Originally Posted by
STBYRUD
It depends what lateral path you're flying in HDG SEL, but it will command the path equivalent to a point abeam the LNAV path... Needless to say that can be slightly unpredictable, so it's a good habit to change to a more reasonable pitch mode if you're departing the lateral FMC path.
Thanks for your answer STBYRUD, could you please give me more precision on « it depends what lateral path you’re flying in HDG SEL ».