# SDR 9503039304

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 22, 1995
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N931MC](https://openairdocs.org/aircraft/N931MC), registered now
- Make and model: Doug DC-9-82
- Registry model: [Doug DC-9-82](https://openairdocs.org/model/mcdonnell-douglas-dc-9-82) (OpenAirDocs)
- Aircraft serial: 48057
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Press Control
- Part number: 21171801
- Condition: Malfunctioned
- Location: E/E Compartment
- Part time: 17,315 hours
- Stage of operation: CL
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9503039304

## Discrepancy

AIRCRAFT WOULD NOT PRESSURIZE WITH PRIMARY SYSTEM AFTER TAKEOFF.  SWITCHED TO STANDBY AND SYSTEM WORKED NORMALLY.  TRANSFER LOCKOUT AND STANDBY ON LIGHTS ILLUMINATED.  FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT.  REPLACED THE PRIMARY CABIN PRESSURE CONTROLLER.  OPERATIONAL CHECK OK ON GROUND.  AIRCRAFT RETURNED TO SERVICE.

---
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.