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fwballer

PMDG 747 A/T stops holding speed.

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Hello,

 

I need some help maybe someone knows what might be going on with my 747. During flight on cruise having VNAV, LNAV A/Tand autopilot armed the airplane stops holding speed. When I move the throttle manually I am able to reduce and increase even though everything is engaged. I use TO/GA when taking off and this happened while a long trip from KSFO to VHHH after a step climb to save some fuel not sure if that might have caused it. Please help thanks! 

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