What is the maximum tailwind in knots allowed when issuing downwind takeoffs to helicopters?

The correct answer regarding the maximum tailwind allowed for issuing downwind takeoffs to helicopters is 5 knots. This limit is in place to ensure safety during takeoff when helicopters are proceeding downwind, as a tailwind can negatively affect the performance characteristics of the aircraft.

A tailwind exceeding this threshold could complicate the takeoff, leading to longer takeoff distances or difficulties in achieving needed climb rates. It is essential for pilots to have sufficient headwind to safely lift off and transition to forward flight effectively, especially as helicopters often require more careful handling compared to fixed-wing aircraft.

In contrast, the other options present limits that either do not comply with the established protocols for safe helicopter operations or would potentially lead to unsafe flying conditions. For example, a limit of 3 knots might be too restrictive in scenarios where environmental factors are moderate yet within operational limits, while 7 knots or 10 knots could introduce a higher risk than deemed acceptable for safe takeoff under downwind conditions.