Questions tagged [landing-gear]

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

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2 votes
1 answer
659 views

How does one "emergency extend" the right main landing gear of a B-52 Stratofortress?

In an April 11, 2024 video an embedded CNN crew documents a 33 hour B-52 Stratofortress round trip flight between Barksdale Air Force Base in Louisiana "flying near Russia, China, North Korea, ...
0 votes
1 answer
177 views

Does the B52 stratofortress nose wheel lock during takeoff and landing?

I wonder if the B52 nose wheel is still moving while takeoff and landing. Does it?
0 votes
0 answers
59 views

Gear down on climb out [duplicate]

i saw on a live stream from Manchester, that a Virgin A330, left the landing Gear down for 2-3 Minutes after take off, a smiliar scenario i saw on a stream from Heathrow, where British Airways and ...
20 votes
1 answer
3k 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 ...
5 votes
2 answers
1k views

Does the PA-44's squat switch disable the stall warning?

I've read the AFM and looked online about the gear system for the PA-44 Seminole and there is apparently a squat switch on the right main gear that disables the stall warning whilst on the ground. ...
5 votes
3 answers
2k views

What are the design disadvantages of a monowheel landing gear setup which might have led to its historic rejection?

Monowheels have a lot to be said for them, which is why we use them in gliders. They save weight, drag, and cost, are tolerant of tire failures, and frequently handle outlandings with aplomb. However, ...
11 votes
3 answers
4k views

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 ...
17 votes
4 answers
6k views

What causes a Cessna 172 and its gear to shake violently after landing and braking?

I am sure this was due to my own ignorance on proper technique, but immediately after landing in a Cessna 172, I applied brakes and some moderate aerodynamic braking and experienced an awful and ...
3 votes
1 answer
638 views

What is the linkage connecting the body landing gear on the C-130?

I can't seem to find a diagram that includes this tube linking the front and rear body gear on each side. Is it structural, or hydraulic, or maybe something else entirely? Image source: https://www....
14 votes
2 answers
15k 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 ...
17 votes
5 answers
4k views

Why does the Harrier jet have four landing gears?

I was looking at pictures of Harrier jets and I noticed something — they have four landing gears. That seems pretty unusual for a fighter jet, as most have only 3 landing gears in a triangle ...
2 votes
1 answer
139 views

How do I get rated to fly complex aircraft that are still Microlights?

In the most recent issue of the BMAA magazine, there are new aircraft listed that are still Microlights, but have complex features. These include Autopilot(!), retractable landing gears and even ...
0 votes
0 answers
121 views

What happens if the current ICAO method disagrees with double wheel/dual tandem etc?

Is the old U.S. method (a weight max for each landing gear kind) simply ignored? Planes with 3, 12, 14 and 22 wheels are common after all but gear types with those numbers often aren't listed. If the ...
11 votes
2 answers
2k views

Is it feasible to add an aftermarket hydrofoil to a light aircraft?

Could long, aftermarket hydrofoils be added to the water-skids of a plane (like this Cessna with pontoons or smaller) Cessna 208 Caravan not designed to have a hydro foil, to increase its ability to ...
17 votes
3 answers
3k views

Would spinning bush planes' tundra tires in flight be useful?

Short take off and landing bush planes are often fitted with very large diameter and width tires, so called tundra tires so that rough terrain can accomodate to the plane when both meet. Sometimes ...
0 votes
0 answers
282 views

Is it against the regualtions to install a dummy set of landing gear during aircraft maintenance?

We will be removing a set of landing gear for overhaul, so we are arranging a set of unserviceable landing gear to keep the aircraft mobile. I would like to know if doing so is against any FAA or EASA ...
15 votes
3 answers
7k 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?
0 votes
1 answer
130 views

Are landing gear bay doors meant to help high lift devices at producing lift, when gear is extended, regarding airliners?

Watching some video of one Mig-31 taking off, one can see those doors circled in red in the picture sourced from it, are those meant to produce net lift and reduce take off and landing distance/speed? ...
22 votes
1 answer
6k views

Why was the nose gear of Concorde located so far aft?

Was this because of the drooping nose preventing it from being placed anywhere further up?
16 votes
3 answers
3k 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 ...
3 votes
1 answer
432 views

Nose wheels with camber [duplicate]

What is the reason for the inward slanting nose wheels on a Lockheed Constellation? Are there other aircraft with same design.
1 vote
1 answer
263 views

How do you clean B737 Wheel Wells?

just wondering, is there any tools used to clean main/nose landing gear bay? I was thinking some machine with steam water or hot water high pressure and solvents. wondering what is the best cleaning ...
0 votes
1 answer
232 views

who can do an overhaul of landing gear?

A manufacturer requires the landing gear of an aircraft to be overhauled at a 10 year interval. Can any maintenance facility perform this work or does it need to be an approved facility. This is for a ...
10 votes
6 answers
4k views

Has a commercial aircraft ever taken off with its landing gear up?

In the extremely scientifically accurate movie Airplane the Autopilot takes off with the gear up. Has this ever happened? Could any commercial or 4+ passenger GA aircraft do this, say with a 1%+ ...
1 vote
2 answers
1k views

Landing gear drag and weight calculations

I have read numerous books and researches, but I couldn’t find any formulae that actually work for how to calculate the following (for commercial aircrafts): 1- Drag coefficient for a retractable ...
33 votes
4 answers
5k views

Why was the skid landing gear located so far aft on the X-15?

The X-15 famously used a pair of steel skids as the main landing gear rather than conventional wheels, which saved weight, allowed the skids to be mounted externally (where wheels and tires would have ...
7 votes
1 answer
5k views

Runway landing with a front skid instead of wheel - how does steering happen? (Dreamchaser)

The Spaceflight Now article Sierra Nevada’s Dream Chaser performs critical glide test flight shows the Dreamchaser performing a runway landing using a front skid and two wheels. The skid extends ...
3 votes
1 answer
499 views

How would a wheel-well stowaway have performed on a Concorde?

There have been many news reports of stowaways who hide in the wheel wells of subsonic airliners and survive the flight. I assume this would not be survivable with a Concorde because they'd be unable ...
9 votes
1 answer
4k views

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 ...
3 votes
1 answer
3k views

How is the debris deflector on the DC-9-80 ("MD-80")'s nose gear kept from striking the ground during landing?

The DC-9-80 (marketed as the "MD-80") has, mounted to its nose gear, what I presume to be a debris deflector (a sled-shaped device to keep the nose gear from kicking up pieces of gravel or ...
17 votes
2 answers
6k views

Why does the 767’s main landing gear appear spaced considerably farther apart than airplanes of a comparable size?

Below is a comparison of the 767, 787, and A350 main landing gear. The larger distance on the 767 also appears to make the airplane lower to the ground.
11 votes
1 answer
7k 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).
14 votes
4 answers
4k views

Why should an overheated wheel be approached from the front/back and not in line with the axle?

According to the CAAIP (Civil Aircraft Airworthiness Information and Procedures):/ 10.4 Tests have shown that the safest extinguishant to use is a dry chemical agent and this must be used whenever ...
9 votes
2 answers
2k views

How much momentum is lost through the wheels when landing?

I am idly curious whether any significant proportion of a landing plane's momentum is lost through wheel braking vs. everything else like thrust reversers, aero drag, etc? If I have to pick a plane, ...
9 votes
4 answers
3k views

Should an emergency field landing be performed with landing gear down or up?

Suppose you are flying an aircraft with retractable gear and have to make an emergency landing on that big "flat" stretch of grass up ahead and have only one shot at it, what's better, do it with ...
40 votes
4 answers
9k views

Do military bases still employ wheel watchers?

When I was in the air wing in the '70s, I had the unpleasant opportunity of pulling wheel watch. The unfortunate individual sat in a small shack (maybe 3 x 6 ft.) with a pair of high-powered ...
4 votes
2 answers
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 ...
50 votes
3 answers
23k 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 ...
11 votes
1 answer
1k views

On the A330 why does switching off the ADRs require alternate LG extension and inhibit nose wheel steering?

In the incident examined in this video the pilots experienced an unreliable airspeed indication due to pitot tube blockage in an A330. They followed the abnormal checklist for unreliable airspeed ...
5 votes
3 answers
867 views

Why does the hydraulic pump of retractable-gear GA aircraft run continuously throughout the gear cycle?

The POH of a Cessna T210N (which is a retractable-gear aircraft) states that the hydraulic pump will run 1 - 2 times per hour to restore system pressure bleed down, and whenever the gear up / down ...
16 votes
3 answers
4k views

Landing gear: why is there a maximum altitude for safe retraction?

According to this article, the Dash 8 has a "maximum altitude for safe retraction". This wording implies that there is some danger of retracting the gear above a certain altitude. Is this ...
19 votes
2 answers
5k views

Why do the 747's wing gear tilt while airborne, but not its body gear?

The 747's sixteen main-landing-gear wheels are distributed over four bogies: two four-wheel wing gear, mounted underneath the inboard wings, and two four-wheel body gear, mounted under the fuselage ...
20 votes
3 answers
6k views

Is landing gear-up against the regs?

Typically, landing a plane gear-up results in costly damage, which easily triggers the NTSB reporting requirement. However, as a glider pilot I can easily see how landing a glider gear-up would cause ...
4 votes
2 answers
2k views

Who manufactures the landing gear on the Airbus A350 series aircraft?

Where are they made? I assume that they are made out of titanium. Right?
7 votes
5 answers
12k views

What are the advantages and disadvantages of tail wheels that cause modern airplanes to not use them?

Photos' source: Cessna 140 and Cessna 150. According to Wikipedia here, the Cessna 150 is successor of Cessna 140. Both have two-seat capacity and a single engine. Why was the Cessna 150 changed to ...
10 votes
3 answers
5k views

How does the landing gear downlock mechanism work?

How does the landing gear downlock mechanism work? Especially when it's operated without hydraulic pressure or other energy sources. How can it keep the landing gear down and locked, during a gravity ...
7 votes
1 answer
2k views

How did the Boeing 777X's main landing gear lift before the nose on its first takeoff?

Source: Boeing 777X Takeoff for its First Flight Is this from a low payload and the configuration of flaps? Or perhaps a pilot pushing the yoke forward while the plane wants to lift?
6 votes
2 answers
4k views

Why don't small aircraft produce tyre smoke when landing, but big aircraft do?

On almost any recording of big aircraft landing, a huge cloud of smoke can be seen. This even applies to the relatively small Cessna Citation. But I never saw such smoke, at least not visible one, on ...
2 votes
2 answers
500 views

Did any Cessna Centurion ever have floats or amphibious floats?

Most of the Cessna aircraft are also available with floats / amphibious gear. But I could find no information of a Cessna Centurion with floats or amphibious gear. Is the Centurion really not water-...
76 votes
1 answer
12k views

How is tire rubber removed from the runway?

Every time an aircraft touches down, the tires are spun up rapidly. As a result, some rubber is left at the touchdown zone. (image source) As time goes on, more rubber is accumulated at the ...

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