Oleo Strut Pressure

[Robert Peacher]

The normal strut pressure on our nose strut is 300 psi while it is on jacks. We also have a chart that shows the pressure vs strut extension for servicing while the plane is on the ground. If I increase the weight of the aircraft and raise the on-jack pressure to 350 psi, will the current chart still be applicable or will there need to be a new chart made? Thanks for your help!

 

[rb1957]

is 350psi within the Oleo's OEM's permitted range?

I'd expect a new chart (pressure vs extension) is required.

another day in paradise, or is paradise one day closer ?

 

[Robert Peacher]

Yes. Our tech data tells us to increase the pressure to 350 psi for this particular situation. The question came up as to whether we can use the chart that is used for normal servicing or if a new chart would be needed because of the no-load pressure difference.

 

[rb1957]

You could possibly get lucky and maybe the force to create a displacement "x" is 7/6*the force at 300psi.

It might depend on how linear the original load/deflection curve is.

another day in paradise, or is paradise one day closer ?

 

[Robert Peacher]

I've attached the chart we are using. Again, this is used for servicing to the equivalent of 300 psi with no load.

 

[Robert Peacher]

Apparently that didn't work, so, I'm trying again.

 

[rb1957]

so the oleo's bottomed out ?

since 350psi is on the chart, why ask the question ?

what are you doing with the oleo ? the chart looks like it's to verify the pressure ... the extension should be x inches if the oleo pressure is y psi (and you can measure oleo pressure with a pressure gauge too, no?

I thought your chart was a measure of load vs deflection for a given pressure.


another day in paradise, or is paradise one day closer ?