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If a given plane has four engines, they are all used and needed to carry out a normal flight. It is absolutely uncommon to shut down engines inflight.
On the ground at taxi-in or taxi-out, one or two engines can be shut down to save some fuel.
A four engined aircraft can actually fly on only two engines in some cases (though only if the other engines have failed)
What else can I help you with?
Are the planes with six engines passenger planes?
Usaly
What do you use engines for?
Engines supply energy the an engine shaft(metal cylinder) by making it turn. We used engines for almost everything... Cars, planes, fans.
Are jets planes?
Yes, jets are planes but jets are mostly known as supersonic planes.
WType of engine in aircraft?
Smaller planes have piston engines, but bigger planes like the Boeing 717-777 and other planes have turbine engines
What forms of transport use petrol?
planes, cars, motorcycle (anything that has internal combustion engines)
What are Hawker 800Xp engines used in?
Hawkers 800Xp engines are used in aircraft such as planes or hovercrafts. They do not have much use besides the aircraft. One wouldn't be able to use it much for anything else.
What makes jet planes fly?
its engines
What are four of the many search engines that use in the US?
GoogleBingYahooAsk.com
How many engines in one airplane?
You have to have at least one. (If you don't have an engine, your are classified as a glider.) The largest planes typically run 4 or 6 jet engines. Most planes have 1,2,3,4 or 6 engines. Very large aircraft sometimes have more. There are propeller planes, turbo prop and jet engines. There are also VTOL Vertical TakeOff and Landing planes, such as the Harrier and Osprey
What was made first planes or jets?
Planes powered by internal combustion engines came first.
How much fuel do planes use?
they have larger engines, therfore it takes more fuel to provide the massive power that they need.
What propels air planes?
The engines propel the airplanes.
