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The ability of aircraft wire/cables to effectively prevent fluid leakage is essential to protecting sensitive electrical components and avoiding damage by corrosion. The immersion leak detection test evaluates the effectiveness of seals and the airtightness of a wire or cable assembly.
The procedure involves the use of the Wire Insulation Degradation Analysis System (WIDAS). The standard procedure includes submersion of the test sample into a vat of heated fluid to detect any leaks indicated by the presence of bubbling. The test fluid commonly used is canola oil.