# SDR ASAA2021040834529

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 8, 2021
- Submitted: April 9, 2021
- Operation: Air carrier
- Aircraft: [N581AS](https://openairdocs.org/aircraft/N581AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35188
- Aircraft time: 49,243 hours, 14,675 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Display
- Condition: Locked
- Stage of operation: CL
- How discovered: O
- Nature of condition: P
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021040834529

## Discrepancy

MCP LOCKUP ON CLIMB -ALTITUDE ALERTING TONE/COULD NOT SILENCE -MCP ALT WINDOW INDICATING 50,000' PANEL UNLOCKED AFTER REACHING CRUISE LEVEL. GROUNDED - YES. ACCOMPLISHED BITE CHECK PER B737-800 AMM 22-11 TASK 803 OPS OK NO FURTHER ACTION TAKEN DEBRIEF.

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