I'm a mechanical engineer. I am currently working in the aerospace industry on pneumatic controls (valves used to control aircraft engines/APUs and the environment control systems). Right now, I'm working as a project engineer for fielded products; therefore, I work with the OEMs and operators to help eliminate problems with products that are currently in service, and I also answer questions that customers have.
Cool!
My Marine Corps MOS (Got out in may this year)was aircraft intermediate level hydraulics/pneumatics mechanic (we just worked on components). We would rebuild and test those very things you work on. They were definately more reliable than hyd components (didnt see many pneumatics other than accumulators which were half hyd). I think nitrogen not suspending contaminants probably had something to do with it If I recall the biggest problem was seating surfaces getting worn or corroding from moisture that somehow got in. I also remember solenoid valves just getting jammed from wear.
It was fun testing things with nitrogen since you always wondered if it would explode and kill you that day.
Anyway, just thought I would share. What aircraft are your components on out of curiosity?