Pmk From United States of America, joined May 1999, 664 posts, RR: 2 Posted (15 years 4 months 3 weeks 6 days 17 hours ago) and read 1100 times:
Okay...when an aircraft must make an emergency landing they often jettison fuel, I assume to both to reduce weight and also to reduce the risk of fire. Let me ask, there are airports when an A/C cannot go to a lake or desert to dump fuel. Let me ask another question; am I going to open my front door to get my newspaper and get a free Jet-A shower compliments of Delta or United?
AC_A340 From Canada, joined Sep 1999, 2251 posts, RR: 1
Reply 1, posted (15 years 4 months 3 weeks 6 days 17 hours ago) and read 1042 times:
When planes dump fuel, they are normally high in the air. The try to fly over a "vacant" area of land. If this is not possible, they dump it where they are. 99% of the fuel evaporates before it even hits the ground. The other slim amount that doesn't would be a very fine mist, almost unoticeable.
American 767 From United States of America, joined May 1999, 4093 posts, RR: 12
Reply 3, posted (15 years 4 months 3 weeks 6 days 16 hours ago) and read 1038 times:
AIRLINERS.NET CREW FORUM MODERATOR
AC-A340 has explained it very well. Fuel evaporates before reaching sea level. The only think is, if the aircraft has an engine failure just after take off, the fuel being dumped isn't that hign of course, but it is dumped far away from a populated area.
Airbus Boy From , joined Dec 1969, posts, RR:
Reply 5, posted (15 years 4 months 3 weeks 6 days 13 hours ago) and read 1013 times:
There is a FAR regarding fropping things out of you aircraft. It says you have to take precautions when you do that.
Then there is a FAR that says when you have an emergancy you can disregard the FAR to take care of your problem. This includes dropping luggage, food and fuel. And things like ATC.
It can take a while to get your fuel down to limit. In a 757 it can vent about 1 ton per minute. Think if it took off and needed to return it can take 15-20 minutes to get rid of the fuel. If it is really bad they can land over weight but no one knows what the brakes and wheels will be like. But if every one is OK who cares!!! And with the fire they can foam the runway which will prevent that. But the only thing I can think of is a gear failure and you have all the time in the world to deal with that problem.