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Dumping Fuel  
User currently offlineAMSMAN From Ireland, joined Jan 2002, 1016 posts, RR: 6
Posted (11 years 1 month 2 weeks 5 days 7 hours ago) and read 3054 times:

What happens to the fuel when an a/c dumps it? does it rain down, does it evaporate?

Can somebody help?

Thanks in advance
AMS


Aer Lingus, Proud to be Irish.
18 replies: All unread, jump to last
 
User currently offlineDan2002 From United States of America, joined Dec 2002, 2055 posts, RR: 5
Reply 1, posted (11 years 1 month 2 weeks 5 days 6 hours ago) and read 3011 times:

When it comes out of the a/c it looks like a contrail. Some evaporates but most little dropplets rain down but are hardly noticed. If the a/c is high most of it doesnt even make it all the way down.

Hope this helps



A guy asks 'What's Punk?'. I kick over a trash can and its punk. He knocks over a trash can and its trendy.
User currently offlineAMSMAN From Ireland, joined Jan 2002, 1016 posts, RR: 6
Reply 2, posted (11 years 1 month 2 weeks 5 days 3 hours ago) and read 2982 times:

So the bits that do make it down, say on a person, doesnt it do any harm to that person? What type of fuel is it anyway?


Aer Lingus, Proud to be Irish.
User currently offlineDoug_Or From United States of America, joined Mar 2000, 3381 posts, RR: 3
Reply 3, posted (11 years 1 month 2 weeks 5 days 2 hours ago) and read 2962 times:

I was under the impression most fuel dumped above 5000' would evaporate.


When in doubt, one B pump off
User currently offlineToner From United States of America, joined Feb 2003, 268 posts, RR: 0
Reply 4, posted (11 years 1 month 2 weeks 5 days 2 hours ago) and read 2954 times:

It's basically kerosene, anf ib small amounts, harmless.

User currently offlineJetguy From , joined Dec 1969, posts, RR:
Reply 5, posted (11 years 1 month 2 weeks 5 days 1 hour ago) and read 2943 times:

I don't have any exact data on this, but several years ago a met a guy who had flown some of the certification test flights for Lear when they certified fuel dumping on the Lear 25. He told me that the fuel was basically atomized and evaporated within about 35 feet. He told me that they made progressively lower high-speed passes down the runway while dumping fuel and they never detected any fuel below above about 35' AGL. That's a Learjet, and the amount and flow rate of the dump would be significantly less than a larger airplane.

User currently offlineEssentialPowr From United States of America, joined Sep 2000, 1820 posts, RR: 2
Reply 6, posted (11 years 1 month 2 weeks 4 days 17 hours ago) and read 2882 times:

Water evaporates.

Fuel does the same thing, so where does it end up? Are people really that stupid, or do they just not get the concept? Does evaporation = hyperspace? How many times has this topic been covered? ANYTHING that evaporates stays in the ATMOSPHERE and will RETURN TO EARTH, most likely in a LIQUID FORM.



User currently offlineEssentialPowr From United States of America, joined Sep 2000, 1820 posts, RR: 2
Reply 7, posted (11 years 1 month 2 weeks 4 days 17 hours ago) and read 2875 times:

Better yet,

Does a phase change mean something is "gone??" One can't SEE the WATER VAPOR in the air at 85% humidity, 97F...but IT'S STill THERE. Does anyone on this forum know anything about chemistry or basic science? PLEASE do a search on this topic. It has been repeated more than the winglet question.


User currently offlineEssentialPowr From United States of America, joined Sep 2000, 1820 posts, RR: 2
Reply 8, posted (11 years 1 month 2 weeks 4 days 17 hours ago) and read 2864 times:

What do you geniuses think acid rain is?

Byproducts of the COMBUSTION of HYDROCARBONS (largely sulfur) that remain IN THE ATMOSPHERE until CONDENSATION (rain!!!).


User currently offlineEssentialPowr From United States of America, joined Sep 2000, 1820 posts, RR: 2
Reply 9, posted (11 years 1 month 2 weeks 4 days 17 hours ago) and read 2865 times:

No, Sulfur is not a hydrocarbon...

User currently offlineOlympic A-340 From United States of America, joined Apr 2000, 780 posts, RR: 10
Reply 10, posted (11 years 1 month 2 weeks 2 days 1 hour ago) and read 2693 times:

Hydrocarbon+ O2---> CO2 + H20...as you can see the byproduct is present within the water vapor in the atmosphere. It does not vanish (contrary to popular belief  Smile/happy/getting dizzy )

User currently offlineFlyingbronco05 From United States of America, joined May 2002, 3840 posts, RR: 2
Reply 11, posted (11 years 1 month 2 weeks 1 day 22 hours ago) and read 2650 times:

When it comes out of the a/c it looks like a contrail. Some evaporates but most little dropplets rain down but are hardly noticed. If the a/c is high most of it doesnt even make it all the way down.

Like this picture:


View Large View Medium
Click here for bigger photo!

Photo © Gerhard Plomitzer



and this one:


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Click here for bigger photo!

Photo © Peter D. Baumgartner



[Edited 2003-03-13 01:14:29]

and this one:


View Large View Medium
Click here for bigger photo!

Photo © Mulder



[Edited 2003-03-13 01:15:58]


Never Trust Your Fuel Gauge
User currently offlineIl75 From Argentina, joined May 2001, 262 posts, RR: 0
Reply 12, posted (11 years 1 month 2 weeks 1 day 14 hours ago) and read 2595 times:

There was a recent incident in Auckland with a SIA B744 having a severe tail strike.

Witnesses reported a fire when the plane got airborne, and SIA sources mention a fire alarm triggered by APU damage.
In any case, the aircraft landed safely. It is stated that the crew circled the airport several times (apparently they never got higher than 1000 feet) in order to dump fuel.

It sounds strange to me you will dump fuel when you supposedly have a fire in the tail cone. Any comments on this particular?

Best regards
erico


User currently offlineCx flyboy From Hong Kong, joined Dec 1999, 6535 posts, RR: 55
Reply 13, posted (11 years 1 month 2 weeks 1 day 14 hours ago) and read 2597 times:

The press reports that they did not dunp fuel, because of the fire alarm, and instead performed an overweight landing, which if performed properly is not big drama really.

User currently offlineMr.BA From Singapore, joined Sep 2000, 3423 posts, RR: 22
Reply 14, posted (11 years 1 month 2 weeks 1 day 13 hours ago) and read 2583 times:

And also you would not have dumped it over populus area and should be done at least above 5,000 feet.


Boeing747 万岁!
User currently offlineIl75 From Argentina, joined May 2001, 262 posts, RR: 0
Reply 15, posted (11 years 1 month 2 weeks 1 day 10 hours ago) and read 2565 times:

Right. Thank you for the information, guys.
erico


User currently offlineGotAirbus From Singapore, joined May 2001, 851 posts, RR: 1
Reply 16, posted (11 years 1 month 2 weeks 16 hours ago) and read 2493 times:

Il75

Witnesses reported a fire when the plane got airborne, and SIA sources mention a fire alarm triggered by APU damage.
In any case, the aircraft landed safely. It is stated that the crew circled the airport several times (apparently they never got higher than 1000 feet) in order to dump fuel.


I hope that the airport has extra shielding from the fuel being dumped by the 744...

Actually, that was my next question. Dump fuel at 1000ft and lower and it'll rain down, right?

(gotAirbus?)



(gotAIRBUS?) - (Got Commonality?) - (Have A Nice Flight!)
User currently offlineMirrodie From United States of America, joined Apr 2000, 7438 posts, RR: 62
Reply 17, posted (11 years 1 month 1 week 5 days 18 hours ago) and read 2371 times:
Support Airliners.net - become a First Class Member!

EssentialPowr et al,

thanks for the very friendly explanation.



Forum moderator 2001-2010; He's a pedantic, pontificating, pretentious bastard, a belligerent old fart, a worthless st
User currently offlineTAA_Airbus From Australia, joined Nov 1999, 726 posts, RR: 0
Reply 18, posted (11 years 1 month 4 days 13 hours ago) and read 2245 times:

EssentialPower,

It looks like you are talking to yourself there buddy. You made 3 posts in a row.

In Australia, dumping fuel is no longer standard practice. When practical, it is recommended that fuel be burned off rather than dumped.

TAA, The Friendly Way


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