What is the function of an ultrasonic cleaner in avionics?

The function of an ultrasonic cleaner in avionics is to provide ultrasonic scrubbing. This cleaning method utilizes high-frequency sound waves to create microscopic bubbles in a cleaning solution. When these bubbles collapse or burst, they produce powerful shock waves that dislodge dirt, grease, and contaminants from the surfaces of components being cleaned. This is particularly effective in accessing hard-to-reach areas, such as intricate geometries or small crevices in avionics equipment.

The other choices do not accurately describe the primary function of an ultrasonic cleaner. Some might mention evaporation, chemical reactions, or drying, but these processes do not reflect the mechanical action of ultrasonic cleaning, which is specifically designed to enhance the cleaning process without the need for abrasive methods or harsh chemicals. Thus, the correct answer highlights the unique and effective scrubbing action that ultrasonic cleaners provide, crucial for maintaining the integrity and performance of avionics components.