# SDR YYFA2012F00053

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 27, 2012
- Submitted: February 27, 2012
- Operation: Air carrier
- Aircraft: N120MN
- Make and model: Doug DC-9-83
- Registry model: [Doug DC-9-83](https://openairdocs.org/model/douglas-dc-9-83) (OpenAirDocs)
- Aircraft serial: 53120
- Aircraft time: 39,158 hours, 40,531 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Condition: Malfunctioned
- 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/YYFA2012F00053

## Discrepancy

ON CLIMBOUT, AUTO PRESSURE CONTROL PRIMARY AND STANDBY LOCKED OUT.  ACCOMPLISHED AN UNSCHEDULED LANDING.  ACFT WAS INSPECTED AND THE AUTO PRESSURIZATION SYS WAS DEFERED IAW MEL 21-24, CAT C.  ACFT DEPARTED, NO FURTHER DISCREPANCIES REPORTED ON THIS SYS.  SYSTEM RTS WAS ACCOMPLISHED AND AN AUTO PRESSURE CONTROLLER WAS REPLACED.

---
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.