Aircraft Airplane
Posted in Aircraft Model by admin
on February 12, 2008
How do aircraft know at what altitude they are flying?
When an airplane (or any sort of motorized aircraft, for that matter) is flying, they have a gage that tells them the altitude they are at, and if they are losing or gaining altitude. It also flashes an emergency light if they are losing altitude too fast. How does the plane's systems know?
It is all based on the principle that air pressure decreases with increasing altitude. A standard aircraft altimeter consists of a collapsible evacuated metal box, linked by gears to a set of pointers which show the altitude in feet. As the pressure changes, the box changes its size, changing the reading on the dials.
Another instrument is the vertical speed indicator. This works similarly, but has a small hole separating two parts of the device. If the aircraft is ascending, the pressure in the chamber connected to the outside will be less than the pressure in the chamber on the other side of the hole, and pressure difference will be displayed by an indicator on the face of the instrument.
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