I noticed that the PMDG-737 has two A/P buttons.One located on the captain's yoke,the other one on the

MCP ( on the right side )

 

What is the difference between the two.I read in the London-Amsterdam tutorial to use the A/P on the MCP

after reaching 400 feet.

 

Can anybody explain the difference.

 

HubertWerni

The yoke button is regular device for disconnecting the A/P.

 

The MCP A/P disconnect is more of a back-up in case the yoke button doesn't work. It's more like an ON/OFF switch. If it's OFF, you can't engage the A/P. The yoke swtich just disconnects the A/P and you can reconnect via the CMD A/B switches.

 

I've never used MCP switch.

The Control column autopilot disengage switch is a Electric disconnect of the autopilot. The disengage bar on the Mode Control Panel is a mechanical disconnect of the autopilot. The flight crew uses the disengage bar when the disengage switch fails to disconnect the autopilot.

 

 

Mark.

Boeing 737-6/7/8/900(ER) Ground Engineer.