PBS AEROSPACE engineers and produces various types of Auxiliary Power Units and Environmental Control Systems according to specific customer requirements. Auxiliary power units are used in airplanes and helicopters, where they serve as a source of electrical power before the main aircraft engines begin to run. They supply electrical power to on-board networks, especially for starting the main engines or for supplying onboard devices and air conditioning units. More complex units can also partially substitute energy supply in case of an emergency, such as in the event of main engine failure, or supply on-board aggregates with power during preparation before the flight. Environmental Control Systems are designed to maintain a comfortable thermal environment in the cockpit, passenger cabin and cargo holds of aircraft and helicopters during ground operations and all flight modes. The PBS AEROSPACE production division, is a manufacturer of these applications designed especially for aircrafts and helicopters serving in in the defense and civilian industries. PBS AEROSPACE Inc. (US) is the supplier of these applications in the USA.