Which measure directly reduces the risk of aircraft movement during landing gear service?

• A. Wheel chocks
• B. Lockout/tagout procedures
• C. De-energize hydraulics
• D. Wear PPE

Answer: (A)

Blocking wheel movement with chocks directly prevents the aircraft from rolling while you service the landing gear. Wheel chocks are a physical restraint placed against the tires, so even if there’s a shift in weight, a gradient, or a momentary hydraulic actuation, the wheel cannot roll. This direct, mechanical barrier is why wheel chocks are the primary safety measure in this scenario.

Lockout/tagout is about isolating energy sources to prevent inadvertent startup of systems, which is important for equipment work but does not actively stop the aircraft from moving. De-energizing hydraulics reduces the chance of unintended hydraulic actuation, yet it doesn’t guarantee the aircraft won’t roll. PPE protects the technician from injuries but does not prevent movement of the aircraft.