What operational procedure applies to Engine Running Onload/Offload?

The operational procedure that applies to Engine Running Onload/Offload is that it is used "when applicable." This means that the activity is not mandated in every situation, but rather depends on specific conditions or circumstances.

For instance, there may be instances where onloading or offloading an engine while it is running is beneficial, such as when time constraints are a factor or when it's necessary due to operational demands. Therefore, personnel must assess each situation to determine if running the engine during these procedures is necessary and safe.

The answer aligns with operational flexibility, allowing for efficient cargo handling while considering safety protocols and the nature of the mission. In contrast, the other options imply absolute rules or time constraints that do not accurately reflect the situational requirements for this procedure.