# SDR 2015F00109

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 22, 2015
- Submitted: September 24, 2015
- Operation: General aviation
- Aircraft: [N525BY](https://openairdocs.org/aircraft/N525BY), registered now
- Make and model: Cessna 525B
- Registry model: [Cessna 525B](https://openairdocs.org/model/cessna-525b) (OpenAirDocs)
- Aircraft serial: 525B0014
- Aircraft time: 2,839 hours, 2,225 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 52771339
- Part serial: 889B
- Condition: Intermittent
- Location: Cabin Pressure
- Part time: 2,839 hours, 2,225 cycles
- Stage of operation: DE
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B, G
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2015F00109

## Discrepancy

LOSS OF CABIN PRESSURIZATION DURING DESCENT, DESCENDING THROUGH THE LOW 30'S.  O2 MASKS DEPLOYED IN CABIN, CREW DONNED OXYGEN MASKS, CABIN HELD AT CABIN PRESSURE ALTITUDE OF 14,000 FEET.

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