OK, thanks skkm. So like the Airbus, the Boeing FMA speed box will always display the Autothrust status, and only if it is inactive and unarmed, will the speed box ever be blank?
In that case I return to my personal opinion that this enhancement is not required and adds extra clutter.
The SPD annunciation moves over to the vertical FMA box because the speed is now being controlled by pitch rather than the autothrottle.
Yeah, I realised that, my point was that in the example the speed box was blank while the speed
was being controlled, (by the elevators), leading to a potential negative as PEI3721 picked up.
