Why do planes burn fuel before landing?

Airplanes frequently depart the airport heavier than the maximum landing weight allowed – the threshold at which a given aircraft can sustain a very hard landing without damage. During a normal flight, the plan is to burn fuel so the plane's weight will below that number by the time it lands.



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Q: Why do planes speed up before landing? The airplanes do not increase speed before landing. But when landing gear and flaps are set to landing position, they create a lot of aerodynamic drag. Therefore, engine power is increased to maintain the approach speed.

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Military and civilian aircraft at times dis- charge fuel in flight to facilitate a safe landing.

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The maximum landing weight (MLW) is the maximum aircraft gross weight due to design or operational limitations at which an aircraft is permitted to land. The MLW is set in order to ensure safe landings; if an aircraft weighs too heavy during touchdown, it may suffer structural damage or even break apart upon landing.

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In commercial aviation fuel is dumped rarely. Only if the aircraft is taking off above max landing weight and an emergency takes place shortly after takeoff would a commercial aircraft be required to dump fuel.

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The bumps you experience during take off, landing and while clearing clouds is a caused by either of the two turbulence types. Add to that the speed of the airplane cutting through dense air at lower altitudes, and some bumps are expected as well as entirely normal.

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The Gimli Glider incident occurred 40 years ago when an Air Canada Boeing 767 ran out of fuel at 41,000 feet, but the pilots successfully glided the plane to a former airfield turned race track for a safe landing.

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Over a certain altitude it is always considered safe to dump fuel. The high speed of the airplane means the fuel is spread very thin and will evaporate before it hits the ground. Accidents do of course happen where it is not possible to safely dump fuel and they end up dumping over populated areas.

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What happens if you need to get on the ground right away? In almost every case, any commercial plane flying is technically able to land even at close to its maximum takeoff weight.

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The simple answer is NO. Both the pilots have to be attentive even while the aircraft is cruising on autopilot. If a pilot sleeps in the cockpit and is cought by the authorities he can be fired or maybe suspended for a few days.

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Usually not. However, some weather conditions can cause turbulence and up and downdrafts such that an airplane can not be controlled completely; that makes me nervous. The pilot can usually keep the pitch about right, but the airspeed will be going all over the place.

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Aircraft Instruments that Help the Pilots See in Cloud The pilots also have a weather radar which can be viewed on their screens and this can help them determine what type of cloud it is they are flying through (or approaching), how much water there is in the cloud, and if there are more clouds behind it.

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Severe turbulence can cause a plane to drop so suddenly that pilots temporarily lose control. But, again, that's not enough to crash the plane. That's not to say it's never happened. In 1966, human error and turbulence combined to bring a plane down over Mount Fuji.

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Turbulence, which causes planes to suddenly jolt while in flight, is considered a fairly normal occurrence and nothing to fear. The movement is caused by atmospheric pressure, jet streams, air around mountains, cold or warm weather fronts, or thunderstorms, according to The Federal Aviation Administration.

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The disruption in the air current which helps a plane to fly results in shakes and it is referred to as turbulence. Also known as air pockets, turbulence can cause a sudden loss of altitude temporarily.

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Since most twin jet airliners can meet these requirements, most aircraft of this type such as the Boeing 737 (all models), the DC-9/MD80/Boeing 717, the A320 family and various regional jet (RJ) aircraft do not have fuel dump systems installed.

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