Or rather one skid hanging low, depending on which way the rotors spin. Helicopters using anticlockwise rotation will have the tail rotor thrust slightly out of alignment with the main rotor, because they are set to be level with each other in the cruise. As a result, the TR thrust line is below the level of the MR hub and will produce a couple that makes the left skid lower in the hover - the reverse for clockwise rotating rotors.
Should an anticlockwise rotating helicopter end up hovering
right skid low, you've left the refuelling hose in
Phil