What is the maximum allowable tailwind speed for helicopter landings?

The maximum allowable tailwind speed for helicopter landings is considered to be 0-5 knots. This range is crucial for several reasons.

When landing a helicopter, controlling its speed and maintaining stability during the approach are vital factors. Tailwinds can adversely affect these elements by increasing the ground speed of the helicopter without increasing its lift, which can lead to a longer landing distance and difficulties in controlling the touchdown. A tailwind of more than 5 knots may compromise the pilot's ability to manage the landing safely, as it can push the helicopter faster than desired through the landing phase.

In practical terms, keeping the tailwind at or below 5 knots allows for a safer approach and landing, thereby reducing the risk of accidents or incidents. This adherence to a conservative tailwind limit helps ensure that pilots can maintain optimal control of the helicopter during one of the most critical phases of flight.