What is meant by "pressure altitude"?

What is meant by "pressure altitude"?

• A. The altitude of the aircraft measured in feet
• B. The height at which atmospheric pressure equals 29.92 inches of mercury
• C. The altitude during takeoff only
• D. The height of a cloud base above ground level

Answer: (B)

Pressure altitude is defined as the height at which the atmospheric pressure is equal to the standard pressure of 29.92 inches of mercury (Hg). This concept is based on the International Standard Atmosphere (ISA), where pressure decreases with an increase in altitude. Thus, when pilots and air traffic control refer to pressure altitude, they are using a standardized measure that allows consistent communication and calculations necessary for flight operations. This measurement is particularly important for aircraft performance, as it provides a reference point that pilots can use to ensure safe and efficient flying. By adjusting the altimeter to the standard pressure setting, pilots can determine their altitude relative to this baseline, enabling them to make accurate decisions regarding altitude while in flight. Using pressure altitude is crucial for various calculations, including those involving climb and descent performance, as well as fuel consumption. It is also essential during takeoff and landing phases, especially when operating in areas where weather might significantly affect atmospheric pressure.

Pressure altitude is defined as the height at which the atmospheric pressure is equal to the standard pressure of 29.92 inches of mercury (Hg). This concept is based on the International Standard Atmosphere (ISA), where pressure decreases with an increase in altitude. Thus, when pilots and air traffic control refer to pressure altitude, they are using a standardized measure that allows consistent communication and calculations necessary for flight operations.

This measurement is particularly important for aircraft performance, as it provides a reference point that pilots can use to ensure safe and efficient flying. By adjusting the altimeter to the standard pressure setting, pilots can determine their altitude relative to this baseline, enabling them to make accurate decisions regarding altitude while in flight.

Using pressure altitude is crucial for various calculations, including those involving climb and descent performance, as well as fuel consumption. It is also essential during takeoff and landing phases, especially when operating in areas where weather might significantly affect atmospheric pressure.