Questions tagged [landing-gear]

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

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1answer
2k views

Are there any aircraft with powered landing gear?

My student asked me a question this morning. It was: A car drives by turning its wheels against the Earth. An airplane taxis by rolling on its wheels while the engines push against the air. Are ...
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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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Do landing strips suffer from potholes or rutting?

In companion to the other question asking about wheel tire tracks. Planes come down and stop with a significant amount of force which I would expect to cause either rutting or potholes. Are runways ...
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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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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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What are the advantages and disadvantages of having landing gear doors?

To make comparison easy, let us take the example of B737 and A320, both similar aircrafts with retractable landing gear. As seen on the photo below, the B737 doesn't have gear doors for the wheels, ...
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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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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 ...
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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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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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Does Nitrogen inside commercial airliner wheels prevent blowouts on touchdown?

I just watched the first episode of Inside Mighty Machine where civil engineer-turned-host, Chad Zdenek, discussed innovations of the 747. One innovation he discussed was the increased number of ...
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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 to execute a gear up landing on aircraft with low propeller?

On some GA aircraft such as the Piper Malibu, the propeller would touch the ground if the gear was up. How would you land the plane when gear actuators fail? I would pull out the mixture knob and ...
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Is there a best number of wheels per bogie?

I understand the need of having more wheels when the aircraft is designed to be heavier. The number of wheels per bogie and the number of bogies differ from an aircraft to another. For example, there ...
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What is the cause of the noise heard when the landing gear is deployed?

Why is it that on most airliners, when the landing gear gets deployed, you always hear a loud noise like a bang. Is this due to the equipment locking in place or is there some other reason? As an ...
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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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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 have double-bogie landing gear? Does Airbus have a specific reason for making such A320s?
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Why wasn't the 737 MAX's landing gear lengthened enough to mount the engines under the wings, rather than in front of them?

The reason Boeing originally added the MCAS to the 737 MAX was to compensate for a slight pitch-up moment generated by the engine nacelles at very high angles of attack. This pitch-up moment occurred ...
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1answer
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Why does the A-4 Skyhawk sit nose-up when on ground?

The rear of the plane is nearer to the ground, while the front part of the plane is away from the ground (see image below). Other planes are more flat. I think it was for high AoA but these planes ...
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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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1answer
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What does shimmy in nose landing gear mean?

While I was reading a small article on "Reasons for RTO", I came across a situation where the pilots aborted takeoff because of "landing gear shimmy". What does that mean?
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1answer
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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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Do aircraft tyres have inner tubes?

Do aircraft tyres have inner tubes? Modern small single-engine turboprops to the largest Jumbos. If not, did they ever have inner tubes? And if so, why were they discontinued?
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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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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?
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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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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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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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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 ...
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1answer
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How is Spitfire landing gear powered?

I have seen a WW2 movie where the pilot of the Supermarine Spitfire has difficulties to extend the landing gear as the engine is no longer running. This would be reasonable if the gear normally needs ...
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1answer
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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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Could landing gear weighing scales be used to detect lack of lift?

There have been several crashes due to ice on wings destroying lift. One of the issues with this is that you can't detect that you don't have sufficient lift until you're already in the air, way too ...
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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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Will the landing gear work mechanicaly in case of total power loss?

In case of a total power failure in all the aircraft systems like engine failure and APU failure, would it be possible to use mechanical means (Manually) to open the landing gear bay door and deploy ...
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Why did the backup landing gear deployment fail on LOT 16?

LOT 16 was a 767 which experienced a hydraulic leak, resulting in the failure of the landing gears and the proceeding belly landing shown below: Why did the backup ...
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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 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 ...
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Why is the Constellation's nose gear so long?

The Lockheed Constellation has an enormously long nose gear, which causes the aircraft to slant appreciably backwards when sitting on the ground: L-049 (Image by Greg and Cindy at Flickr, modified ...
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What did the “gear warning horn” on the North American P-51 sound like?

I'm working on a sound project for a P51 simulation and I'm having real trouble trying to find a reference on how the P51 gear warning horn sounded like. What mechanisms were used in the '40s to make ...
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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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How does the nose wheel lock on the Robin DR400 work?

I recently learned that there is a locking mechanism on the nose wheel of a Robin DR-400. This mechanism locks the nose wheel in place when there is no weight on the wheel. In particular, the wheel ...
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1answer
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What is the purpose of the small wheel at the end of the F-14’s launch bar?

At the end of the launch bar (catapult strop link) on the F-14 airplane, there is a small wheel. Does anyone know what this is used for?
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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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Has there ever been an uncommanded lowering of landing gear?

Has there ever been an uncommanded lowering of the landing gear on a large commercial jet? I could not find any instance of it in a preliminary google search. Could a simple short-circuit cause such a ...
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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 many miles before the runway should an airliner put the gear down?

I was watching this video of a FedEx MD-10 landing and some questions came up, of course again the unprofessional YouTube comments didn't help. How many miles before the runway should an airliner put ...
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Have landing gear collapsed at the gate?

Reading an answer to this question piqued my curiosity. Has there ever been an instance of an airliner's landing gear collapsing while loading/unloading passengers? I do not include after emergency ...
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Will landing gear with wheel fairings keep spinning due to airflow?

I asked this in a side note to a previous question, but I figured it warranted its own question. If a fixed gear aircraft is fitted with wheel fairings, even if you tapped the brakes after lift-off, ...
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1answer
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Does the 747-8 / A380 nose-wheel encounter more weight during braking?

Given that the nose wheels of both the Boeing 747-8 and Airbus A380, as is true for almost all aircraft, are not equipped with brakes, do they encounter more weight during braking? If so, how much ...
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1answer
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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.