# SDR S2YA01004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 8, 2001
- Submitted: May 3, 2001
- Operation: Air carrier
- Aircraft: [N79SK](https://openairdocs.org/aircraft/N79SK), registered now
- Make and model: Beech 1900D
- Registry model: [Beech 1900D](https://openairdocs.org/model/beech-1900d) (OpenAirDocs)
- Aircraft serial: UE79
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Shutoff Valve
- Part number: 1143800595
- Condition: Failed
- 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/S2YA01004

## Discrepancy

FLT 1001 - MKE-STL - SHORTLY AFTER TAKEOFF, THE CREW COULD NOT PRESSURIZE THE CABIN AND MADE AN AIR-TURN-BACK.  THE CREW TOLD MAINTENANCE THEY COULD NOT LATCH THE FO DOCUMENT WINDOW.  MAINTENANCE FIXED THE WINDOW AND RETURNED THE A/C TO SERVICE.  SHORTLY AFTER THE SECOND TAKEOFF, THE CREW COULD NOT PRESSURIZE THE CABIN AND MADE AN AIR-TURN-BACK.  MAINTENANCE INSPECTED THE SYSTEM AND FOUND A BAD CHECK VALVE AT THE ACM.  MAINTENANCE REPLACED THE CHECK VALVE AND CHANGED THE RT PRSOV.  MAINTENANCE OPS CHECKED THE SYSTEM AND RETURNED THE AIRCRAFT TO SERVICE.  (M)

---
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.