Oleo Strut Sag Check

A good question was posed to me yesterday about how to tell if your oleo strut is properly charged. We began installing oleos with the SR22T introduction with the SR20 and SR22's following shortly afteward. So they have been in production a few years now.

It is common for manufacturers to list an exposed amount of chrome to indicate a properly charged strut. This makes it easy for mechanics and pilots alike to be able to look at their airplane and know if the strut is charged.

For the Cirrus, this number is listed in the Aircraft Maintenance Manual (AMM) Chapter 32-20. For the SR22/22T shown below that measurement is 2.00-2.25". For the SR20 it is 2.25-2.5" due to the lower weight.

SR22/22T Oleo Strut Exposed Chrome Measurement for a Properly Charged Strut