GB/T 35856 - 2018 stipulates the test methods for the insulation resistance and voltage resistance of aircraft electrical equipment. The standard specifies the scope of application and covers all kinds of aircraft electrical equipment. Detailed description of the type of meter used in the insulation resistance test, test voltage and operation steps to accurately measure the insulation resistance value. For the voltage resistance test, the test equipment, boost rate, test duration and other parameters are specified to detect the insulation performance of the equipment under high voltage. Through these standard test methods, the insulation safety of aircraft electrical equipment can be guaranteed, providing a reliable basis for mass testing of electrical equipment in the aviation field, and ensuring flight safety.