Anonymous asked in Cars & TransportationAircraft · 8 years ago

Questions on airplanes?

1) every time when an airplane lands why does it go really fast as if it going to take off sort of? and why do the flaps or whatever you call that on the wings move downward or flap up?

2)how does a plane get from one airport to another especially internationally? do they have a system in the cockpit that has way points that the pilot follows in order to get there? if so what is that system in the cockpits called?

3) is this true that when a pilot lands a plane is there a small tv like computer that they punch in the runway they are going to land at? like a cdu display?

9 Answers

  • 8 years ago
    Favorite Answer

    The airplane is not going "really fast" it is more or less in slow flight. An Airplane has to be below a certain speed to land, but also can fly slower than it takes to take off, so in fact you are just noticing the speed of it. In comparison to normal flight it is slow, in comparison to takeoff it 'can' be slower.

    The flaps move downward, the landing flaps anyway. The speed brakes flap up to slow the momentum of the airplane more vigorously than the landing flaps. Landing flaps are also used on takeoff if a shorter runway roll is needed in the case of obstacles at the end of the runway or a shorter runway. The speed brakes are automatic and are deployed when the wheels touch down but can also be deployed manually.

    All modern international jets are equipped with a GPS, the airplane also has other equipment that can actually be programmed to fly the flight automatically, meaning takeoff (TOGA) or Takeoff/Go Around, follow flight path to destination, and can even be used to land which I will describe that process at the end.

    The runway they are going to land at has a special number assigned to it based on the degree deviation clockwise from 0 or in other words 360 degrees. It the airplane is landing south the runway would be called runway 18 or "one-eight". These numbers are reversed as in 18 is north on the airport and 36 (three-six) is south, so if the airplane is heading towards north he sees 36 if you know what I mean. If the number 36 was on the north side of the airport then when the airplane landed south he would see 36 which is north instead of 18 which is south. The opposite ends of the runway is marked differently with different degree numbers. The pilot enters these number into the computer as it will give him the best GS or glideslope (up and down) and the best localizer (Left and right).

    The landing I was telling you about using the autopilot is called an ILS or Instrument Landing System landing used in what is called IFR or Instrument Flight Rules conditions, or when viability is not possible out of the cockpit. ILS landings are categorized in three category CAT I, CAT II, and CAT III, CAT being category. A CAT III ILS approach is when you have zero visibility out of the cockpit. How this is done is the pilot of course get clearance from the tower, sometimes accompanied by directions to the airport based on needed circumstances. The pilot used the number of the runway and looks for a special frequency designated to that runway and punches it into the NAV radio and verifies he has the right runway by a numerical Morse code played from the NAV when he punches it in. At that point the pilot makes sure he is centered with the runway using the localizer, than he waits for his spot on the glideslope to center and then hits a button sometimes referred to as Auto Pilot Procedure button, when that happens the airplane takes control and starts to descend towards the runway, keeping the glideslope and localizer centered itself. When the airport passes certain markers, outer, middle, and inner, it plays certain sounds notifying the distance from the runway. When the airplane gets closer to the runway the airplane plays the "minimums" or the feet from the runway and counts down to at least 10 until the airplane touches down. The minimums are not only ILS but manual landings too.

    Reverse thrusters are when the engines actually blow air out the front for extra stopping power, just though I'd throw that in there.

    Source(s): I'm a pilot. Cool CAT III for your entertainment: ILS visible landing with minimums: Flaps Vs. Speed brakes example (Flaps used first, reverse thrusters can be heard if you listen close after touchdown):
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  • 8 years ago

    1) "when an airplane lands why does it go really fast "

    It doesn't. Your perception is wildly off, especially for turbojet powered aircraft which - at that point - are at the low end of their speed range.

    "as if it going to take off sort of"

    It would need that speed in the event it had to do a missed approach maneuver.

    "why do the flaps or whatever you call that on the wings move downward or flap up?"

    Nobody should answer that question until you specify what "whatever you call it" refers to. I presume you're talking about events occurring during landing.

    2) "how does a plane get from one airport to another especially internationally?"

    Long range navigation, per-selected routes, air traffic control, gos, etc.

    3) "is this true that when a pilot lands a plane is there a small tv like computer that they punch in the runway they are going to land at? like a cdu display?"

    Nobody should answer a question having the word "like" in it. Like, ya know...

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  • FanMan
    Lv 5
    8 years ago

    1. It doesn't go "really fast". You are probably thinking of the increase in engine noise; the pilot uses reverse thrust from the engines to help slow the plane down. The flaps move back and down to help help the plane up at low speeds, and the spoilers on top of the wings move up after touchdown to "spoil" the lift so the plane stays firmly down on the runway.

    2. There are various navigation systems on the plane. The simplest of these is... a map! Aeronautical charts show airports, geographical features the pilots can see, and other information like radio frequencies, etc. There are also electronic navigation systems like GPS, VOR, etc... google can tell you more about these.

    3. No, but there is ILS (Instrument Landing System) which guides the plane down the glide path to the runway. The pilot has to select the appropriate frequency for the runway in use.

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  • 4 years ago


    Source(s): Most Realistic Flight Simulator :
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  • 8 years ago

    1) A 737 for example, takes off at about 140 knots and lands about 115. Not much difference. The spoilers, the upward flap, goes up to 'spoil' the flow of air to slow the airplane down, with reverse thrust and brakes to help it stop.

    2) On Visual flight, the pilot will fly according to the flight plan. There may be waypoints if it is inputted in the original flight plan. ATC will sometimes vector the airplane onto a new route. On Instrument flight, ATC tells you everything, where to turn, altitude etc. They may not follow your flight plan.

    3) I'm not sure. If it is Instrument Landing System, they input a course and the ILS navigation frequency. The runway will be visible on the GPS, and as a pink line on the heading display (although that is aircraft direction comparative to runway)

    Source(s): Reading for a few months now.
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  • 4 years ago

    1) When an airplane lands, it is going very fast because it just went from the air to the ground, and is still slowing down, however the breaks, and friction of the ground help slow it down. The flaps on the wings move during the landing because they help slow down the plane.

    2) In commercial planes and many small planes, the pilots have GPS's telling them where to go. Many planes have something called a G1000, or in some cases a G500 (smaller) which costs about $25,000. It includes the GPS, and has digital instruments that tell pilots stuff like the speed, altitude, direction, etc.

    3) As described in the last question, yes. That is the G1000.

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  • 3 years ago

    Planes go fast when landing because they need enough speed goind over the wings so the wings can create enough lift to hold the weight of the plane

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  • 8 years ago

    That's a whole lot of questions rolled into one fellow Ben.I'm afraid I don't have time to teach the whole ATPL theory course in one answer.

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  • 8 years ago

    when plane going to land it is true that tires smoke

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