# SDR O2JA131201001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 1, 2020
- Submitted: October 3, 2020
- Operation: Air carrier
- Aircraft: N131AJ
- Make and model: Lear 35A
- Registry model: [Lear 35A](https://openairdocs.org/model/gates-learjet-35a) (OpenAirDocs)
- Aircraft serial: 381
- Aircraft time: 20,536 hours, 13,144 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Cabin Pressure
- Condition: Malfunctioned
- Stage of operation: CR
- 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/O2JA131201001

## Discrepancy

CABIN ALTITUDE STARTED RISING AT 1000 FAM AT FL 430 IN CRUISE.  TRIED TO STABILIZE CABIN ALTITUDE MANUALLY USING CHERRY-PICKER BUT TO NO AVAIL.  FORCED TO PERFORM EMER DESCENT AND DECLARE EMERGENCY.

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