What practice helps prevent arcing at aircraft electrical connectors during maintenance?

• A. Replace connectors without cleaning
• B. Use insulating tape on exposed terminals
• C. Leave connectors loose
• D. Clean the connectors and apply protective coatings

Answer: (D)

Preventing arcing at electrical connectors during maintenance hinges on having clean, protected contact surfaces. Cleaning removes oxide films, dirt, and corrosion that can create unpredictable contact resistance or conductive paths, which can arc when power is connected or under vibration. After cleaning, applying an approved protective coating or anti-corrosion compound seals out moisture and contaminants and helps maintain a stable, low-resistance connection over time. Replacing connectors without cleaning leaves existing contaminants; using insulating tape on exposed terminals can trap moisture and generate insulation problems; leaving connectors loose increases resistance and the chance of arcing.