Originally Posted by
LHRPony
Many thanks Vilas for your response.
I agree it would Target F speed if the speed was left managed, but as per the QRH your using SELECTED speed to VFE NEXT -5 (which is inside the VLS in this case) then the A/THR would reduce speed only VLS? As you ran the flap as per the QRH above VFE next, you will end up in the black & reds briefly but shouldn’t trigger a over speed warning as that’s done on actual position?
I know I must be missing something, I’m just trying to figure out what? And why they say you may need to disconnect the A/THR.
Many thanks for your input.
Yes! When VFE next is less than VLS even in select speed ATHR will maintain VLS which is still beyond the VFEnext. Since VLS is real time speed as you lower the next flap as the surface extends gradually the VLS also starts decreasing. Here for better control of speed ATHR is disconnected and once under control can be reengaged.