From the FAQ:
“Page 147 “The special abilities of officers and other HQ units
mounted on transports work as normal, as long as they are being
transported in soft-skinned or open-topped armoured transports.” Does
this mean that an observer in an open-topped or soft-skinned transport
can call air strikes and artillery barrages?
No, they cannot do that because you would need to
issue a Fire order to the observer, and you cannot do that
on transported models. That sentence allows the use of
passive abilities, which do not require specific orders, like
a medic’s area of effect, or the ability of an observer to spot
for indirect-firing units.”
.
