# SDR CVGA20120032

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 3, 2012
- Submitted: January 5, 2012
- Operation: Air carrier
- Aircraft: [N309AK](https://openairdocs.org/aircraft/N309AK), registered now
- Make and model: Raythn 400ARAYTHEON
- Aircraft serial: RK348
- Aircraft time: 4,254 hours, 4,074 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Cabin Pressure
- Condition: Malfunctioned
- Location: Cabin
- Stage of operation: DE
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CVGA20120032

## Discrepancy

PRESSURIZATION RATE SWINGS 2000 FT PER MIN ON DESCENTS.  CREW CAN HEAR OUTFLOW VALVES POPPING WITH POWER CHANGES.

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