Which safety measure helps prevent the aircraft from moving during landing gear maintenance?

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

Answer: (A)

Preventing movement during landing gear maintenance relies on a solid physical restraint. Wheel chocks are wedges placed against the wheels to stop them from rolling. When positioned on the ground on both sides of the tire, they create a direct barrier to any tendency of the aircraft to move, even if hydraulic systems or brakes are released or if the gear is being jacked up. That direct, mechanical stop is why wheel chocks are the most effective safety measure for keeping the aircraft stationary during maintenance.

The other measures contribute to safety in related ways but don’t provide the same guaranteed prevention of movement. De-energizing hydraulics reduces the risk of unintended gear actuation or other hydraulic movements. Lockout/tagout procedures ensure energy sources cannot be re-energized during work, preventing accidental startup of systems. Wearing personal protective equipment protects the technician from hazards encountered during maintenance.