Questions tagged [landing-gear]

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

Filter by
Sorted by
Tagged with
10
votes
2answers
3k views

What is this item on the nosewheel of the Sukhoi PAK-FA?

I noticed a small item on the rear side of the nose wheel in multiple images of the Sukhoi PAK-FA, shown below. The item in question appears to be a grille wrapping around the back of the tires and I ...
22
votes
2answers
6k views

Why do some A380 main wheels have no brakes?

The A380 has 20 main and 2 nose wheels. Apparently the nose wheels have no brakes (compare with Are there any aircraft with a nose wheel braking system?). While researching for this question (How are ...
65
votes
3answers
21k views

How are brakes cooled on heavy aircraft?

As kinetic energy is not stored or recycled, large quantities of heat have to be evacuated in a short period of time when aircraft abort their takeoff or land: B777 brake test, Youtube Which ...
5
votes
2answers
2k views

Why is the MiG-23 landing gear nontraditional?

The MiG-23 has a very nontraditional landing gear setup. Why has it been designed the way it has as opposed to the more traditional method of a single compression strut that is raised into the ...
9
votes
5answers
2k views

Has there ever been a tail-dragger with retractable tail-gear?

This comes from a slightly related question about drag from landing gear. A tail-dragger is the old-school layout of aircraft, particularly WW2-era fighters. It's also known as Conventional Landing ...
1
vote
1answer
395 views

How do aviation engineers ensure that the landing gear opens every time, without fail? [closed]

This is mostly with respect to large commercial airliners. I mean so many things can go wrong, then how have the engineers designed it to make it fail-safe? Or is it a very simple trick. Also, are ...
20
votes
3answers
9k views

What is the temperature of the brakes after a typical landing?

On an airliner, what is the temperature of the brakes after a typical landing, and how long does it take to cool down? Is it hot enough that mechanics should wait before servicing an aircraft that ...
7
votes
9answers
1k views

Can a commercial airline continue its flight if its landing gear fails to retract after take-off?

So after take-off, due to any reason, the landing gear does not re-tract, is there any standard procedure to be followed? Or can the airline continue with its flight? Also, I would like to know any ...
3
votes
1answer
553 views

How is the due date for landing gear replacement determined?

I want to know how calculate the due date of Boeing MD-83 Landing gear replacement (it is every 10 year or 20000 FC). Is it calculated from the installed date or shop visit date?
3
votes
2answers
271 views

Which is the technically correct term: Nose Gear or Nose Landing Gear?

Talking about landing gear system, came across my mind the correct and technical name. Is it NOSE GEAR or NOSE LANDING GEAR?
20
votes
2answers
4k views

Why is the nose landing gear of a Rutan Vari Eze up during parking?

I recently saw a Rutan Vari Eze parked at the airport and I was wondering why the nose landing was up during parking. How does it work for a pilot to get in? Can the pilot put down the landing gear ...
10
votes
2answers
3k views

How much extra drag does landing gear incur?

How much extra drag does landing gear incur? I'm interested in large commercial airplanes. For a concrete example, let's say a 747 flying at 1,000 m above sea level at 800 km/h. Edit: Looks like 800 ...
2
votes
0answers
71 views

What are the extra wheels for on the Harrier series? [duplicate]

On the Harrier series, what are the landing gears on the end of its wings for?
12
votes
4answers
23k views

Could a pick up truck save a plane with failed landing gear?

I recently saw this fictionalized video. While it's not real, I do wonder if this could be possible, even if not the best way to handle the situation.
12
votes
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 ...
9
votes
2answers
2k views

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. ...
7
votes
2answers
4k views

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 ...
2
votes
1answer
534 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 ...
8
votes
3answers
3k views

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
votes
2answers
5k views

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
votes
2answers
832 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
votes
2answers
3k views

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
votes
2answers
2k views

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
votes
2answers
1k views

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
votes
1answer
4k views

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 ...
47
votes
1answer
6k views

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 ...
45
votes
2answers
9k views

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
votes
2answers
2k views

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 ...
10
votes
5answers
5k views

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 ...
0
votes
2answers
2k views

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?
49
votes
3answers
16k views

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
votes
0answers
132 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 ...
2
votes
2answers
2k views

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: ...
0
votes
2answers
957 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 ...
24
votes
2answers
2k 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 ...
1
vote
2answers
1k views

Which compressed air and fluid are generally used by oleos?

Which compressed air and fluid are generally being used by oleo-struts?
40
votes
3answers
2k views

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 ...
13
votes
4answers
2k views

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 ...
38
votes
4answers
7k views

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
votes
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 ...
9
votes
2answers
2k 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
votes
1answer
586 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.
4
votes
2answers
10k views

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 ...
4
votes
1answer
3k views

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,...
9
votes
1answer
1k views

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 ...
19
votes
3answers
7k views

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 ...
10
votes
3answers
4k views

Why don't the landing gear go up on a 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?
47
votes
3answers
16k views

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
votes
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 ...
8
votes
3answers
768 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 ...