In 2013, the airworthiness authorities of US and Europe announced to allow passengers to use portable electronic devices (PED) including cell phones in flight mode, tablets, laptops and etc during all flight phases. The airworthiness requirements relevant to PED usage tends to be mature over more than 50 years. The aircraft manufacture is required to demonstrate the aircraft compliance to PED front door and back door coupling to the airworthiness authorities so as to prove the aircraft airworthiness in the circumstances of PED radiation.