A safety device has been developed to prevent loss of pilot vision in the event the cockpit is filled with smoke. Recently certificated by the U.S. Federal Aviation Administration for use in some air transports, the emergency vision assurance system is based on a simple principle: instead of evacuating smoke, the device positively displaces all smoke from the vision path. By peering through the inflated envelope, the pilot is able to see the primary flight instruments and outside the windshield.