# SDR ASAA2019021628188

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 16, 2019
- Submitted: February 20, 2019
- Operation: Air carrier
- Aircraft: [N431AS](https://openairdocs.org/aircraft/N431AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43255
- Aircraft time: 21,199 hours, 6,982 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Selector
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019021628188

## Discrepancy

FLT ALT WINDOW ON PRESSURIZATION CONTROLLER ONLY SCROLLS BETWEEN 34000 AND 34500. GROUNDED - YES. TAPPED ON PRESSURIZATION CONTROLLER SELECTOR, ALT WINDOW SELECTS NORMAL. OPS NORMAL REF AMM 21-31-00.

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