List the major safety hazards involved with aircraft electrical systems during maintenance.

• A. Electric shock, arc flash, hot surfaces, high voltage potential, fuel/air-vapor ignition, static discharge, stored energy
• B. Minor scratches
• C. Loud noises only
• D. No hazards

Answer: (A)

The key idea is that aircraft electrical maintenance involves multiple energy-related hazards that can cause serious injury if not controlled. Electric shock can occur from contact with energized conductors or devices, especially when power is not fully isolated or when paths exist through the body. Arc flash poses a sudden, intense burst of energy that can burn skin and eyes and can blow apart equipment, so maintaining proper clearance, using appropriate PPE, and verifying de-energization before work is essential. Hot surfaces are common on power converters, transformers, and motors, so hot-component burns require allowing cooling time and using protective gloves or tools. High voltage potential means there can be dangerous voltage present even if equipment seems off, so workers must treat circuits as live unless properly confirmed de-energized and grounded, using insulated tools and proper barriers. Fuel/air-vapor ignition is a real risk in aircraft environments where fuel is present; a spark from a fault or hot surface can ignite vapors, so isolating and ventilating fuel systems, bonding and grounding, and avoiding ignition sources are critical. Static discharge can damage sensitive avionics and also give a shock, so use ESD-safe work practices, grounding, and anti-static handling procedures. Stored energy includes capacitors, batteries, and other energy storage devices that can release energy after power is removed, so verify zero energy and discharge stored sources through proper procedures before servicing.

Other options miss these hazards entirely, focusing on negligible risks like minor scratches or just loud noises, or claiming no hazards at all.