# SDR UIEA2020100902202

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 9, 2020
- Submitted: October 13, 2020
- Operation: Air carrier
- Aircraft: [N1997A](https://openairdocs.org/aircraft/N1997A), registered now
- Make and model: Boeing 767-33A
- Registry model: [Boeing 767-33A](https://openairdocs.org/model/boeing-767-33a) (OpenAirDocs)
- Aircraft serial: 27310
- Aircraft time: 98,906 hours, 20,433 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: CR
- 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/UIEA2020100902202

## Discrepancy

IN CRUISE, A/C PRESSURIZATION REPEATEDLY CYCLED TO A DESCENT THEN CLIMB BEFORE STABILIZING.  NOTED ON GAUGES AND PRESSURE ON PILOT EARS.  PERFORMED CONTROLLER BITE CHECK, NO FAULTS AND A/C PRESSURIZATION TO 4 PSI, IAW AMM 21-31-01.  NO DEFECTS NOTED.

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