RE: Air pressure for retracts
I usually pump my system up to 100-110 pounds. This seems to be a very common practice among the jet pilots. With this kind of pressure, if you were to forget to air up the retracts for the next flight, you just might have enough pressure left over to cycle the gear again and prevent damage to the airframe. 40 pounds works in most instances and 60 pounds works even better. I just don't like the idea of only having a minimum required amount of air pressure onboard.