# SDR ZESA20180417001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 13, 2018
- Submitted: April 17, 2018
- Operation: Air carrier
- Aircraft: [N511TH](https://openairdocs.org/aircraft/N511TH), registered now
- Make and model: Cessna 560CESSNA
- Aircraft serial: 561
- Aircraft time: 5,897 hours, 4,808 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 52771318
- Part serial: K948
- Condition: Defective
- Location: Cabin Pressure
- Part time: 321 hours, 345 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ZESA20180417001

## Discrepancy

DURING TAKE OFF,   THE AIRCRAFT WOULD NOT PRESSURIZE IN AUTO OR MANUAL MODE DURING CLIMB, AIRCRAFT RETURNED TO DEPARTURE.  FOUND THE OUTFLOW VALVE DEFECTIVE.

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