Originally Posted by
CBreezy
If you set V2 in the speed window prior to takeoff, selecting AP on at 400 feet would maintain V2 speed and reverts to a type of LVL CHG mode. It does not sequence the bug to flap retraction speed. Once at acceleration height and upon reached the new bugged speed, you would select LVL CHG to continue your next segment climb.
This is correct, we select LVL CHG and max continuous thrust once we get to clean maneuvering speed. Selecting VNAV on the ground is our norm as well and when you get to the acceleration height (usually at a minimum of 800’) on page 2 of the takeoff page, the aircraft will accelerate for clean up. If you depart without VNAV, or on a go-around, selecting LVL CHG at 400’ would be a bad move since it would lower the nose to accelerate to your selected speed when your priority should be getting away from the ground. VNAV or TOGA at 400’ is acceptable, selecting LVL CHG that low isn’t.