Hello,

I have a question based on the Aircraft Systems Manual II p399 for ACCEL HT and I hoped someone could help.

"This is the Acceleration Height for flap retraction for all engines or one
engine out at which VNAV guidance will decrease pitch and begin
acceleration toward the target speed"

When the acceleration height has been entered into the CDU (TAKEOFF REF page 2 => ACCEL HT), does the flight director bar descent in pitch when the inputted altitude has been reached ? Or only if VNAV is engaged meaning VNAV is engaged before acceleration height ? The take off procedure of the Manual part III P35 only states to "Call for "VNAV" at flap retraction altitude.

I have done many tests but but it is not obvious that the bar descent.

Thank you for your help.
Mathieu