What is the reference line used as the runway centerline for a helicopter when determining separation with another aircraft?

• A. The helicopter landing path
• B. The helicopter takeoff course
• C. The runway centerline for fixed-wing traffic
• D. The ground track

Answer: (B)

The reference line used for helicopter separation is the helicopter takeoff course. This is the line that represents the intended path the helicopter will follow when departing, which ATC uses to measure lateral separation from other aircraft. The landing path is not the baseline for determining separation, because it reflects path during landing and can vary with wind and maneuvering. The runway centerline for fixed-wing traffic is specific to airplanes and isn’t the standard reference for helicopters in mixed airspace. The ground track shows where the helicopter actually travels, which can differ from the planned takeoff course due to winds and control inputs; separation decisions rely on the intended takeoff course, not the current ground track.