# SDR T17A20200811039

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 17, 2020
- Submitted: September 21, 2020
- Operation: Air carrier
- Aircraft: N493TM
- Make and model: Beech 400A
- Registry model: [Beech 400A](https://openairdocs.org/model/hawker-beechcraft-400a) (OpenAirDocs)
- Aircraft serial: RK582
- Aircraft time: 6,020 hours, 4,503 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Condition: Failed
- Location: Cabin Pressure
- Stage of operation: CR
- 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/T17A20200811039

## Discrepancy

VERY LOUD HISSING NOISE AT FL400, CABIN VSI WAS SHOWING A RAPID CLIMB AND BEGAN LOSE PRESSURIZATION.  REPLACED PRESSURIZATION CONTROLLER PERFORMED PRESSURIZATION CHECKS NO DEFECTS FOUND HAWKER 400A CH 21-30-00 AND 52-10-00.

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