Vehicles or ground equipment stopped on active aircraft positions must be attended at all times. This means they must be attended:

• A. at all times
• B. only during daylight
• C. only when the vehicle is in use
• D. they may be unattended if parked

Answer: (A)

When equipment is on or near active aircraft positions, it must be attended at all times, meaning a person stays with or immediately near the gear whenever it’s stationary. The safety reason is that aircraft operations are dynamic and hazards can appear suddenly: engines or pumps can be started, aircraft can move for pushback or taxi, and jet blast or prop wash can push objects or injure nearby personnel. An attendant can spot a developing danger, move the equipment out of the way, apply or confirm brakes, and ensure chocks stay in place. This constant supervision minimizes the risk of runaway equipment, collisions, or other incidents around aircraft.

The other ideas don’t fit because hazards exist regardless of daylight or whether the vehicle is actively in use, and unattended equipment near aircraft is a serious safety risk.