Which of the following is NOT included in a pre-operational check for a man trip?

In the context of a pre-operational check for a man trip, fuel levels are not typically relevant because man trips, which are used in mining operations to transport personnel, often operate on electric power sources. As such, their operation is not contingent on fuel levels as it would be for equipment or vehicles powered by gasoline or diesel.

In contrast, brakes are crucial for ensuring that the man trip can stop safely, battery conditions are important to check for electric-powered units to ensure they're capable of functioning without interruptions, and safety chains are vital for securing the load and enhancing overall safety during transportation. Therefore, the absence of checking fuel levels aligns with the type of operations involved with man trips.