The main business of NGL is the production of air systems and components for civil and military aircraft and includes equipment for engine bleed management, cabin air conditioning, temperature, pressure and flow control, engine starting and avionics cooling: NGL has also developed a family of Ram Air Powered self contained air cycle cold air units for cooling military aircraft pods. NGL routinely undertakes the system management role, assuming responsibility for design, performance analysis, subsequent system testing and supply of system components.