What safety precautions must be observed when working on aircraft electrical systems?

• A. Depower the system, follow lockout/tagout procedures, discharge capacitors, use insulated tools, avoid contact with exposed conductors, and follow manufacturer procedures.
• B. Work with the system energized and assume safety.
• C. Ignore capacitors but wear gloves.
• D. Only observe safety if inspecting at night.

Answer: (A)

Working safely on aircraft electrical systems starts with removing power and controlling energy sources. Depowering the system and following lockout/tagout procedures ensure the system cannot be energized unexpectedly. Discharging capacitors is essential because capacitors can store dangerous energy even after power is removed. Using insulated tools reduces the risk of shock or arcing, and avoiding contact with exposed conductors prevents accidental electrical contact. Always follow the manufacturer’s procedures because they provide the exact steps and precautions for the specific system you’re working on. Working with the system energized, ignoring capacitors, or delaying safety precautions for reasons like time of day are unsafe and do not meet proper electrical safety practice.