MILITARY CYPRES USER'S GUIDE
Airtec GmbH
Page 29
4.4.2.1 Example of altitude adjustment in aircraft
(Military CYPRES with absolute adjustment method)
Assume you are in a pressurised aircraft flying at an altitude of 20.000 feet (outside
air pressure approx. 466 hPa). The absolute air pressure inside the cabin is 898 hPa
(corresponds with approx. 3.300 feet ASL). The intended parachute landing point is at
an elevation of 10.000 feet (absolute air pressure 697 hPa).
For the altitude adjustment you require only the absolute air pressure value at the
landing point (697 hPa). The airpressure inside or outside the aircraft is irrelevant for
the adjustment.
697
898
466
697
697
898
20.000 ft
10.000 ft
3.300 ft
0 ft
