Investigation into Provisions and Validation for Cockpit Smoke Evacuation on Civil Aircraft

In case of smoke occurrence in the cockpit on civil aircraft, whether the cockpit can readily evacuate smoke directly influence safety of the pilots and passengers. The airworthiness regulation CCAR25.831 (d) puts forward requirements for cockpit smoke evacuation. However, the provision does not provide explicit indexes or instructions and cannot be directly used for aircraft design or validation. This paper mainly investigates CCAR25.831 (d) and related advisory circular, based on which the validation method is proposed in detail and put into practice. Through theoretical research and flight test, it provides ideas and methods for design and airworthiness validation for cockpit smoke evacuation on civil aircraft.