# SDR 3EJA2025071000925

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 9, 2025
- Submitted: July 10, 2025
- Operation: Air carrier
- Aircraft: [N752JS](https://openairdocs.org/aircraft/N752JS), registered now
- Make and model: Cessna 525B
- Registry model: [Cessna 525B](https://openairdocs.org/model/cessna-525b) (OpenAirDocs)
- Aircraft serial: 525B0228
- Aircraft time: 9,218 hours, 6,308 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Cabin Pressure
- Condition: Leaking
- Location: Zone 200
- Stage of operation: DE
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/3EJA2025071000925

## Discrepancy

SHORTLY AFTER BEGINNING OUR DESCENT FROM 45,000 FT. I LOOKED DOWN AT THE PRESSURE CONTROLLER AND CABIN ALTITUDE GAUGE AND NOTICED A CABIN CLIMB OF GREATER THAN 1,000 FPM AND INCREASING WHILE THE CABIN ALTITUDE GAUGE WAS COINCIDING WITH DECREASING PRESSURIZATION. MADE A COMMENT THAT WE WERE LOSING PRESSURIZATION AND THAT WE NEEDED TO LET ATC KNOW. AT THAT TIME WE GOT A CABIN ALT LIGHT. THE CABIN ALTITUDE REACHED APPROXIMATELY 14,000 FT BEFORE THE CABIN STARTED DESCENDING AGAIN.

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