# SDR UIEA2021020300215

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 2, 2021
- Submitted: February 5, 2021
- 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: 99,584 hours, 20,662 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Condition: Fluctuates
- Location: Cabin
- Stage of operation: NR
- 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/UIEA2021020300215

## Discrepancy

OUTFLOW VALVE FLUCTUATES CABIN RATE +/- 100FPM EVERY 10-15 MINUTES.  PERFORMED BITE TEST WITH NO FAULTS FOUND AND PERFORMED MANUAL MODE CONTROL TEST WITH NO DEFECTS FOUND IAW AMM 21-31-00.

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