Readers ask: How Do Aviation Struts Work?

What are aircraft struts?

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.

How are the struts secured?

During installation, insert the upper mounting studs through the holes in the strut tower. Loosely install one mounting plate nut. Make sure you have at least three to six full threads engaged. Do not install the other mounting nuts until the lower mount is in position and secure.

How does an aircraft oleo strut work?

Oleo struts absorb and dissipate shock loads using a combination of two fluids — a gas and a hydraulic fluid — contained in two chambers — a cylinder and a piston. 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.

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What point in the stroke should the strut be during servicing?

In a properly serviced strut, the extension stroke of the shock strut operation occurs at the end of the compression stroke.

How long do struts last?

On average, if your car has been “babied,” you can expect your shocks/ struts to last about 10 years. If you have really used your car like a workhorse, 5 years is probably all you can expect. This means that for the average driver, 7 or 8 years is the maximum life expectancy of most shocks and struts.

How much do struts cost?

The average cost for a strut replacement generally runs between $450 and $900 to replace a pair. If you are just replacing a single strut, the repair price will come to between $130 and $300, while labor will cost you between $150 and $300 for the pair.

Do I need an alignment after replacing struts?

Replacing those struts requires no alignment.

Can I replace struts myself?

Strut Replacement Replacing struts used to be a dangerous job for a DIYer. These assemblies allow you to replace both of your front struts yourself in less than two hours. You’ll have to get an alignment done afterward (about $100), but you’ll still save about $300 by doing the job yourself.

What noise does a bad strut make?

Knocking noises when driving over bumps When compressed, the knocking sound that is often heard is caused by the strut “bottoming out” or metal-to-metal contact. If you notice a knocking or clunking sound coming from an area near the front or rear tires, it’s most likely due to worn out or broken struts.

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How much oil should be put into an oleo shock strut?


Question Answer
What takes up the taxi shocks in an oleo shock strut? Compressed air.
How much oil should be put into an oleo shock strut? Deflate the strut completely, remove the filler plug and fill the strut with oil to the level of the filler plug.


Which type of landing gear is most commonly used today?

Arguably the most common type of landing gear,tricycle-type gear includes the main gear and the nose gear. It’s typically used on both large and light aircraft. With this design, the two main wheels are attached to the airframe behind the center of gravity.

What type of oil is used in an oleo strut?

Generally Boeing struts use military hydraulic fluid (red oil ) MIL-H-5606 and dry nitrogen as the charge. Many military aircraft have upgraded to synthetic hydraulic fluids that are fully compatible with MIL-H-5606, like MIL-PRF-83282 or MIL-PRF-87257.

What should be checked when a shock strut bottoms out?

the aircraft service manual. 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.

What is a shock and what is a strut?

The primary difference between a strut and shock is in the design of the individual suspension system. Struts are used on vehicles without an upper control arm and connect to the knuckle while vehicles with an upper and lower control arm (independent suspension) or a solid axle (on the rear) use shock absorbers.

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