Quiz 2 Flashcards
absolute altitude
height above ground
AGL
indicated altitude
the altitude shown on the alitmeter
true altitude
the height above mean sea level
pressure altitude
the altitude read on altimeter when set to 29.92
density altitude
pressure altitude corrected for temperature
at a constant pressure - density is inversely proportional to
temperature
what is denser dry or moist air
dry air
does standard atmosphere presume there is moisture
no it assumes there is no moisture
what is (ISA) international standard atmosphere
it represents the atmosphere for purpose of pressure altimeter calibrations, aircraft performance, and aircraft design
what is ISA temp and pressure
15C
29.92
can altimetry deviate from reality
yes
what is virtual temperature
the temperature the air would have if all its water vapor were removed, and its density and pressure remained constant.
an aneroid barometer type altimeter
more rugged and portable than a scientific mercury barometer, but not quite as accurate
what is an altimeter setting
the station pressure (for elevation 10 feet above mean runway elevation) adjusted to sea level using ISA
source of altimeter arrors
Temperature - when it deviates from ISA - colder less than indicated - warmer - more than indicateed -
steep terrain - wind caused by mountain passes causes dynamic pressure drops
remote altimeter source - when altimer setting is set from more than 5 miles away from runway threshold increse 5 feet for each 5 mile
