Aircraft Performance Flashcards
STUDY THE FOLLOWING:
- Takeoff charts.
- Landing charts.
- Cruise charts.
- Crosswind charts.
…
What is pressure altitude?
What you get when you set 29.92 in the altimeter window, and read the indicated altitude.
It tells you what altitude you’d have to fly in a standard atmosphere to have the same air pressure.
When is pressure altitude equal to true altitude?
When standard atmospheric conditions exist.
What is density altitude?
Pressure altitude corrected for nonstandard temperature.
It’s a measure of how far apart the molecules of air are compared with standard temperature.
When are pressure altitude and density altitude the same?
At standard temperature.
What effect does increasing ambient temperature have on density altitude?
It increases it.
If the outside air temperature at a given altitude is warmer than standard, is the density altitude higher or lower than pressure altitude?
Higher.
What effect does high relative humidity have on density altitude?
It increases it.
Which three atmospheric conditions will reduce aircraft takeoff and climb performance?
High temperature, high relative humidity, and high density altitude.
What happens to propeller efficiency at high density altitude? Why?
The efficiency is reduced, because the propeller exerts less force than at lower density altitudes.
