What condition deactivates touchdown protection?

Touchdown protection is an important feature designed to enhance safety during landing, specifically to prevent unintentional thrust increases that could lead to unwanted situations such as a rejected landing or a second go-around. The system is activated when the aircraft is in a landing configuration and is deactivated when certain conditions are met.

The correct answer indicates that touchdown protection gets deactivated when the wheel speed exceeds 50 knots. This is because at this speed, the aircraft is safely on the ground and the risk of needing to apply thrust for a go-around is significantly reduced. The logic behind this condition is that after touchdown, if the aircraft is rolling with wheels spinning above this threshold, the systems should allow for normal thrust management, ensuring that the pilots can effectively manage their braking and control the aircraft on the ground.

In contrast to this answer, other options suggest conditions that either do not directly relate to the deactivation of touchdown protection or focus on different aspects of the aircraft's operation or safety. For instance, the notion that touchdown protection would deactivate 3 seconds after weight on wheels may not align with operational protocols, as the actual wheel speed is a more critical factor. Furthermore, suggesting that touchdown protection only operates during landing overlooks its design purpose, which primarily focuses on the dynamics