What authority may authorize a helicopter equipped with a two-way radio to transit a Control Zone?

The authority that can authorize a helicopter equipped with a two-way radio to transit a Control Zone is Air Traffic Control (ATC). This is because ATC is responsible for managing aircraft movement within controlled airspace, including Control Zones, where specific procedures must be followed for safe operations. Helicopters operating in these areas need to communicate with ATC to ensure that their movements are coordinated with other air traffic, and ATC will provide the necessary clearances or instructions to facilitate safe transit through the Control Zone.

In a Control Zone, the presence of air traffic, including other aircraft taking off, landing, and maneuvering, can create safety concerns; hence, communication with ATC is essential. The local airport management, Transport Safety Board, and Transport Canada may have different roles and responsibilities, but they do not have the direct authority to grant transit clearance through a Control Zone, as that function is specifically assigned to ATC.