Which step should be performed to ensure hydraulic leaks do not create hazards during maintenance?

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

Answer: (D)

Controlling hydraulic hazards during maintenance starts with making sure the system cannot be energized or release pressure while work is underway. Following lockout/tagout procedures is the best approach because it provides a formal process to identify all energy sources, isolate the hydraulic power supply, apply locks to prevent re-energizing, and tag the system to warn others. It also covers verification that energy is zero and the relief of stored or residual pressure, so no unexpected release or spray can occur during service. The other options offer useful safety aspects but don’t fully address the risk: wheel chocks prevent aircraft movement, PPE protects you but doesn’t stop a sudden leak or pressure release, and simply de-energizing hydraulics may leave stored energy or be bypassed. Lockout/tagout creates a comprehensive, enforceable safeguard for hydraulic systems during maintenance.