The torque links allow the piston to move freely in and out of the landing gear cylinder, but prevent it rotating. The torque links can be adjusted to achieve and maintain the correct wheel alignment. Torque links are also called scissors and nutcrackers.
What is the function of a torque link on a landing gear strut quizlet?
What is the purpose of a torque link on an oleo strut? To keep the wheel in alignment and prevent the piston from coming out of the cylinder.
What is torque link in landing gear?
In the landing gear assembly of an aircraft, the torque links connect the two telescoping cylinders and prevent the relative rotation of the piston to maintain the wheel alignment during taxiing on ground. However, it contributes to the dead weight during flight of the aircraft. … The torque link is designed in CREO3.
What is the purpose of a torque link on an oleo strut?
Most oleo struts are equipped with a torque link, or scissor link, that connects the upper cylinder and lower piston to prevent rotation of the piston within the cylinder and to maintain alignment of the wheel. The torque link contains a joint in the middle to allow piston retraction and extension.
What is the primary function of torsion link on a landing gear?
The trunnion is a fixed structural support that is part of or attached to the upper strut cylinder of a landing gear strut. It contains bearing surfaces so the gear can retract. While in the vertical gear down position, the trunnion is free to swing or pivot.
What is a torque link damper?
There is a torque-link damper at the interface of the upper and lower torque-links. The torque-link damper absorbs the vibrations that can occur during landing. … The valves are used to fill the shock absorber with hydraulic fluid and nitrogen.
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Why is it important to keep the gear wheels properly aligned?
Besides tyre wear and wear patterns, the more important reason why wheel alignment is important for safe driving is the need to reduce stresses and strains on vehicle suspension components and improve the handling of the vehicle. … Uneven tyre wear – Tyre wear and tyre health are greatly affected by misalignment.
How much hydraulic fluid should be put into an oleo strut?
Typically it takes around a gallon of hydraulic fluid to service three struts. Nitrogen is better than compressed air for strut servicing because it is drier and doesn’t vary in pressure as much as air, it is also less corrosive to the inside of the strut housing.
What absorbs the initial landing impact in an oleo strut?
An oleo strut is a pneumatic air–oil hydraulic shock absorber used on the landing gear of most large aircraft and many smaller ones. … A steel coil spring stores impact energy from landing and then releases it, while an oleo strut instead absorbs this energy, reducing bounce.
Why would it be necessary to deflate the landing gear shock struts before the removal of an engine?
After ensuring that all fuel to the engine is shut off, disconnect the battery to eliminate the possibility of a hot wire starting a fire. … In addition, the landing gear shock struts can be deflated to prevent them from extending as the engine weight is removed from the aircraft.
How does the strut strengthen the landing gear?
Spring Steel Struts
These aircraft use strong, flexible materials like steel, aluminum or composites to help absorb the impact of a landing. As your plane touches down, the springs flex upward, dissipating and transferring the impact load to your airframe at rate that (hopefully) doesn’t bend your plane.
What device in an oleo strut controls the rate of flow between one chamber and the next?
The taper of the pin controls the rate of fluid flow from the bottom cylinder to the top cylinder at all points during the compression stroke. In this manner, the greatest amount of heat is dissipated through the walls of the strut.
What does oleo imply with regards to shock struts?
a shock-absorbing strut in the landing gear of some airplanes, consisting of a telescopic cylinder containing oil.
What is non absorbing landing gear?
[Figure 13-13] The most common example of this type of non-shock absorbing landing gear are the thousands of single-engine Cessna aircraft that use it. … Non-shock absorbing struts made from steel, aluminum, or composite material transfer the impact forces of landing to the airframe at a non-damaging rate.
What is drag brace in aviation?
A drag brace is used to restrain against the pivot action built into the trunnion attachment. The upper end of the two-piece drag brace is attached to the aircraft structure and the lower end to the strut. A hinge near the middle of the brace allows the brace to fold and permits the gear to retract.
When working with high pressure high performance tires Why is it recommended to deflate the tires when removing wheels from the axle?
(8314) – When working with high pressure, high performance tires, why is it recommended to deflate the tires when removing wheels from the axle? To ensure safety in case of a defective wheel or broken tie bolts.
How do you know if your alignment is right?
How Do You Know If You Need a Wheel Alignment?
- Your vehicle pulls to one side.
- Uneven or rapid tire wear.
- Your steering wheel is crooked when driving straight.
- Squealing tires.
What is difference between wheel alignment and balancing?
The Difference: Wheel alignment is the term for how your wheels sit when mounted to your car and wheel balancing is what’s done to perfectly balance the weight of a tire and wheel assembly so that it travels evenly.
What are the three possibilities of wheel alignment?
There are three main aspects to wheel alignment: camber, caster, and toe. By attaching special laser measuring equipment to the wheels it is possible to read the angles of these.
What helps control oscillations of the nose gear?
A shimmy damper helps control oscillations of the nose gear. Nose gear struts are often equipped with a locking or disconnect pin to enable quick turning of the aircraft while towing or positioning the aircraft when on the ramp or in a hangar.
What regular inspection should be made of the exposed portion of a landing gear strut?
What regular inspection should be made of the exposed portion of a landing gear strut? Clean and inspected for damage and proper extension.
How does a retractable landing gear work?
Retractable landing gear reduces an airplane’s drag, increasing CRUISE speed and glide distance. … For emergency gear extension, the hydraulic pressure holding the gear up is released, and the gear freefalls into the extended position, a spring helps to push the nose gear forward against the airflow.
What are the different types of shock absorbers used in landing gear?
These are telescopic strut, articulating strut and semi-articulating strut. The main difference between these three types of oleo shock absorbers is the positioning of the landing gear strut relative to the wheel and whether the shock absorber is structurally rigid with respect to the airframe.
What are the 4 types of landing gear?
There are 4 basic categories of Landing Gear that General Aviation planes use: Tricycle, Tail-Wheel (Conventional), Pontoons, and Skis. Tricycle Gear planes are by far the most common, as they are only marginally heavier than the older Tail-Wheel design but have several advantages.
What are the three types of landing gear struts?
Landing Gear Components &, Equipment:
- Struts transmit shock loads of landing, takeoff, and taxi to the airplane structure.
- There are three types of landing gear struts: Bungee. …
- Bungee Struts: …
- Spring Struts: …
- Oleo Struts:
What is the part that attaches to the landing gear shock strut flange upon which the other components of the brake are assembled?
The carrier assembly, or brake housing with torque tube, is the basic unit of the segmented rotor brake. It is the part that attaches to the landing gear shock strut flange upon which the other components of the brake are assembled.
What should be checked when a shock strut bottoms out?
What should be checked when a shock strut bottoms during a landing? the direction of fluid pressure. allow full debooster piston travel without fluid from the high pressure side entering the low pressure chamber.
Why do modern aircraft designs use 2 piece wheels?
The two piece wheel construction, are of 2 types, removable rim or split wheel. 12. INBOARD WHEEL HALF Wheel halves are not identical. The primary reason for this is that the inboard wheel half must have a means for accepting and driving the rotor(s) of the aircraft brakes that are mounted on both main wheels.
How strong is plane landing gear?
This strut is the heart of the landing gear, the mechanism can support around 500 metric tons (about 1 million pounds) plus the forces of an aircraft landing.
Is a strut a shock?
The basic difference is that a shock is an independent component, while the strut combines the shock and other features in a single structural unit. Both help to stabilize the vehicle and keep the tires in contact with the pavement. Without shocks, your vehicle would bounce down the road.
What is the main advantage of having a forward retraction landing gear?
The gear is designed to be able to unlock and freefall on demand when hydraulic pressure to operate them are lost. Retracting forward helps that since when the gear is being lowered, the wind pushes it into down position.
What is torque link?
Torque Links. The hinged link between the piston and cylinder of an oleo-type landing gear shock absorber. The torque links allow the piston to move freely in and out of the landing gear cylinder, but prevent it rotating. The torque links can be adjusted to achieve and maintain the correct wheel alignment.
What is the function of a torque link on a landing gear strut quizlet?
What is the purpose of a torque link on an oleo strut? To keep the wheel in alignment and prevent the piston from coming out of the cylinder.
What is the purpose of the oil and the nitrogen in an oleo pneumatic strut?
the oil supplies the damping and lubrication function, the nitrogen supplies the heat-dissipation function.
How does a main landing gear shock strut absorb landing shocks?
As the aircraft touches down, the piston travels up into the cylinder, forcing hydraulic fluid through the orifice into the upper chamber. Gas in the upper chamber, functioning like a spring, is compressed by the hydraulic fluid to absorb the impact of touchdown as well as bumps during taxiing.
What is a shimmy damper?
The shimmy damper (or dampener) is a hydraulic shock absorber installed on either the nose or main wheel forks and is attached to the aircraft structure. … The slow movement of the piston allows the wheels to pivot so the aircraft can be steered on the ground.
How much hydraulic fluid should be put into an oleo strut?
Typically it takes around a gallon of hydraulic fluid to service three struts. Nitrogen is better than compressed air for strut servicing because it is drier and doesn’t vary in pressure as much as air, it is also less corrosive to the inside of the strut housing.
How does the strut strengthen the landing gear?
Spring Steel Struts
These aircraft use strong, flexible materials like steel, aluminum or composites to help absorb the impact of a landing. As your plane touches down, the springs flex upward, dissipating and transferring the impact load to your airframe at rate that (hopefully) doesn’t bend your plane.
Which is better to use the landing skid or the landing gear?
Which one is better depends on the mission the helicopter is performing. Skid landing gear is simple and lighter weight, so it is the best choice for small helicopters as weight is always a consideration. Also, skid landing gear needs very little maintenance, but the drawback is that ground handling is more difficult.
Which is more efficient fixed or retractable landing gear?
There is one huge advantage of retractable landing gear, and that is higher speed and lower fuel consumption, due to significant reduction of aerodynamic drag. And that’s the only reason airplanes get retractable gear.
What is a torque link damper?
There is a torque-link damper at the interface of the upper and lower torque-links. The torque-link damper absorbs the vibrations that can occur during landing. … The valves are used to fill the shock absorber with hydraulic fluid and nitrogen.
What is the drag brace of landing gear?
A drag brace is used to restrain against the pivot action built into the trunnion attachment. The upper end of the two-piece drag brace is attached to the aircraft structure and the lower end to the strut. A hinge near the middle of the brace allows the brace to fold and permits the gear to retract.
What is a landing gear strut?
Landing Gear Struts: How They Work. Landing gear is an integral part of any aircraft, and perhaps the most important part of landing gear is the struts. The struts are the piece of equipment that bears the brunt of the force an aircraft experiences when it touches back down on ground after flight.