# SDR CIEA2011122100001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 21, 2011
- Submitted: December 26, 2011
- Operation: Air carrier
- Aircraft: [N520MC](https://openairdocs.org/aircraft/N520MC), registered now
- Make and model: Beech 200BEECH
- Aircraft serial: BB43
- Aircraft time: 14,252 hours, 15,852 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Control Knob
- Part number: 1303466
- Part serial: 791277
- Condition: Faulty
- Location: Cockpit
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CIEA2011122100001

## Discrepancy

DURING RECEIVING INSP OF O/H PRESSURE CONTROLLER AND BEFORE INSTALLATION, FOUND THE "CAB ALT" KNOB BINDING INTERMITTENTLY AND MAKING A RATCHETING NOISE WHEN ADJUSTED.  PART WAS NOT INSTALLED ON ACFT.  NOTIFIED THE VENDOR THAT THE PART WAS PURCHASED FROM.  PLACED AN ORDER FOR A DIFFERENT CONTROLLER.

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