Why must particular attention be given to dissimilar metal joints in avionic equipment?

Particular attention must be given to dissimilar metal joints in avionic equipment primarily because they can create corrosion issues. When two different metals come into contact, particularly in the presence of moisture or an electrolyte, galvanic corrosion can occur. This process happens because each metal has a different electrochemical potential, leading to one metal corroding faster than the other. In avionics, where reliability and safety are paramount, the integrity of connections and joints is critical. Corrosion at these junctions can lead to failures in electrical connections, which might compromise the functionality of critical avionic systems. Thus, monitoring and maintaining dissimilar metal joints is essential to prevent such corrosion-related problems and ensure the longevity and reliability of avionics.