What must be verified during preflight checks of thrust reversers after cold soaking for over 8 hours?

During preflight checks of thrust reversers after a period of cold soaking exceeding 8 hours, it is essential to verify fan rotation. This is critical because cold temperatures can affect the operational performance of the thrust reversers. Ensuring that the fans rotate properly guarantees that the thrust reversers will function as intended when deployed, which is crucial for deceleration during landing and preventing runway overruns.

Prior to deployment, the system may require verification that it has not been adversely impacted by the cold. If fan rotation is not confirmed or is inhibited, it could lead to malfunctions when the thrust reversers are called upon to operate. Therefore, verifying fan rotation during this specific preflight check is a necessary safety precaution to ensure that the aircraft is in a fully operational state before flight.

The other checks, while important in their contexts, do not specifically address the operational readiness of thrust reversers post-cold soak in the same direct manner as confirming fan rotation.