Boeing 777 GE90 Engine Start

 

 

Boeing 777 GE90 Engine Start

Tube. Duration : 2.02 Mins.

Boeing 777 GE90 Engine Start

 
Starting both engines on a Boeing 777-200 fitted with General Electric GE90-85B engines. Quick Explanation The engines are started using compressed air. At the engine there is a Turbine Starter. That's in basic terms a fan on a shaft. The air blows the starter fan around which, through a gearbox and shafts, makes the engine blades turn. When the starter has sped up the engine to a certain point, fuel is added and ignited and the engine starts. More in depth explanation Where does the air come from? The compressed air comes from the Auxillary Power Unit, aka the APU. The APU is a small gas turbine engine that is located in the tail of the aircraft. Instead of producing thrust, the APU drives an Electrical Generator and an air compressor called a Load Compressor. The compressed air travels along a tube, or duct, to both engines and the air conditioning packs. The APU is quite small and is started using an electric motor powered by it's own battery. The generator on the APU is suffecient to supply all the main aircraft systems with electrical power. The compressed air can be also used to operate the air conditioning packs. How does the starter work? At the engines there is the Turbine Starter. It is essentially a turbine on a shaft. The compressed air passing over the turbine makes it turn. It is connected to the Engine Accessory Gearbox. The starter has it's own reduction gearbox, meaning that the starter turbine spins many times faster than the starter output shaft, which ...
Boeing 777 GE90 Engine Start

Boeing 777 GE90 Engine Start