Just wondering what happens if you have a heavy aircraft, and Green Dot speed in clean config is higher than the preselected speed on the PERF CLIMB page.
The aircraft will fly the preselect speed on the PERF CLIMB page, even if below green dot. (or maneuvering speed of the current slats/flaps configuration - F, S, Green Dot)
FCOM 1 DSC-22_30-40 speed/mach control :
Note: The selected speed/Mach target may be set beyond VLS or VMAX, but when autothrust is active, the guidance limits the speed to VLS or VMAX.
Selected speed has priority over managed speed
e.g. some SID's require to fly 220kt, but the GD could be as high as 235kt. If you leave the speed managed, what will the aircraft fly?
If you leave the speed managed and retract the flap, I believe the aircraft will fly GD speed (235 knots) even if 220 knots is a speed constraint in the SID.
FCOM 1 DSC-22_30-40 speed/mach control :
The managed speed/Mach target may be set below maneuvering speed but
as long as the speed target is managed, the FMGS limits the aircraft to the
maneuvering speed of the current slats/flaps configuration (VAPP, F, S, Green
Dot).