777 Engine Fire At Takeoff

[Guest Glenn]

This is an interesting photo of a very rare event in today's world. The photographer was very lucky to catch this because the fire in the engine inlet resides there for only about a 1/20th of a second for each surge cycle. This is more than an engine fire as the title implies. This is typical of a low pressure compressor surge (backfire) where there are 1 to 3 successive "cannon shots" of fire balls spaced about 3/4 a second apart. This means the engine is operating in excess of 160,000 Horsepower and 1/40th of a second later all the Mach .70+ airflow reverses direction from inside the engine. It projects a fireball from the power generating core combustor of the engine out the front of the engine (surge phase). That fire ball is driven back into the engine (the point of this photo at about 1/3 of a second into the event cycle) by the forward speed of the aircraft and the residual inertia of the rotating fan. The airflow tries to re-establish normal direction in the engine at this point due to the rotating inertia of the engine rotors (recovery phase). Pratt & Rolls (this is a Rolls) engines may recover and operate at a reduced power level at this point.

 

But...

 

If the engine has been damaged too much (e.g. broken blades & parts particularly light built GE engines), the airflow will not resume a normal path and the engine disintegrates. If the engine is only partially damaged, it will give you 1 or 2 more cannon shots 3/4 seconds apart before the engine completely disintegrates. Either path the engine takes, that is the almost complete loss of a $12M engine and a guaranteed sweeping job for the runway. The occupants seated next to the failed engine will be temporarily deaf in one ear and all the other cabin occupants will complain of ringing ears. The pilot will think the controls have "whip sawed" him as the forces of the airplane are redistributed and then he forces them back to where they should be. Looking from behind or in front of the airplane, it will appear to "swerve" to the airplane's left, dip the nose down and then slowly lumber into the air at a shallow angle on the remaining engine. With all of the messed up airflow paths, the ECS system will receive a big slug of raw fuel, partially burnt fuel & parts from the bleed system. The cabin will fill with a haze from the contaminated hot bleed air.

 

Typical causes of this event are ingestion of a very large bird or object, thrown fan blade, bad engine control commands from the computer, a poorly maintained engine or an engine that has simply worn out.

 

Been there. Done that. Don't ever wanna do it again!

 

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FAKE!

 

A blazing engine fire may be one of the most frightening sights one could experience on board an airliner, but the — despite the elaborate explanation accompanying the picture above — scariest thing about this photograph is what a poor job someone did of editing it. (One of the major tell-tale defects in this altered picture is that the flames from the putative engine fire aren't reflected in the shiny undersurface of the plane's fuselage, even though the engine's reflection is visible just below the red and white stripes under the "American" logo.) If there were any doubts about the falsity of this photograph, the existence of the unaltered image put them to rest:

 

[smilie=nice_day.gif]

 

 

[Guest Flying Red Fox]

Lol i thought it was a fake.

 

 

[Guest g_i_jack029]

Interesting, now i know how to make good fakes....thanks glenn :D lol NAH, don't get the satisfaction if you do that [-X