How can you determine pressure altitude without setting the altimeter?
First, pressure altitude is used as an indicator for atmospheric pressure. As you probably know this and temp are used to calculate aircraft performance. If you want to know the pressure altitude without being in the plane or you just don’t want to set it in the Kollsman window,then do the following: 1. Request the local barometric altimeter setting, let’s say it’s 28.00 “Hg. 2. Take 29.92 “Hg (standard atmosphere) and substract minus the 28.00″Hg. (29.92″Hg-28.00″Hg=1.92″Hg) 3. 1.92″Hg is the difference in pressure. 4. Take into account that each inch is worth 1000 ft. 5. Multiply 1.92″Hg X 1,000= 1,920 ft 6. The barometric setting (28.00) was less then 29.92, so we substract (we’d add if it was greater)1,920 from the present altitude of the aircraft. 7. Let’s say we’re at 10,000 ft;10,000-1,920=8,080 ft 8. 8,080 is your pressure altitude!!! But what does this mean?? It means that on a standard day (15C-29.92 “Hg pres), you being at 10,000, really feels like 8,080 to the aircraft in r
