Aircraft General Knowledge
Altimeter ď ś Operations o
The altimeter is a barometer. The barometric pressure decreases with increasing altitude. A barometric capsule expands or contracts with altitude changes; the connected needles indicate the altitude. In general feet are indicated. A window calibrated in Hectopascal or inch/Hg shows the altimeter setting according to the QNH, QFE or pressure altitude. (one Hectopascal corresponds to 28 feet of altitude in standard atmosphere).
ď ś Errors o
With a non standard temperature, altitude indication changes. Temperatures below standard temperature cause a higher altitude indication (see altimetry).
PPL GROUND SCHOOL
AERO-SPORT - LFTA LUXEMBOURG / Reinhard Krommes / 12/10/2011 Slide: 48