What is the maximum wind speed for initial tie down on an aircraft?

The correct choice indicates that for wind speeds up to 45 knots, the appropriate number of tie-down chains is six. This is grounded in safety protocols when securing aircraft in potentially severe wind conditions. Implementing six tie-downs at this wind speed helps to ensure that the aircraft remains stable and secure, minimizing the risk of movement or damage from gusting winds.

Different wind speed thresholds require specific tie-down configurations to respond effectively to varying environmental conditions. The choice of six tie-downs at 45 knots reflects established practices that account for the additional forces that can act on an aircraft during winds of this magnitude, thus enhancing safety measures and aircraft protection.

The other options propose either fewer or more tie-downs than necessary for the given wind speeds, which could compromise safety or be unnecessarily excessive, demonstrating the critical nature of matching tie-down requirements to actual wind conditions.