0
A Boeing 747 has an auxiliary power unit (APU) with a gas turbine driving two electric generators delivering around 90 kVA each and an air compressor. This is used mostly on the ground to prepare the plane and start the engines.
Usually the air conditioning packs are stopped before launching the engines (or only one out of the four remains active, etc.) to save all power for the engine startup procedure, because the engines are started using the compressed air provided by the APU. Also the electrical power provided by the APU is saved for the startup procedure.
Packs are reconnected after the engines have winded up. The engines produce their own energy using 4 integrated drive generators (IDG) delivering 90 kVA each. When they are started the APU can be shut down (or left running thru the flight).
As these systems are highly redundant, we may think the actual power need is about 200 kVA. In case of urgency many utilities can be stopped, like the air conditioning packs.
Electrical current is provided by the APU and IDG at 115 V and 400 Hz AC (to save weight on electrical equipment).
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
How much fuel does an airplane need?
they need a lot alot of fuel1
Why do you need so much electricity?
We need so much electricity becauseMost of our things are powered by itLots of people NEED itWe can't do without it!!!!!!
What is the effect of static electricity in airplane?
It makes it land effectively.
How much electricity Tamil nadu need?
12,500mw
How much electricity does a train need everyday?
Trains don't use electricity it uses coal trams use however electricity.
Why is a remote airplane an electric toy?
It's a toy that requires electricity.
How much do the wings of an airplane weigh?
Airplane? What airplane? My paper airplane wings weigh less than 8 grams.
Which flies paper airplane or foil airplane?
Paper, because it is much lighter, and a foil airplane will take up much more mass.
What is Benjamin Franklin use to discover electricity?
Benjamin Franklin did not discover electricity. He performed many experiments with electricity, but saying that he "discovered" it is like saying that Charles Lindbergh discovered the airplane. Bad analogy. An airplane is man-made. Electricity is a natural phenomenon which, like the magnetic field or atomic structure, can be discovered. For a man-made object on the other hand, the proper verb would be "invent" - Lindberg of course did not invent the airplane but someone did. No one "invented" electricity, but the phenomenon was unrecognized until someone, or a series of persons, discovered its existence.
How much lift does an airplane need to fly?
It depends on the mass of the plane. The heavier the plane, the more lift it needs.
How many people do you need to build an airplane?
A single person can build an airplane.
How much electricity used by a seed dryer?
A voltage and amperage need to be stated to answer this question.
