Above, the MedEvac crew signals for the litter team to move in from the his side of the aircraft. The medical litter team will not approach the UH60 until they get this wave from the helicopter crew. The reason – Safety. When the rotors are spinning, this is called a “Hot Load”, and the pilots tilt the rotors so that the highest point of the blades are on the side of that crew member. Once this happens, then the crew gives the signal, and it’s safe to approach the aircraft from that side only.
note: This post is late due to communication issues