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Dumping Fuel - But Where Does It Go?  
User currently offlineLordHowe From Finland, joined Jan 2003, 728 posts, RR: 1
Posted (9 years 11 months 1 week 8 hours ago) and read 4030 times:

I'm sure somebody has asked this same question here before - but I'll ask it anyway: I was just looking at a photo here on A.net of a CX A340-600 dumping fuel because of an unexpected landing.


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What happens to the fuel when they dump it. Does it disappear in the air or does it come down?

Regards,
LordHowe


Lord Howe Island - The Last Paradise
3 replies: All unread, jump to last
 
User currently offlineStudentFlyer From Australia, joined Sep 2004, 688 posts, RR: 3
Reply 1, posted (9 years 11 months 1 week 8 hours ago) and read 4012 times:

My assumption would be: It will simply evaporate to thin air, as with automobile fuel and alcohol. I'm not a chemistry expert, I hope someone else can expand this and give a further explanation  Smile

Regards,
AK


User currently offlineKingGeo3 From United States of America, joined Oct 2003, 164 posts, RR: 0
Reply 2, posted (9 years 11 months 1 week 7 hours ago) and read 3969 times:

Most of the fuel would evaporate before it hit the ground because of the fine dispersion of the droplets. Most of the evaporated fuel would not condense, but be broken down by various chemical reactions in the upper atmosphere.

-KG3



Nobody respects me . . . :(
User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 3, posted (9 years 11 months 1 week 2 hours ago) and read 3406 times:

If dumping occurs at the usual altitudes it's supposed to, it dissipates, but that's not necessarily the case down low. AA had a widebody takeoff a few years ago from DFW (heading north) and had a problem that necessitated an immediate return. They started dumping on the climbout, and some suburbs to the N-NW (Lewisville and Flower Mound) had neighborhoods where parked cars and other surfaces had a thin coating of fuel residue on them.

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