Final answer:
The directional control lever of a bomb-lift truck should be in neutral during loading or unloading to prevent accidental movement and ensure safety.
Step-by-step explanation:
When loading or unloading with a bomb-lift truck, the directional control lever should be in the neutral position. This is essential for safety reasons, as it prevents any accidental movement of the vehicle that could lead to injury or damage to the payload or equipment. Keeping the lever in neutral ensures that the hydraulic and mechanical systems that control the movement of the truck are not engaged, which is critical during the delicate process of handling explosives or heavy payloads.