Regards ADS.
For that to operate didn't you have to be airborne (ground checks could be c/o using the ground test switch STBD side in the freight bay), door up & locked & ramp open to make the micro switch on the arms?
if you wern`t attached I am sure you could power into the airflow but like smudge assume that the change in A/C attitude would lead to some puzzled looks at the front end!