What happens when you start an aircraft engine?

What happens when you start an aircraft engine?

Fuel starts flowing and an igniter similar to a spark plug ignites the fuel. Then fuel flow is increased to spin the engine up to its operating speed. If you have ever been at the airport and watched a big jet engine start up, you know that the blades start rotating slowly. The electric starter motor does that.

Is a key required to start aircraft engines?

Because there are so many ways to start an airplane engine, there is no need for ignition keys for most large jet airplanes, which means the smaller planes are now the only ones using a key to start and fly the plane.

Can Jetwash cause flameout?

As a matter of fact, the F-14A NATOPS manual specifically mentions jet wash as a contributory factor in engine compressor stalls and flameout. When the other engine flamed out, the aircraft’s hydraulic systems would drop off line and render the flight controls inoperative.

Why do 777 engines explode?

US officials say two fan blades on the Boeing 777’s Pratt & Whitney engine broke off. Experts say it’s likely one blade snapped first and chopped off the second. US National Transportation Safety Board (NTSB) chairman Robert Sumwalt says a preliminary assessment suggests one of the fan blades had a metal fatigue crack.

Do airplanes use keys?

Small planes (like the little Cessna in How Airplanes Work) have locks on the doors and ignition keys inside to start the engine. Commercial jets, on the other hand, have no locks on the doors and no ignition key of any sort. You can hop in, flip a couple of switches and start one up!

Can a jet engine backfire?

Although aircraft with piston engines can backfire, due to their design, jet engines do not backfire. Backfires are explosions that occur in the air intake or exhaust systems of cars as a result of the ignition of unburnt fuel in their exhaust systems.

What kind of engine was used to start an airplane?

Early piston engines were started by hand, with geared hand starting, electrical and cartridge-operated systems for larger engines being developed between the wars.

What causes an aircraft engine to start unexpectedly?

“Turning the engine” with the ignition and switches accidentally left “on” can also cause injury, as the engine can start unexpectedly when a spark plug fires. If the switch is not in start position, the spark will occur before the piston hits top dead center, which can force the propeller to violently kick back.

Where does the compressed air come from to start an engine?

The compressed air can be supplied from an on-board auxiliary power unit (APU), a portable gas generator used by ground crew or by cross feeding bleed air from a running engine in the case of multi-engined aircraft. The Turbomeca Palouste gas generator was used to start the Spey engines of the Blackburn Buccaneer.

How does an aircraft engine start in cold weather?

Powered by an onboard battery, ground electrical supply or both, the starter is operated by a key or switch in the cockpit. The key system usually facilitates switching of the magnetos. In cold ambient conditions the friction caused by viscous engine oil causes a high load on the starting system.