List safety steps to take before performing electrical troubleshooting on an aircraft.

• A. De-energize power, apply lockout/tagout, discharge capacitors, wear PPE, and verify with a known-good power source.
• B. Power up and observe system response.
• C. Wear PPE only.
• D. Ignore lockout/tagout and proceed.

Answer: (D)

Before touching aircraft electrical systems, you must ensure all energy is removed and the circuit is isolated. The safest approach is to de-energize the power, apply lockout/tagout so no one can re-energize it while you work, discharge capacitors and other energy-storing components to eliminate stored energy, wear appropriate PPE, and verify the circuit is safe with proper testing to confirm there is no voltage present. This sequence protects you from electric shock, arc flash, and unexpected re-energization during troubleshooting. Pushing power back on to see what happens is dangerous, PPE alone doesn’t eliminate live energy, and skipping lockout/tagout creates a real risk of someone re-energizing the system mid-task.