Originally Posted by
FlightDetent
I lost you guys at #26.
If the Vls is above VFE(next) and A/THR engaged,
+ you select man speed sel VFEnext -5
+ ATH/R observes Vls
And nothing else happens. There will be no decrease of Vls as the flaps extend because they will not. You are still stuck at the original Vls that is above your VFEnext.
Hence the call for ATHR off, so that you can reduce into the Vls zone in order to deploy the flaps next notch. Only then observe the Vls dropping which creates the room to re-engage the ATHR.
In select speed with ATHR on it will maintain VLS is correct which otherwise would maintain F or S speed but you are supposed to select next flap at that VLS and they will extend (at any speed) but since speed is in select it will maintain same VLS is also correct. You don't reduce into VLS zone but follow the reduction of VLS itself which is taking place because the surface extension.
What he has quoted in #26 is from the procedure.