Questions tagged [landing-gear]

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

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8
votes
1answer
1k views

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 ...
5
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1answer
595 views

On the new A320s when we do a brake check there is no need to call pressure 0 why?

Why do we have a give a pressure 0 call out when checking brakes while taxi on the old A320s but not in the newer A320s.?
3
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2answers
944 views

Why do we have to do an alternate brake check during preliminary cockpit preparation?

As part of the preliminary cockpit preparation in my company’s older A320s we have to perform an alternate brake system check but not in the newer ones as per FCOM Normal procedures as below. I found ...
3
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1answer
974 views

What is the maximum nose wheel deflection angle?

What is the maximum nose-wheel angle of deflection on modern commercial aircraft such as the Boeing 787? Can it deflect to 90 degrees or even more?
10
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1answer
3k 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 ...
0
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0answers
197 views

How long does the gear extension/retraction takes on the ATR-42?

Which is typical time of landing gear extension in normal conditions ? I would like to know it especially for the ATR-42 but any other typical value is welcome ! Furthermore can you provide any link ...
6
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2answers
967 views

Is wheel well overheat detection (not brake temperature sensor) necessary for commercial jet aircraft?

Some aircraft do have this detection system (many Boeing aircraft), some do not. Why? What's the main purpose of the wheel well temperature detection system, even though there are brake temperature ...
3
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1answer
1k 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?
6
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1answer
3k 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 ...
5
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1answer
2k views

How does the wheel speed sensor in a Boeing 777-300ER work?

I do have a maintenance manual that I found on Internet, but it doesn't have anything about the wheel speed transducer. Any pics along with the information would be helpful.
23
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6answers
20k views

Could airline tires be deflated in mid-flight to reduce weight?

As a means of weight reduction to reduce fuel consumption, could the tires on an aircraft’s landing gear be deflated once airborne then re-inflated just prior to landing? Is that feasible and safe?
5
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2answers
1k views

Are tracked landing gear systems still in use and development?

In the 1940's and 1950's, there were several tracked landing gear systems developed for the purpose of allowing landing on soft ground and/or using particularly heavy aircraft such as the B-36. Are ...
5
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2answers
677 views

Do airliners use light alloy wheels, like cars do?

Do large and small airliners - up to jumbos like the Boeing 747 and Airbus A380 - use light alloy wheels in their landing gear to reduce weight? If not, why not? Are there reasons unrelated to ...
8
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5answers
2k views

Has there ever been a seaplane with inflatable airbags rather than traditional pontoons?

Traditional pontoons are big and cause a lot of drag. It would be nice to retract them like normal landing gear but they are just too big. Has there ever been a seaplane with inflatable airbags ...
1
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0answers
179 views

Why are aircraft tires not pre-spun prior to landing? [duplicate]

Currently, as far as I know, most modern (big) airliners do not pre-spint the tires before landing. The question is why not, as there are certain benefits. This question was asked here before Why are ...
4
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4answers
1k views

Is it feasible to recuperate energy from landing aircraft by using a runway sled with regenerative braking?

Would it be feasible to land large (Boeing 747 and Airbus A380) and all other aircraft on a sled on the runway, the kinetic energy of the aircraft is then transferred to the sled, then the sled uses ...
0
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2answers
172 views

Is there a way for an aircraft to tell a ground station when the gear is down? [closed]

Is there any way that someone on the ground can be informed if the landing gear is down? It could be an ACARS message sent to the ground center, or a specific light (sequence) from the aircraft that ...
7
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2answers
2k 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 ...
2
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1answer
900 views

Can light aircrafts with no retractable landing gear make an emergency water landing? [duplicate]

In the suburbs of Lisbon today two people were killed because a pilot of a light aircraft (I imagine without retractable landing gear) landed on one beach full of people (it's Summer and the beaches ...
5
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1answer
6k 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 ...
9
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4answers
2k views

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 ...
27
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6answers
8k views

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 ...
22
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3answers
5k views

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 ...
20
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5answers
3k views

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 ...
2
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0answers
384 views

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 ...
13
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1answer
10k views

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 ...
15
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1answer
898 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 ...
4
votes
1answer
351 views

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 ...
2
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0answers
94 views

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 ...
14
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4answers
4k views

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 ?
21
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2answers
13k views

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 ...
5
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1answer
642 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 ...
4
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2answers
616 views

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
178 views

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 ...
3
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3answers
979 views

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 ...
6
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3answers
743 views

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 ...
11
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2answers
4k 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
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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
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3answers
24k 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
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2answers
3k 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 ...
11
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7answers
3k 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
424 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 ...
19
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3answers
11k 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
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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
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1answer
626 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
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2answers
298 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
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2answers
5k 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
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2answers
4k 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
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0answers
82 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
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4answers
33k 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.