# SDR ASAA2015051811766

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 18, 2015
- Submitted: May 20, 2015
- Operation: Air carrier
- Aircraft: [N594AS](https://openairdocs.org/aircraft/N594AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35191
- Aircraft time: 27,506 hours, 8,397 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Display
- Condition: Malfunctioned
- Location: Altitude
- 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/ASAA2015051811766

## Discrepancy

MCP ALTITUDE WINDOW FREEZES UP WILL NOT LET PILOT SELECT DIFFERENT ALTITUDE INTERMITTENTLY.  ACFT GROUNDED.  ACCOMPLISHED FIM TASK 22-11, TASK 803, MODE CONTROL PANEL TEST PASSED NO FAULTS NOTED.

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