What condition can lead to aircraft tip back during towing?

An aircraft can tip back during towing primarily when its center of gravity is located aft of a specific point, such as FS 450. The center of gravity's position relative to the aircraft's structural design and towing dynamics is critical. When the center of gravity shifts too far back, it alters the balance and stability of the aircraft while being towed. If too much weight is distributed toward the tail, it can create a leverage effect that makes the nose of the aircraft lift upwards, potentially causing it to tip back.

This is particularly significant during towing operations, where control and precision are crucial to prevent accidents or damage. Understanding the importance of maintaining the center of gravity within the safe operational limits is essential for ensuring safe towing practices. Other options do not pose the same inherent risk of tipping due to the physics of weight distribution and aircraft balance.