How does corrosion affect aircraft electrical connections, and how is it mitigated?

How does corrosion affect aircraft electrical connections, and how is it mitigated?

• A. Corrosion decreases resistance and improves connection
• B. Increases resistance and causes intermittent faults; mitigated by cleaning, replacing corroded parts, applying protective coatings
• C. Has no effect
• D. Only affects mechanical integrity, not electrical

Answer: (B)

Corrosion at electrical connections increases resistance rather than decreases it. When moisture, salts, or chemicals are present, corrosion products form on contact surfaces, reducing the effective contact area. This raises contact resistance, which can cause voltage drops, localized heating, and intermittent faults as vibration or movement breaks or alters the imperfect contact. Over time, this can lead to unreliable signals or even open circuits in critical aircraft systems. Mitigation centers on removing corrosion and preventing its return. Clean the contacts using approved methods, and replace connectors or terminals that are severely corroded. Apply protective coatings or sealants, and use anti-corrosion compounds or dielectric grease to inhibit moisture ingress. Ensure proper mating and torque, use corrosion-resistant materials, and seal assemblies to protect them from moisture and salt exposure. Regular inspection and environmental controls are also important to keep electrical connections reliable.

Corrosion at electrical connections increases resistance rather than decreases it. When moisture, salts, or chemicals are present, corrosion products form on contact surfaces, reducing the effective contact area. This raises contact resistance, which can cause voltage drops, localized heating, and intermittent faults as vibration or movement breaks or alters the imperfect contact. Over time, this can lead to unreliable signals or even open circuits in critical aircraft systems.

Mitigation centers on removing corrosion and preventing its return. Clean the contacts using approved methods, and replace connectors or terminals that are severely corroded. Apply protective coatings or sealants, and use anti-corrosion compounds or dielectric grease to inhibit moisture ingress. Ensure proper mating and torque, use corrosion-resistant materials, and seal assemblies to protect them from moisture and salt exposure. Regular inspection and environmental controls are also important to keep electrical connections reliable.