December 21, 20196 yr Hi All, I have an issue on the last couple of flights on the descent. I'm running the 737 ngx through a CP MCP. I turn the speed knob down to the required speed and the bug reduces as you would expect and the auto throttle reacts accordingly. The problem is almost immediately the speed bug on the CP MCP reverts back to the max of 400 kts so i keep having to wind it all the way back to the required bug speed again and then the whole process starts again! Very awkward on short finals as the auto throttle suddenly tries to achieve 400kts!!! Any ideas as whats wrong here? Many thanks
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