
You either wait for it to run out of fuel or swamp it with foam.
( , Mon 9 Jul 2012, 14:55, Reply)

has a big red button you can thump. Not really practical on aircraft though :/
( , Mon 9 Jul 2012, 14:58, Reply)

Most aircraft though will have at least two methods to shut down the engines, the normal engine master switches and some bloody great red fire handles. Usually those fire handles are either mechanically connected to fuel valves, or wired in such a manner that a break in electrical continuity closes the valves.
This doesn't always work though, see the Qantas A380 incident at Changi for example...
( , Mon 9 Jul 2012, 16:56, Reply)

How about sticking a potato up its exhaust?
( , Mon 9 Jul 2012, 15:52, Reply)