Autothrottle

[sirtopper]

Hi and thanks for the continued updates loving them.

I have a thing happening with my auto throttle. While hand flying the last few hundred feet I disengage the auto pilot and deselect speed on the MCP for manual throttle control. I match up the ghost throttles and attempt to land. During my speed adjustments I notice that MCP speed button has  re-lit and so have I have press it again to disengage speed mode. Match ghost throttles and try again. This happened at least 3 times during my last approach.

What am I doing wrong? should I be disengaging auto throttle all together? I thought It needs to be armed in case of go around?

Tony

 

Edited May 29, 2016 by sirtopper
title change

[deimos256]

The way I do it is disarm autothrottle altogether, abut I'm pretty sure there are A/T disarm buttons on the sides of the throttles for that purpose. Once you have A/T disarmed then it doesn't matter what speed mode is selected because you have the control.

Edited May 30, 2016 by deimos256

[Litjan]

Hi Tony,

if you want to do it correctly, don´t use the disconnect buttons. The A/T disconnect buttons on the sides of the throttles are not used in normal flight, instead you disarm the speed mode just like you did. By disarming the A/T alltogether, you disable the speed reversion protection modes, too - something deemed too dangerous when carrying over 130 passengers ;-)

I could imagine that you are flying in very bumpy weather, and the speed mode is re-engaging in speed reversion mode to stop the airplane from going too slow or too fast? I would really need a video to see what is going on. Also notice that the speed mode will automatically engage whenever a new pitch mode (alt hold, GS, vertical speed, etc.) engages, this is normal and a safety feature.

Jan