Can Thrust Reversers Be Deployed in Flight?

They tend to make extremely steep descents more often (called a tactical descent/approach), so thrust reversers can be used in flight. I did some testing with the stock 747-400 in X-Plane. Deploying the thrust reverser only changes the force applied by the engine, but doesn't seem to affect the air flow.

What prevents thrust reverser deployment in flight?

There are three types of safety sensors and switches that can be installed to monitor the position of the thrust reverser and prevent a mid-flight deployment. These are limit switches, proximity sensors, and proximity switches.

How are thrust reversers deployed?

During thrust reverser activation, a sleeve mounted around the perimeter of the aircraft engine nacelle moves aft to expose cascade vanes which act to redirect the engine fan flow. This thrust reverser system can be heavy and difficult to integrate into nacelles housing large engines.