Questions tagged [landing-gear]

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

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1answer
887 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 ...
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0answers
473 views

What is the difference between a pressure switch, high-pressure control, and low-pressure control in a landing gear hydraulic system?

This is an Arrow II landing gear diagram. In the diagram, the high and low pressure controls look like check valves. The pressure switch is unclear. What are these three items, and what purpose ...
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0answers
375 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 ...
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0answers
93 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 ...
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0answers
81 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?
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2answers
888 views

How much more economical are planes with retractable gears vs. those with fixed gears?

Many small planes have fixed gears, some have retractable gears. All things being equal, the plane with retractable gears would have to be more expensive than fixed gears, as the mechanisms involved ...
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1answer
262 views

Exceeding VLO and by how much is too much?

Piper Seminole (PA-44-180) VLO (max gear retraction speed) is 109 KIAS. I've heard that manufacturer published limitations are significantly lower than actual structural and system limitations. What ...
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2answers
210 views

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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2answers
179 views

For large commercial aircraft, how are the tires changed?

Something at least the size of a 737, all the way up to the A380. How are aircraft tires changed for large commercial aircraft? Are they actually jacked up like with a car?
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2answers
2k views

What is the purpose of the shuttle valve in a Piper Arrow's landing gear system?

This is the PA-28R-201 landing gear hydraulic system diagram. I am wondering how this shuttle valve functions. Research I have done indicates that a shuttle valve blocks one attachment to the valve ...
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1answer
109 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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1answer
113 views

What are the three sources that are relayed to the brakes and steering control unit of an A320?

There is the sentence: Electrical signals from the three sources are relayed to the brakes and steering control unit (BSCU) and are computed into the nose steering angle. The question: What are ...
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1answer
419 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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1answer
129 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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1answer
326 views

How to determine the maximum servo torque required for a nose gear?

It's pretty much it. I know how to calculate the friction force on the nose gear for a three-point landing condition using the method set forth in ...
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0answers
147 views

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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0answers
113 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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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 ...
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2answers
3k views

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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1answer
137 views

How does landing gear affect thrust on a light twin-engine airplane?

I'm working on my commercial multiengine rating. And I got this question from my examiner, and I answered: landing gear produces penalty drag, so it decreases thrust. But the examiner says this isn'...
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2answers
171 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 ...
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2answers
1k views

If a tail dragger is converted to a tricycle gear airplane, what will be the effect on weight distribution?

If a tail dragger airplane is converted to one with conventional tricycle landing gears, how will this affect the balance of the airplane? It is possible to offset the effect by shifting weights ...
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2answers
876 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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1answer
161 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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1answer
150 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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1answer
489 views

What indication will appear in case of one of A320 LGCIU is inoperative?

What indication and where it will appear in case of one of LGCIU (landing gear control and interface unit) is inoperative?
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0answers
36 views

Vortices from the landing gear [duplicate]

Some time ago I was flying with my instructor on a C152. After take-off he said to me to push the brake pedals to stop the wheels rotating in order to reduce the wake from it. I have never heard about ...
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37 views

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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109 views

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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0answers
132 views

Landing gear sequence [duplicate]

{With reference to this video} Is there any particular reason that land gear retract half way then 2nd gear retract half way and then proceed to retract completely. Is it related to center of ...
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196 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 ...
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158 views

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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1answer
100 views

How is the impact force on the landing gear distributed in fighters?

Upon landing, what percentage of weight is distributed on the main and the nose landing gears of fighters? Upon landing of a fighter aircraft, what would be the approximate time of transfer of the ...
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1answer
347 views

Is it possible to remove an A320's main gear using one main jack and one nose jack?

I have only one set of jacks (nose-main LH and RH) and I need to swap the main landing gear from one aircraft to another. I don't have a dummy landing gear. Is this possible?
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1answer
124 views

Are hydraulic retractible landing gear possible

One of the impediments and drawbacks to extending landing gear in light of building larger engines are the larger space required for the taller gear. Would hydraulic retractable gear that works as a ...
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3answers
357 views

Why Buy A C182/172 Instead Of An C180/170? [closed]

So a thought came to my mind which covers not only Cessna planes but all others. The Taildraggers need a little bit less runway becayse AOA on takeoff is good and that AOA eliminates the need of ...
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1answer
285 views

How can I find the communication with ATC following an aborted landing?

On February 7th, I was on a UA 4694 from DEN to SAF, upon approach the landing was aborted; upon second approach, we heard the landing gear come down, which we did not hear on the first approach; the ...
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1answer
185 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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