struts
The landing gear oleo's are filled to 400 lb. AS far as the class being expensive you are right but I go back every couple of years just to see what is new and to keep up with the new models and with what has changed. I'm in a little different situation than most owners as to the cost because I'm not only an owner but an IA and make my living working on piston helicopters. A perfect example is the pressures, at one time it was 450 lb and at the last class I took in June it was 400lb. Remember that the struts also have 5606 oil in them and not just nitrogen ,they work like a damper and actually perform the same function. I hope this helps and if I can help in any way give me a call. BE SAFE and keep on flying. Bill Mott 570-729-7006