If radio contact is not established, what is the closest a downwind helicopter can reenter the landing pattern?

When a helicopter is in a downwind position and cannot establish radio contact, the standard operating procedure indicates that the helicopter can reenter the landing pattern at a distance of 3 nautical miles from the ship. This distance provides a safe separation while allowing for adequate time to manage the approach and land the aircraft without creating conflicts with other traffic or operational hazards.

The 3 NM distance strikes a balance between ensuring the helicopter has sufficient altitude and airspeed to make a safe approach, while not being too far out that it complicates the flight operations, or too close that it may jeopardize safety. This practice is in line with established aviation guidelines designed to enhance situational awareness and facilitate orderly traffic management in busy airspace, especially in proximity to ships.