Questions tagged [landing-gear]

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

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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 ...
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5 votes
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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 ...
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What is the hydraulic fluid capacity of the Cessna 210?

What is the hydraulic fluid capacity of the hydraulic fluid reservoir and the complete hydraulic system of a Cessna 210 ? (the N model, if it makes a difference) I've looked in the POH, in the service ...
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16 votes
3 answers
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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 ...
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19 votes
2 answers
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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 ...
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20 votes
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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 ...
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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 ...
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5 votes
2 answers
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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 ...
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14 votes
4 answers
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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 ...
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2 votes
2 answers
195 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-...
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3 votes
1 answer
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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 ...
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3 votes
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What do the numbers and letters mean in landing gear tire sizes?

I've got these two tire sizes: 27 x 8.5 R12 16 PR, H42 x 15.0 R21 26 PR. Can someone tell me what each of these numbers and letters mean? Also, if the diameter of the rim of the wheel is not included ...
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1 vote
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Why do the landing gears of Boeing 767 and certain Airbus aircraft tilt down? [duplicate]

I need help and some explanation on why are they sometimes tilted down instead of up.
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5 votes
1 answer
874 views

When is it appropriate to foam a landing strip? (example JB292)

Background: I recently watched the Channel5 documentary on JetBlue 292 with their famous sideways landing gear. At around the 8:00-mark you see footage of the actual landing: Main landing gear intact ...
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2 answers
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Are some tail wheels made out of solid plastic?

Are any tail wheels on small planes made of hard, rounded, plastic-like material?
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1 answer
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Why does it feel like a plane stops in mid-air during approach?

At some stage while on approach to an airport in a commercial jet, it feels like the plane is almost coming to a complete stop in mid-air. Is this maybe as a result of the flaps engaging or the ...
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14 votes
4 answers
3k views

Why are/were there almost no tricycle-gear biplanes?

A friend recently asked me: are there any tricycle-gear biplanes? After hunting around, we found the Waco AVN-8, but that's all. This causes me to ask: is there an aerodynamic or other design ...
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How much energy does unretracted landing gear consume?

I am interested in finding energy consumption (% kN) of unretracted landing gear (on a jet fighter) per hour. Although the shape and size tell us how much drag is being produced I need a general rule ...
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Two- and three-wheel undercarriage in the same airplane?

Are there any airplane types which have the capacity to land in a tricycle configuration and a tail dragger configuration in consecutive landings? I have one example in mind but wonder whether there ...
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23 votes
2 answers
5k views

What operation is this aircraft performing?

While reading Wikipedia about Ust-Kut Airport, I've run into the following picture: I'd like to know which operation is depicted here? This doesn't seems to be a take-off, as per my very limited ...
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6 votes
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Why do landing gear bays in commercial aircraft not have a fire extinguishing system?

Landing gear bays in modern commercial aircraft have fire detectors installed, but there is no fire extinguishing/suppression system in this area. What is the logic behind having fire detection in ...
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Diamond DA42 - Do you need the electric master on to extend landing gear?

For the Diamond DA42 (TDI) Learning my electric fire emergencies. Would it be wise to extend the landing gear before electric master is turned off? Does the (hydraulic) gear power pack require the ...
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-5 votes
1 answer
420 views

Why is there no alternative mechanism to extend and lock the landing gear in case of failure? [closed]

As we know, most passenger planes have redundant systems in case of failure of a mechanism. For example, in case of failure, that specific thing can be operated by another alternative method, ...
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5 votes
2 answers
711 views

Why is the landing gear lever not set to OFF on the ground?

Several older airliners (e.g. Airbus A300, Boeing 737 until the NG series, Boeing 747 until the -400 series) have landing gear levers with three positions: UP, OFF and DOWN. OFF (or NEUTRAL for Airbus)...
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Why is the assumed Lift-to-Weight-Ratio for the limit drop test for heavy aircraft (FAR-25) higher than for small aircraft (FAR-23)?

The FAR-25.725 assumes a Lift-to-Weight-Ratio L/W = 1 for the landing gear drop test while the FAR-23.725 assumes only L/W=0.667. This factor affects the load inertia factor n which is also needed for ...
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10 votes
2 answers
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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 ...
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2 votes
1 answer
239 views

Are there all terrain landing gears for planes?

Is there a landing gear set up that will allow a single engine plane (also, allowing for tundra tires than what is not available for current water skids) to land on rough grass and water? The wheels ...
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9 votes
2 answers
282 views

What is dual mode adaptive landing gear system?

Referring to the NASA document Design and Development of the Blackbird: Challenges and Lessons Learned. On page 31, there's a mention of dual-mode adaptive landing gear, which is quoted below. ...
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0 votes
1 answer
480 views

How does the B777 Side brace locking mechanism work?

The B767 has jury strut actuators and their working is pretty straight forward. They oppose the collapsible geometry of jury strut and lock them in the over centre locking position. But for B777 this ...
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11 votes
1 answer
3k views

Can the Landing gear be lowered when system A hydraulic pressure is lost in Boeing 737?

In the FCOM OF BOEING 737 HYDRAULIC SECTION I went through the part Landing gear transfer unit that it is used to raise the landing gear at a normal rate when system A EDP volume is lost. My query is ...
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1 vote
1 answer
142 views

How do rotor tangs lock into wheel keyways?

How do the rotor tangs lock into wheel keyways? Are there special keys on the outboard wheel half that allow locking the tangs in place? Also would be great if anyone could provide me with a image of ...
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3 votes
4 answers
2k views

Why landing gears still need bungee springs?

While studying landing gear, I came across this term 'bungee spring' to which there was no definitive explanation in text with regards to its usage. So in the image, you can see for the jury strut/ ...
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2 votes
2 answers
470 views

Are General Aviation tires filled with Nitrogen?

Long story short, I'm working on a concept for a book. We all know why commercial aircraft have nitrogen tires, but my question is if GA aircraft have nitrogen tires, or are they just filled with ...
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1 vote
0 answers
250 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....
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20 votes
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Would deploying the Space Shuttle's landing gear early have improved safety? [duplicate]

Due to the space shuttle orbiter’s high weight (potentially up to 110 tonnes [121 short tons] in certain abort scenarios, although nominally around 85 tonnes [94 short tons]) and abysmal subsonic ...
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3 votes
1 answer
740 views

Do the A-320 landing gear extend if the mechanism is activated above a limiting speed?

I've been told that on the A-320, if the landing gear lever is lowered with the airspeed above a limiting speed, the system will not extend the landing gear. Further, once the aircraft is slowed to an ...
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1 answer
238 views

Why do some fighter jets have double wheels in the front gear whereas some other aircraft have a single wheel?

The Typhoon has a single wheel in the front gear, but the Rafale or Gripen have double wheels in the front gear. What is the reason for this difference?
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14 votes
3 answers
4k views

Are there any aircraft with a 4-wheel nose landing gear and a 16-wheel main landing gear?

Are there any aircraft with a 4-wheel nose landing gear and a 16-wheel main landing gear? I need this to answer my review of an aircraft design project.
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2 votes
1 answer
201 views

Is the KC-135 landing gear life limited?

I'm looking for information about the KC-135 landing gear. Specifically I want to know if its life limited and if so where is it documented? If its NOT life limited where is that documented? I'm ...
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3 votes
1 answer
344 views

Why is the nosewheel of the MiG-29 placed in front of the engine intakes?

Why do MiG-29 have a front-wheel of landing gear placed in front of an intake? would not it throw water or stones into the intake as mentioned in Raymer? I am designing an aircraft based on the ...
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10 votes
3 answers
5k views

What is the piece that covers the top part of tires?

I would like to know the name and the usefulness of this piece that covers the top of the tire of some planes, such as some Cessnas.
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1 vote
1 answer
157 views

Who decides when landing gear requires an overhaul?

"If the landing gear on your aircraft is required to be overhauled periodically..." So is there a case where its been decided that landing gear does not require to be overhauled?
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7 votes
1 answer
1k 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?
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28 votes
1 answer
5k views

Why did the space shuttle use bias-ply tyres instead of radials?

Aircraft and automobile tyres can be divided into two main types, based on the orientation of the tyres’ body plies (the layers of tough fabric that form the main structural body of the tyre); radial ...
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2 votes
2 answers
257 views

What is the difference between a 'live' NLG axle and a 'fixed' NLG axle?

What are the advantages / disadvantages of a live and fixed nose landing gear axle and how do they work? Maybe certain aircraft need a particular type fitted? I can't see the need of a moving axle (...
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0 votes
0 answers
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What are the specifications of this Zenith bush airplane's gear and tires?

I would like to know the name (if any) and the specifications of Zenith's bush airplane? I would like to know the size, the diameter, the maximum load, bearing number/type, and so on. Seems that the ...
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0 votes
2 answers
2k views

Why does the A320 have an anti skid system and how does it work? [duplicate]

Can somebody explain why do A320 aircraft have an anti skid system? What is its purpose? And a brief explanation on how it works.
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30 votes
2 answers
5k views

What is the purpose of the Dash 8’s “TOUCHED RUNWAY” warning light?

The DHC-8-400 (and possibly other DHC-8 variants) has (or, at least, had in late 2007, according to Appendix G of this AAR) a warning light labelled “TOUCHED RUNWAY”. The extract of the DHC-8-400’s ...
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11 votes
1 answer
3k views

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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8 votes
1 answer
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Why does the A330 sit nose-down on the ground?

The passenger versions of the A330 have a small but noticeable nose-down angle when sitting on the ground: (Image by contri at Flickr, via russavia at Wikimedia Commons.) In contrast, A330s built as ...
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