Abstract:The Installed Physical Secondary Barrier is a new equipment of security of civil aviation aircraft which used for offering additional protection when the cockpit door is open during flight. In 2023,Federal Aviation Administration (FAA) issued Amendment No.25-150,No.121-389 and Advisory Circular (AC) 25.795-10 and set requirements for the airworthiness of the Installed Physical Secondary Barrier and providing recommendations for means of compliance. However, there is no content or requirements related to the Installed Physical Secondary Barrier within the existing civil aviation regulatory system in China. Based on the relevant regulations issued by the FAA, this paper interprets and analyzes the airworthiness requirements, compliance methods, specific design concepts, and post-implementation benefit-to-cost ratio of installed physical secondary barrier. It integrates relevant patents, research reports, and materials related to installed physical secondary barrier published aboard. Research has found that some requirement should be considered at the same time such as barrier can delay behavior of attack for at least 5 seconds, provide clear visibility on both sides of the barrier, people can’t touch the flight deck door by through the barrier and so on when develop the regulations of airworthiness of Installed Physical Secondary Barrier. At present, administration can only propose installation requirements to aircraft which newly delivered that are operated by airlines under Part 121 because of considering the combination of whole safety and cost effectiveness.
