Questions tagged [landing-gear]

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

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1answer
5k views

What defines a landing gear bogie?

(Wikipedia) A Boeing 737 main landing gear arrangement. What defines a landing gear bogie (truck)? In its airframe maintenance handbook, the FAA defines it as: When more than two wheels are ...
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Is there no warning if landing gear is not retracted during flight?

I know that most aircraft have a warning system which makes beeping sounds if an aircraft tries to land without the gear down. After reading this news article about an Air India flight 676 flying ...
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Why use an airplane with non-retractable landing gear for aerobatics?

I'm watching footage from Red Bull Air Race 2017 in Kazan (one example is ) and clearly at least some of the airplanes used have non-retractable landing gear. I was ...
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3answers
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Is there a landing gear system that extends automatically to prevent belly landing?

To my knowledge, most aircraft with retractable gear are equipped with a landing gear warning system that makes repetitive beeping sounds in case the pilots try to land without the gear down. I ...
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5answers
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Is it better to shut down the engine(s) or leave it (them) running when a gear up landing is imminent?

Is it better to shut down the engine(s) or leave it (them) running when a gear up landing is imminent? I noticed that the pilot in this video chose to shut down his engine before touching down during ...
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0answers
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How does the nose wheel tire stop rotating on retraction as the aircraft takes off? [duplicate]

As we know, the nose wheel tire and main gear tires are rotating when aircraft is taking off and the wheels are retracting. Thus there should be a mechanism to stop this rotation in order to prevent ...
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1answer
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Why do some A320s have double-bogie landing gear?

I believe this is actually a rare sighting, but why do some A320s such as the VT-ESD have double-bogie landing gear? Does Airbus have a specific reason for making such A320s? Update: Found an image ...
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1answer
840 views

Why is the Antonov 225 (almost) always chocked at the third wheel?

Recently I was looking over pictures where the An-225 is parked (because that's a normal thing for a normal person to spend their time doing). I noticed that the chocks are almost always placed around ...
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1answer
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Would shooting the tyres prevent a takeoff?

In the movie Fast & Furious 6, among other questionable parts of one scene, they try to prevent a very large aircraft from takeoff. As opposed to whatever they tried, how effective would it be in ...
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0answers
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Why is there only circumferential treading on the nose wheel? [duplicate]

The pilot uses the nose wheel for steering on the ground, still all the tires on the aircraft use the same treading. Why are there no treads perpendicular to the rotation direction? I know that most ...
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4answers
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Does it make sense to do an emergency landing without nose gear in order to reduce stopping distance?

Would a pilot decide to land without the nose gear down to increase friction if for example all the engines have suffered a flame-out and there is only a very short runway available ?
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How do fire crews handle hot brakes?

Let suppose an emergency aircraft has made an overweight landing. The brakes are white hot, and the fire crews are requested to be on scene. What can be done about the hot brakes? Can they just shoot ...
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1answer
597 views

Why are there so many moving parts used in the landing gear?

This short clip of the landing gear on a Hawker 850XP being retracted seems extremely complex. I'm curious to know why there are so many moving parts but as a layman I'm struggling to make sense of ...
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2answers
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Why does the Grumman Bat feature inverted winglets?

I've been fiddling around with trying to make a blended wing body aircraft. While modelling, I heard from someone that the design reminded them of the Swift Killer Bee (now Grumman Bat). One distinct ...
4
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1answer
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Is the Dassault “ministop” related to the Dunlop Maxaret ABS?

Dassault fighters e.g. Ourargan and Mystere had Anti-lock devices called "Ministop" on main landing gear brakes. Anybody has a picture / drawing / detailed description ? Is the Ministop related to the ...
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3answers
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Have Eddy current brakes ever been used/tested on an aircraft?

Eddy current brakes (wiki) --- a.k.a. magnetic brakes --- get quite some attention from train engineers. They are used on Shinkansens, roller coasters, and even (as far as I know) metro trains on Lane ...
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Is it feasible to replace brakes on airplanes with electric motor/generator?

Would it be feasible to replace the brakes on airplanes with electric motor/generator drive systems? There are two problems I see with airplanes. When they land, the tires are not spinning to match ...
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2answers
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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 ...
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2answers
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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 ...
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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 ...
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2answers
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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 ...
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7answers
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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 ...
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1answer
406 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 ...
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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 ...
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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 ...
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1answer
590 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?
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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?
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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 ...
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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 ...
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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?
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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.
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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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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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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
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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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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 ...
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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 ...
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2answers
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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 ...
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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? ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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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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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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 ...
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0answers
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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: ...