Where does electricity come from.....

[smegballs]

on an aircraft?

Obviously passenger jets need electricity, where does it come from? Alternators on the jet engines themselves? Stand-alone electrical generator system? Do they have batteries in for emergency control in case of power failure?

Random thought I had earlier this evening.

[pinkyfloyd]

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Teflon-Mike:I think I agree with just about all Pinky has said.

[Snorty]

Well don't forget they have to get those engines started too - I have also wondered this - how big would the battery be?
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[andyscooter]

Same as a car or bike im guessing
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[Bendy]

Depends on the size of the aircraft.

Little ones are just a boggo alternator / battery setup. Lose the engine, your electrics will keep working as long as the battery does.

An airliner has a generator on each engine, an auxiliary power unit, and needs ground power when the engines aren't running. Multiple redundancy (and a hell of a lot of electrical demands)

[angryjonny]

Seen those exhaust pipes that stick out the back of airliners, under the tail? That's for the generator that runs when the plane is on the ground.

[Frost]

The Boeing 787's are currently grounded due to a series of battery fires. So it's a pretty safe bet that something was charging them during flight.

[JonB]

Sounds like Boeing borrowed Red Bull F1's KERS technology when designing their planes.
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[miles]

a 063 battery

[Raffles]

[EazyDuz]

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[angryjonny]

[Rowey]

A/C have generators that are power through an accessory gear box on each engine. One of these can often provide enough power for flight. However if one generator fails, or an engine for that matter, logic will shed power to unessential systems such as in-flight entertainment, toilets, galleys and lighting so hydraulics and flight computers get enough juice.

If you loose both engines, in almost every passenger airline there will be an Auxiliary Power Unit (APU) that is a small jet engine (often helicopter engines) that provides no thrust. They sit in the tail of the aircraft. It'll run an electrical generator enough to power the whole aircraft, and provide Pneumatics that can pressurise the aircraft and run hydraulic pumps.

If that wont start or is inop there are back up batteries that can run essential only systems for up to 30mins.

In the a worst case scenario some air craft have a RAT. Ram Air turbines are little propellers that drop from the underneath of the aircraft. They're attached to hydraulics pumps (or sometimes electrical generators) which can power flights controls and run a hydraulics electrical generator.

When the shit has truly hit the fan, some aircraft have cable operated limited flying controls, free falling landing gear and emergency brakes.

Guess what my job is...
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[drzsta]

[Rowey]

[cimbian]

And there was me thinking they got their electricity from flying through clouds like lightning does!
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[angryjonny]

[Rowey]

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[Rowey]

[angryjonny]

[Walloper]

[Teflon-Mike]

[Walloper]

[Teflon-Mike]