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Ground power unit that needs towing. A ground power unit (GPU) is a vehicle capable of supplying power to aircraft parked on the ground. [2] Ground power units may also be built into the jetway, making it even easier to supply electrical power to aircraft.
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However, in transmitting antennas the ground system carries the full output current of the transmitter, so the resistance of an inadequate ground contact can be a major loss of transmitter power. Medium to high power transmitters usually have an extensive ground system consisting of bare copper cables buried in the earth under the antenna, to ...
The first German jet engines built during the Second World War used a mechanical APU starting system designed by the German engineer Norbert Riedel.It consisted of a 10 horsepower (7.5 kW) two-stroke flat engine, which for the Junkers Jumo 004 design was hidden in the engine nose cone, essentially functioning as a pioneering example of an auxiliary power unit for starting a jet engine.
Ground Power Unit: Aerospace Ground Equipment GPWS ground proximity warning system: Avionics G/S glideslope: Avionics GS groundspeed: GSE ground support equipment: Aerospace ground equipment GSPT Gross shop processing time GSPU Glider snatch pick-up: GUMPS: Gas, Undercarriage, Mixture, Propeller, Seat belts/Switches Mental checklist before landing
A number of ground-level power supply systems were developed from the 1970s through the 1990s, [8] but were not reliable or safe enough for commercial use. [9] The first ground-level power supply system developed to modern safety standards was the Ansaldo Stream, [7] although a competing system, Alstom APS, was the first to be commercially ...
A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) [a] is an electrical safety device, more specifically a form of Earth-leakage circuit breaker, that interrupts an electrical circuit when the current passing through line and neutral conductors of a circuit is not equal (the term residual relating to the imbalance), therefore ...
The compressed air can be supplied from an on-board auxiliary power unit (APU), a portable gas generator used by ground crew or by cross feeding bleed air from a running engine in the case of multi-engined aircraft. [19] The Turbomeca Palouste gas generator was used to start the Spey engines of the Blackburn Buccaneer.