Questions tagged [landing-gear]

The wheels of an airplane. Sometimes replaced by floats or skis.

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12
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4answers
3k views

What effect would there be if the brakes were locked at touchdown?

I'm imagining if you had a panicky passenger sitting in the right seat who had both feet firmly on the brakes while landing. Unless you had a crosswind and needed rudder as you touched down it's ...
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2answers
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How realistic is the plane scene in Captain America: The First Avenger?

In Captain America: The First Avenger, there's a scene in which Captain America gets into the villain's plane by holding onto the landing gear as it's taking off and waiting for it to be retracted. ...
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2answers
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What is the typical weight distribution ratio between nose gear and main gear?

On an airplane with tricycle gears, the main gear supports most of the weight and is therefore the strongest. The nose gear prevents the nose tipping down, since the center of gravity is forward of ...
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1answer
609 views

How much force can the landing gear of a Piper Arrow withstand?

I'm currently working on my CFI-A in a Piper Arrow and i was wondering if anyone knows how much force the landing gear can withstand? The reason I ask is because I have never been asked this question ...
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3answers
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Where can one buy old 737 parts? [closed]

I'm trying to build a home cockpit for the PMDG 737-800. I'm looking for some landing gear position indicator lights but I don't know where to get them from. I've tried ebay and amazon, but it ...
5
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2answers
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How can I calculate the force on the nose gear at landing?

How can I calculate the force applied on nose gear during landing as nose gear touches the runway little after the landing gear? I understand force calculations in this question but I think it applies ...
4
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2answers
986 views

Is there a formula for calculating the pivot point of an aircraft while turning on the ground?

I'm working on a program that requires a taxiing passenger aircraft (of any model) to perform a semi-accurate turn given a steering angle of the front landing gear. For this I need to calculate the ...
10
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2answers
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How can the Antonov AN 225 only have 2 nose wheels?

I was watching the video of the AN 225 unloading at Perth airport this weekend, and it suddenly occurred to me that there are about a zillion rear wheels on the aircraft, yet only 2 nose wheels? ...
14
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2answers
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Why did some aircraft use hand-crank instead of gravity for alternate gear extension?

I wondered whether the final scene in The Memphis Belle where they hurry to extend the gear by hand crank (because their electric system failed) is realistic, but according to this answer the B-17 ...
15
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2answers
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What causes an airplane to rhythmically bounce during taxiing?

Some time ago, I was on a commercial flight and while the airplane was taxiing around, there was this rhythmic bouncing. Here is a video I made of the takeoff. You can notice the bouncing at the taxi ...
16
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1answer
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Helicopters with landing skids, no wheels; How are they taken in and out of a hangar?

I'm sure many helicopters also need/use Hangars frequently. How do you take them to a hangar and take them out of it without wheels? Specially when they have to be taken indoors for some maintenance ...
49
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1answer
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What is the purpose of the extra wheel on the XB-70 main gear?

This photo of the XB-70 Valkyrie's main gear shows a small wheel between the two main wheels: Courtsey of AirPigz.com This smaller wheel doesn't touch the ground, though I can see where it might as ...
46
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2answers
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How can the landing gear fit in the small room in the engine bay on the Tupolev Tu-144?

I recently went to the museum in Sinsheim, Germany, where a Tupolev Tu-144 is on display. I noticed that the landing gear of this plane is actually way wider than the space it has available when ...
16
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2answers
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How are skis stowed on retractable gear aircraft?

This image of a LC-130 taking off from a snow runway shows that in addition to wheels on the landing gear, it's also been equipped with skis. Source: Wikimedia Commons.We're getting a lot of use out ...
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5answers
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Is the landing gear controlled by the pilot or is it automatic?

I have been watching a few aircraft landing videos in crosswind situations and I noticed that if the airliner missed the runway the landing gear would go back into the aircraft. So I'm wondering if ...
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2answers
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How do plane landing-gear tyres roll before take off? [duplicate]

How do plane tyres roll? Are they equipped with special engines like cars or are they rolling using the plane flying engines? Or can both methods be found with different constructors?
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3answers
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Can the landing gear be pulled up while the plane is on the ground?

If a pilot makes a mistake and inadvertently touches the gear up lever, will it actually activate while on the ground and make the plane drop onto its belly? I suppose that there would be some sensor ...
0
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0answers
168 views

Why does landing gear extend backwards and retract forwards? [duplicate]

As you can see in the below image the front landing gear is retracting forwards, meaning that it extends forwards. What is the reason why they are made to drop backwards instead of forwards? Image ...
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2answers
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Is it possible to change/repair an aircraft tire while in flight?

Consider the following scenario: A crew experiences a flat/burst tyre above V1. Is it possible, in some type of aircraft, to change it while in flight? This might include, but not limited to: ...
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2answers
1k views

If a tail dragger is converted to a tricycle gear airplane, what will be the effect on weight distribution?

If a tail dragger airplane is converted to one with conventional tricycle landing gears, how will this affect the balance of the airplane? It is possible to offset the effect by shifting weights ...
7
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2answers
284 views

What are some of the more common procedures when faced with a hung landing gear?

A hung landing gear is a potentially disastrous situation for a pilot flying a general aviation piston aircraft. During "shop talk" I've heard people say that the best thing to do is cycle the gear. ...
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2answers
3k views

Why burn fuel at departure airport instead of flying to destination before emergency landing due to deflated tire?

A Southwest airliner recently had an issue where a "deflated tire indicator" showed on one of the landing gear tires after takeoff from Oakland, CA. They circled nearby for 4 hours while burning off ...
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2answers
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Which compressed air and fluid are generally used by oleos?

Which compressed air and fluid are generally being used by oleo-struts?
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2answers
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Why is the Eurofighter's nose gear door shorter than the bay?

The Eurofighter Typhoon has an interesting "feature" in that the nose gear door is shorter than the nose gear bay itself by a good few inches, as shown here: Can anyone shed any light on the reason ...
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4answers
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Is it possible to control an aircraft on the runway if the nose gear collapses?

I have read and seen some articles in which, for various reasons, the aircraft's nose gear collapsed after landing during the roll out. This resulted in the aircraft going off the runway. Is it ...
40
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4answers
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Do commercial aeroplanes use ABS to brake?

I have read that the wheel brakes on an aeroplane are by for the most efficient means of stopping it. I was wondering whether in low grip situations, such as in rain or snow, an ABS (Anti-lock Braking ...
10
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2answers
2k views

Why is the gear handle shaped the way it is?

In the aircraft cockpits I've seen, the gear handles all seem to have the same general shape (they look like a little wheel). Is there a reason for this beyond simply making it absolutely obvious that ...
10
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2answers
3k views

Why does landing gear retract with an offset?

I've noticed this often in flight simulators, and have, to be honest, never paid attention to it in real life, though I'm quite sure it happens there too: When landing gear retracts (and I believe ...
8
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1answer
629 views

How do airliners prevent raising the gear on the ground?

GA aircraft use a squat switch to prevent accidental retraction on the ground. Do airliners use a similar system? I've heard some reference to a manual pin, I'd appreciate clarification on that.
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2answers
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What is the height of the Boeing 747-8 landing gear?

I can never find any information about the height of the landing gear on any airliner(can you put it into feet and inches).And Is the height of the 747-8 landing gear around the same height as the 737 ...
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1answer
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What is the stress tolerance of landing gear of commercial aircraft?

Context: The landing skills of commercial airline pilots vary widely -- ranging from the ability to routinely make feather-touch landings and taxi and almost imperceptible deceleration on the one hand,...
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1answer
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What are these parts on STOL/bush planes?

I've seen these (note the parts pointed to by the red arrows in the image) on the landing gear struts of Super Cubs and plenty of other STOL bush planes with large tundra tires. It looks like maybe ...
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3answers
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How are modern jets modified to takeoff/land on a dirt runway?

I've been reading a lot about the Soviet and Russian military aircraft, and it seems a lot of them are built to work on dirt runways, or modified to do so. How is this accomplished? Is it a simple ...
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3answers
6k views

Why doesn't the landing gear get raised on the first flight of a new airplane?

This image shows the A350 first takeoff high in the air and the landing gear is still down. Why didn't they retract it?
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3answers
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Why does the landing gear control have 3 positions (up/down/off) on Boeing 737-800?

I've noticed that Boeing 737-800's cockpit has a 3-position landing gear lever. During takeoff, the pilot moves the lever from DOWN to UP and then to OFF position. What's the point of the OFF position?...
10
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1answer
2k views

Why do some commercial aircraft have no landing gear cover? [duplicate]

The B737 has no cover on its landing gear, as may be seen in this picture. Doesn't this increase the air drag? Almost all other airliners have doors that close off the rubber of the wheels, for ...
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3answers
843 views

Would adding a fairing to landing gear to spin the tires before landing yield enough benefits?

I was reading answers to this question: How long do airliner tires last? Can this be improved? and it seems to be reasonable to keep things simple and rethread tires instead of designing motors to ...
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2answers
740 views

Do wheels continue spinning when gear retracted? [duplicate]

Do landing gear wheels continue spinning inside the landing gear compartment once the gear has been retracted or is there a mechanism that will stop them?
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4answers
15k views

Why don't modern aircraft have landing gear that can swivel to compensate for crosswinds?

When landing, crosswinds can be very expensive. They cause go-arounds, diversions to other airfields and even crashes. Currently pilots crab in the air to counteract crosswinds and, at the last ...
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8answers
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Is there a good reason why modern airliners can't have conventional landing gears (vs. tricycle landing gears)?

By "good reason", I mean a reason that we definitely cannot overcome with reasonable changes in aircraft design, control laws or procedures. As possible benefits of this I see a much smaller (= ...
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2answers
415 views

How much damage could a landing gear malfunction do?

How much damage could a total landing gear malfunction do to an airliner? Could the runway wear a hole through the plane?
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2answers
12k views

If the landing gear is stuck in an airliner, can the crew go down and manually open it?

There are several instances where we see the landing gear getting stuck before landing. In these kind of situations, can the crew, or one of the pilots, go down to the landing gear area and solve the ...
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2answers
3k views

How are forces on the landing gear reduced or compensated for at touchdown?

When an aircraft lands with the tires of the landing gear at rest, as soon as the the aircraft touches down, the landing gear experiences a large amount of wheel-spin up forces (because of the static ...
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2answers
9k views

How is the 737 main landing gear protected from weather?

I really like the 737, it is perhaps my favorite airliner. One curiosity of this aircraft (afaik, it is the only commercial airliner) is that the main landing gear has no cover: Here is another ...
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2answers
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Why is the main landing gear of the Cessna Caravan placed so far forward?

Why is it that the rear landing gear of the Caravan is placed so far forward? I understand that the center of gravity must lie somewhere in the middle between the nose gear and the rear gear but ...
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5answers
23k views

Why do airplanes have to retract landing gear?

Why do all the airplanes have to retract their landing gear, once they reach some specific height? Why can't they simply leave their landing gear deployed all through the flight?
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1answer
1k views

How does the landing gear damp vibrations?

How does a landing gear on an aircraft reduce the vibrations transferred to the airplane structure, while landing?
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2answers
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How would we calculate the load factor on an aerial vehicle while landing due to sudden gust loads?

In order to design the landing gear (wheels and suspension) of our model Airship, [say "m" kg -expected mass], I wanted to know, is there any way to calculate the loads which might be experienced by ...
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1answer
6k views

How heavy are the Boeing 747 landing gear?

Does anyone know how heavy are the combined landing gear on a Boeing 747? It would be interesting if someone has also weight statistics per gear (nose gear and the four other main gear).
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2answers
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What are the advantages and disadvantages of having a single castor wheel as compared to 2 wheels in an airship?

I am working on a project to create a mid-size airship having a payload of 25kg. I am in a bit of problem regarding choosing the appropriate landing gear design for it. Which design would be better, ...