I remember a colleague long time ago giving a plausible explanation on Boeings logic to have the Flight director pitch mode at aprox 8º pitch up while on ground.
I have tried to find an explanation on the manuals but have been unsuccessful.
Possible explanations found and ruled out have been:
Initial pitch after T/O: Initial pitch should be 15º, Flight director after airborne would target a pitch of V2+15..... (so based on speed) Also applicable on Engine failure.
Tail strike avoidance: Doesn't make sense as 777 varies from 12.1º to 10º and 787-9 around 9.7º so an 8º would still cause it.
Any other ideas?
