Shy,
"That is what the 7700 code was designed for! The co-pilot, or the crewman may well have attempted to do this."
Not sure about the Chinook and doubt they were much different but in my 3 Puma tours that is certainly something the Crewman was taught. In the single pilot op days he would be the only guy with the free hands and even when we nav/co pilot'd up he was still part of that loop for sure.