What is the recommended number of chains for a normal weather tie down at 45 knots?

For a normal weather tie-down at wind speeds of 45 knots, the correct number of chains to secure an aircraft is nine. This number is based on guidelines that take into account the need for stability and safety under significant wind conditions. Proper tie-down procedures are essential to prevent aircraft movement or damage, and the recommended number of chains reflects the strength required to withstand such winds.

Each chain provides an anchor point that secures the aircraft to the ground, and as wind speeds increase, the likelihood of the aircraft being moved or damaged also increases. Therefore, ensuring that an appropriate number of chains are used is crucial for effective tie-down practices, especially in adverse weather conditions.

While others may suggest different numbers of chains, they do not align with the established safety standards used for securing aircraft in winds of that speed. Nine chains represent a balance that is considered effective for the specified wind conditions without adding unnecessary complexity or material usage.