# SDR N93A04062010

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 6, 2010
- Submitted: April 12, 2010
- Operation: Air carrier
- Aircraft: [N436QS](https://openairdocs.org/aircraft/N436QS), registered now
- Make and model: Gulstm GIV
- Aircraft serial: 1436
- Aircraft time: 7,758 hours, 3,787 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Safety Valve
- Part number: 10356812MR4
- Part serial: 18267
- Condition: Malfunctioned
- Location: Cabin Pressure
- Part time: 3,888 hours, 1,895 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/N93A04062010

## Discrepancy

DURING CLIMB, CABIN PRESURIZATION BECAME ERRATIC AND UNCONTROLABLE.  CREW DESCENDED IMEDIATELY.  CABIN LOW WARNING ILLUMINATED.  OPEN.

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