Tailpipe Fire during engine startup
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Tailpipe Fire during engine startup
I am trying to find out wich can be the maximum length of the flame of a tailpipe fire during an engine startup.
Expecially looking for info on the CFM 56, as I am flying B737...
thanks for any help on this...
F
Expecially looking for info on the CFM 56, as I am flying B737...
thanks for any help on this...
F
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ok thanks, message understood... I was thinking the same but did't have much experience on that as I had it only once...
in fact it was night (so easy to see) but the technician coudn't see it.
It was observed just by a car wich was more or less behind the A/c..
in fact it was night (so easy to see) but the technician coudn't see it.
It was observed just by a car wich was more or less behind the A/c..
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Who cares about the length of the flame, the concern should be about the length of time the flame lasts. The "hot-start" in that youtube movie seemed to last a lonnnnnnggggggg time.
I assume that was an engineering run, there doesn't appear to be any worried pax' faces peering out of the windows
I assume that was an engineering run, there doesn't appear to be any worried pax' faces peering out of the windows
Last edited by False Capture; 23rd Feb 2007 at 08:25.
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You can sometimes get a fire similar to that in the video after an engine change. Engines that have been in storage often have their fuel systems filled with preserving fluid. On the first run of the engine, this fluid will burn with a flame as it is passed out through the fuel system.
Regards, JetMech
Regards, JetMech
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Does FADEC eliminate the chance of hotstart?
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I concur - FADECs should stop it but they have been known not to, I was on a team dealing with a fix which was nicknamed the 'great balls of fire' problem, for obvious reasons. We had the fuel on/igniters on sequencing wrong, the result was described as 'disconcerting for the passengers'
VnV
VnV
You can sometimes get a fire similar to that in the video after an engine change. Engines that have been in storage often have their fuel systems filled with preserving fluid. On the first run of the engine, this fluid will burn with a flame as it is passed out through the fuel system.
Regards, JetMech
Regards, JetMech
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Check out the video and this document
http://fromtheflightdeck.com/Stories/turbofan/
Typically there has not been a concern for tailpipe fires where there is airflow through the engine. I suppose this is due to the general abscence of persons and vehicles behind an engine that has a rare tailpipe fire.
On the other hand for the even rarer case where a tailpipe fire exists with little to no airflow (standing still and the starter is disengaged) the flames will turn upward and cook the bottom of the wing. Several severe outcomes have occured
http://fromtheflightdeck.com/Stories/turbofan/
Typically there has not been a concern for tailpipe fires where there is airflow through the engine. I suppose this is due to the general abscence of persons and vehicles behind an engine that has a rare tailpipe fire.
On the other hand for the even rarer case where a tailpipe fire exists with little to no airflow (standing still and the starter is disengaged) the flames will turn upward and cook the bottom of the wing. Several severe outcomes have occured
You don't want to be taxiing too close behind an a/c with rear mounted engines starting up on a cold day.
It can be hard on the paint job -- and not the best enviroment for a fuel vent
It can be hard on the paint job -- and not the best enviroment for a fuel vent
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If the start is otherwise normal (N2 accelerating, EGT/ITT normal) then it's best to continue the start. If you abort for any reason, and re-engage the starter during coastdown, you can shear a drive shaft.