What safety practice should you follow before performing electrical maintenance on an aircraft?

What safety practice should you follow before performing electrical maintenance on an aircraft?

• A. Wear gloves
• B. Schedule a break
• C. Lockout/Tagout, de-energize circuits, and verify power removed
• D. Not necessary if circuit looks safe

Answer: (C)

Before doing electrical maintenance on an aircraft, you must ensure the system is isolated from all energy sources and cannot be energized accidentally. This involves Lockout/Tagout, de-energizing the circuits, and verifying that power has actually been removed. Lockout devices physically prevent re-energizing, while tags communicate that a maintenance person is working and that the equipment should not be powered. Verifying power removed means testing the circuit with proper equipment to confirm there is no voltage and checking for stored energy in capacitors or other energy storage. This is crucial on aircraft where multiple power sources—like external power, batteries, and generators—can feed into circuits in different ways. Wearing gloves or taking a break does not guarantee the circuit is safe, and assuming a circuit is safe because it “looks fine” is unsafe.

Before doing electrical maintenance on an aircraft, you must ensure the system is isolated from all energy sources and cannot be energized accidentally. This involves Lockout/Tagout, de-energizing the circuits, and verifying that power has actually been removed. Lockout devices physically prevent re-energizing, while tags communicate that a maintenance person is working and that the equipment should not be powered. Verifying power removed means testing the circuit with proper equipment to confirm there is no voltage and checking for stored energy in capacitors or other energy storage. This is crucial on aircraft where multiple power sources—like external power, batteries, and generators—can feed into circuits in different ways. Wearing gloves or taking a break does not guarantee the circuit is safe, and assuming a circuit is safe because it “looks fine” is unsafe.