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B737 captain experiences a MCP lockup during arrival resulting in autopilot disconnect and a continuous altitude alert. The captain takes control and levels the aircraft while the first officer preforms the QRH procedure and restores the MCP to normal operation.
| Attributes | |
| ACN | 1000925 |
| Time | |
| Date | 201203 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | MCP |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 315 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
While on the arrival and in IMC; we encountered an MCP lockup. The autopilot kicked off and the MCP went to 888's. We could not silence the altitude alert. I took the controls and flew the plan manually and released the hgs combiner. I leveled off using the hgs. I told the first officer to pull out the QRH and run the MCP lockup checklist. The first officer reset four circuit breaker's and the MCP restored itself. Flight returned to normal.
Original NASA ASRS Text
Title: B737 Captain experiences a MCP lockup during arrival resulting in autopilot disconnect and a continuous altitude alert. The Captain takes control and levels the aircraft while the First Officer preforms the QRH procedure and restores the MCP to normal operation.
Narrative: While on the arrival and in IMC; we encountered an MCP lockup. The autopilot kicked off and the MCP went to 888's. We could not silence the Altitude Alert. I took the controls and flew the plan manually and released the HGS combiner. I leveled off using the HGS. I told the First Officer to pull out the QRH and run the MCP Lockup checklist. The First Officer reset four CB's and the MCP restored itself. Flight returned to normal.
Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.