[bongodriver]

Originally Posted by SlipBall

No pressure system, Cherokee 140 PA-28-140 fixed gear, two seats designed for training.

OK that makes no sense then, or I believe people here are getting airfield elevation mixed up with QNH....not the same thing, QNH is the pressure setting you set on the altimeter so it reads your altitude above sea level, if you land on QNH then the altimeter will read something close to airfield elevation but not exact, a barometric altimeter is not so precise.
QFE is the pressure at airfield level, it will read close to 0feet +/- altimeter errors when on the airfiled and will give height above aerodrome when flying.
QNE is standard setting (1013) and the altimeter will read your flight level, given that pressure at the surface changes this could be a datum above or below mean sea level.