Determine pressure altitude.

Determination should include the following:

• Pressure altitude is the altitude indicated when the altimeter setting window (barometric scale) is adjusted to 29.92 "Hg (inches of Mercury).
• This is the altitude above the standard datum plane, which is a theoretical plane where air pressure (corrected to 15 °C) equals 29.92 "Hg.
• Pressure altitude is used to compute density altitude, true altitude, TAS, and other performance data.

PLT019

Process/Skill Questions:

• Why is it important to be able to determine pressure altitude?
• What computations depend on pressure altitude?