# SDR W9FA2019F00105

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 7, 2019
- Submitted: January 8, 2019
- Operation: Air carrier
- Aircraft: N2
- Make and model: Cessna 560XL
- Registry model: [Cessna 560XL](https://openairdocs.org/model/cessna-560xl) (OpenAirDocs)
- Aircraft serial: 5333
- Aircraft time: 5,189 hours, 4,169 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 52770114
- Part serial: 05013
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/W9FA2019F00105

## Discrepancy

PRESSURIZATION FLUCTUATES AT LOWER ALTITUDES DURING CLIMB OR DECENT. FOUND OUT THROUGH TECHNICAL OPERATIONS THAT CONTROLLERS IN THE S/N RANGE OF 5000 THAT DID NOT HAVE MOD. LEVEL M EXPERIENCE THIS ISSUE.  REPLACED WITH S/N 1124.  ISSUE RESOLVED.  BASE ON A LETTER RECEIVED, MANUFACTURER IS AWARE OF THIS ISSUE AND IS WORKING ON A RESOLUTION TO THE PROBLEM.

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