUT HAD NO EFFECT.  FLIGHT RETURNED STL LANDED WITHOUT INCIDENT.  AIRCRAFT REMOVED FROM SERVICE.  REPLACED OUTFLOW VLV ACTUATOR. SYSTEM GND CHECKED NORMAL OPERATION CLOSED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.