5.1 density altitude Flashcards
what are the standard temperature and pressure values for sea level
15° C and 29.92” Hg
what effect, if any does high humidity have on aircraft performance
it decreases performance
which factor would tend to increase the density altitude at a given airport
an increase in ambient temperature
what effect does high density altitude, as compared to low density altitude, have on propeller efficiency and why
efficiency is reduced because the propeller exerts less force at high density altitudes than at low density altitudes
what effect does high density altitude have on aircraft performance
it reduces climb performance
which combination of atmospheric conditions will reduce aircraft takeoff and climb performance
high temperature, high relative humidity, and high density altitude
as air temperature increases, density altitude will
increase
you have planned a cross-country flight on a warm spring morning. Your course includes a mountain pass, which is at 11,500 ft MSL. The service ceiling of your airplane is 14,000 ft MSL. After checking the local weather report, you are able to calculate the density altitude of the mountain pass as 14,800 ft MSL. Which of the following is the correct action to take?
replan your journey to avoid the mountain pass
A pilot and 2 passengers landed on a 2,100 foot east-west gravel strip with an elevation of 1,800 ft. The temperature is warmer than expected and after computing the density altitude it is determined the takeoff distance over a 50 foot obstacle is 1,980 ft. The airplane is 75 pounds under gross weight. What would be the best choice?
wait until the temperature decreases, and recalculate the takeoff performance
if the outside air temperature (OAT) at a given altitude is warmer than standard, the density altitude is
high than pressure altitude
