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Others, like the Dreamliner, which I fly, have a more simple system of a main tank in each wing and a center tank in the belly. Delta Air Lines Flight 89 is an example of fuel dumping that violated established regulations: on 14 Januaryit dumped more than 10, gallons of fuel at a low altitude over a populated area in Los Angelescausing do jet planes dump fuel you to 56 people including school children below. Parents, usually. If that number still holds up today, we're looking at almost two million gallons dumped in by U. So I mentioned evaporation above as one of the requirements for altitude, and that brings us to the meat of the answer.

The increased altitude would have given pilots more time to deal with the issue, and assess their options in the circumstances. There are also some situations in which pilots have elected not to dump fuel, despite this being an option.

In this instance, the aircraft suffered an engine fire shortly after takeoff. This would normally result in the flight returning to the airport, having dumped enough fuel to land at a safe weight. However, as a Boeing can safely fly on three engines, the pilots elected to continue their journey. The flight ultimately made it safely to the UK, although it landed in Manchester rather than London as a precaution, due to crew concerns about running out of fuel.

There are also some aircraft on which dumping fuel is not an option in the first place. As such, there would be no need for the aircraft to lose weight before returning to an airport after takeoff in an emergency. This is why the aircraft is not equipped with the means to dump fuel. Have you ever been on a flight where an aircraft has needed to dump fuel?

If so, what was the reason for this? Let us know your thoughts and experiences in the comments. Journalist - A recent graduate in German, Jake has a passion for air travel on a student-friendly budget that extends beyond the realms of the usual suspects of low-cost-carriers. A keen amateur photographer, he is also currently one flight away from reaching his th sector flown as a passenger.

Based in Oxfordshire, UK. Be in the know. Jake Hardiman Journalist - A recent graduate in German, Jake has a passion for air travel on a student-friendly budget that extends beyond the realms of the usual suspects of low-cost-carriers. Daily Aviation News Email Sign up to our daily aviation news digest.

I want to subscribe to Simple Flying's daily email newsletter. Simple Flying won't sell your email, see our privacy policy here. When she started slipping in and out of consciousness, the pilot knew there was only one thing to do to save her: dump more than 65, pounds of fuel into the sky.

Anthony Brickhouse: Fuel dumping, simply explained, is an aircraft losing weight before it lands. And what he's talking about is officially called a fuel jettison.

Planes are designed to land below certain weights. A heavier plane is more likely to hit the ground hard and get damaged. It's got 5, gallons of fuel, which is about three elephants weighing it down. So, landing with a full tank is pretty risky. But most flights aren't landing with a full tank. They might not be taking off with a full tank either. Before takeoff, the flight planner calculates the amount of fuel needed to complete the trip.

So that enough fuel gets burned off over the course of the flight and the plane's weight comes down and then it's safe to land. A pilot will choose to dump fuel only on very rare occasions. Brickhouse: Unless you have a medical emergency on board, someone is dying, you don't really have time to fly around and burn fuel. So, in that case that's when you would dump fuel so that you can lose weight quickly. Narrator: If the pilot has a little more time or doesn't have the capacity to dump fuel like in a lot of smaller crafts, they might dirty up the plane, this means purposefully creating drag and flying around in circles in order to burn off the excess fuel.

But if a passenger is critical, like the woman from , they might not have time for that. Fuel jettisoning systems can dump thousands of pounds a second. Most can get a plane back down to its max landing weight in 15 minutes or less, and it's usually as easy as flipping a switch in the cockpit. Most systems are a series of pumps and valves that divert the fuel to the tips of the wings.

The fuel streams behind the plane in what looks like contrails and yes, there is a fail-safe in place to stop the pilot from expelling all the fuel at once. But it's not just a pilot's judgment that decides when and how fuel gets dumped. The Federal Aviation Administration has a handful of regulations in place: the plane has to be at least 2, feet above the highest obstacle along the route, at least five miles from any other aircraft and away from populated areas and bodies of water whenever possible.

But aside from this page of FAA policy, that's about it when it comes to regulations. Dumping fuel into the atmosphere isn't free of consequences, but the Environmental Protection Agency just isn't worried about it.

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