density Altitude Flashcards
(25 cards)
What is density altitude?
Density altitude is the altitude at which the air density is equal to the standard atmospheric density at sea level.
True or False: Higher temperatures result in higher density altitudes.
True
Fill in the blank: Density altitude increases with __________.
temperature
What is the relationship between pressure altitude and density altitude?
Density altitude is calculated by adjusting pressure altitude for temperature deviations from standard.
How does humidity affect density altitude?
Higher humidity decreases air density, resulting in a higher density altitude.
What is the standard temperature lapse rate in the troposphere?
The standard temperature lapse rate is approximately 2 degrees Celsius per 1,000 feet.
Multiple Choice: Which of the following factors does NOT affect density altitude? A) Temperature B) Pressure C) Wind D) Humidity
C) Wind
What is the formula to calculate density altitude?
Density Altitude = Pressure Altitude + (120 × (OAT - Standard Temperature))
True or False: Density altitude is critical for aircraft performance.
True
Fill in the blank: As altitude increases, the air becomes __________.
less dense
What effect does a high density altitude have on an aircraft’s takeoff performance?
It requires a longer takeoff distance and may reduce climb performance.
What is the significance of the ‘density altitude chart’?
It helps pilots determine the density altitude for various temperatures and pressures.
Multiple Choice: At what density altitude does an aircraft typically experience reduced performance? A) 1,000 feet B) 5,000 feet C) 10,000 feet D) All of the above
D) All of the above
What is the standard sea level pressure in inches of mercury?
29.92 inches of mercury
How can pilots mitigate the effects of high density altitude?
By planning for longer takeoff distances, reducing weight, and choosing cooler times of day for flight.
True or False: Density altitude is only a concern at high elevations.
False
What is the impact of a temperature inversion on density altitude?
It can lead to higher density altitudes, worsening aircraft performance.
Fill in the blank: The higher the density altitude, the __________ the engine performance.
lower
What instrument measures pressure altitude?
The altimeter
Multiple Choice: Which of the following conditions will result in the highest density altitude? A) 30°C at sea level B) 20°C at 5,000 feet C) 40°C at 10,000 feet D) 0°C at sea level
C) 40°C at 10,000 feet
What is the effect of taking off at high density altitude on an aircraft’s climb rate?
The climb rate is generally reduced.
True or False: Density altitude can be calculated using a flight computer.
True
What role does the local airport elevation play in determining density altitude?
It serves as the baseline pressure altitude for calculations.
Fill in the blank: To calculate density altitude, you need the pressure altitude and the __________.
outside air temperature (OAT)
