What is the limitation for using thrust reversers during landing?

The limitation for using thrust reversers during landing specifies that they must not be deployed below a certain airspeed to ensure safety and effective operation. This guideline is in place to prevent potential issues with control and stability during landing roll-out. Specifically, deploying thrust reversers too low in speed may lead to insufficient aerodynamic lift and control effectiveness, which can compromise the aircraft's handling characteristics.

In this case, the correct answer indicates that thrust reversers should not be deployed below 60 knots. This threshold ensures that the aircraft maintains adequate control authority and reduces the risk of unwanted aerodynamic effects that could arise at lower speeds.

The other options are higher airspeed limits that do not align with the operational standards set for safe and effective use of thrust reversers. Each of those alternatives may suggest more conservative approaches, but the industry standard for many aircraft types typically supports the use of thrust reversers down to 60 knots as a manageable and safe limit for efficient deceleration without compromising control.