WASALOADIE,
ADS did indeed stand for Aerial Delivery System, although I have seen variations on that theme in different publications. As I recall the ADS arms had but a single micro switch which cut off the power to the ramp switch when the arms were fully extended but only when they were connected to the ramp.
Of course manual operation was rather different . Jungle line drops with the extended riser could be hit or miss at times. I wonder if we are acquainted.