Abstract: An advanced hybrid air and vapor cycle environmental control system (ECS) to provide conditioned, pressurized air to an aircraft as well as liquid cooling for the avionics of the aircraft.

Abstract: A flame arresting and explosion attenuating system particularly for use in fuel tanks and other similar structures which are designed to contain highly inflammable fluids. The tank or enclosure may be a single compartmented or it may be divided or partitioned into a plurality of individual fuel cells of compartments at least some of which communicate with one another through openings or apertures in the partitions which form them. The subject system is designed to prevent the propagation of flame supported by combustion of the fluid within the tank and to quench the flame when it tries to spread from one compartment to another and to attenuate the explosive forces generated due to ignition of fluid by allowing the forces thereof to be distributed over the total volume of the enclosure so that there is little or no likelihood of the explosion damaging the enclosure.