Question

11. An airplane is operating from an airfield that has a barometric pressure of 27.82 in. Hg and a runway temperature of 100°F. Calculate (or find in Table 2.1) the following: a. Pressure ratio b. Pressure altitude c. Temperature ratio d. Density ratio e. Density altitude

Answer 1

a) Pressure ratio is 0.928

b) Pressure altitude is 2000 ft

c) Temperature ratio is 1.078

d) Density ratio is 0.8608

e) Density altitude is 5000 ft

Pressure ratio is the the ratio of ambient pressure to the sea level standard pressure measured in the same units.

• Ambient pressure = 27.82 inHg
• Sea level standard pressure = 29.92 inHg
• Pressure Ratio = 27.82/29.92 = 0.928

Pressure altitude or geopotential altitude at a point in the atmosphere is defined by the ambient pressure level according to the international standard atmosphere.

• The pressure height is therefore not determined by the altitude of the given point above sea level.
• For every decrease of 1 inHg in Sea level pressure there is increase in 1000 ft.
• Since ambient pressure is 2 inHg more than the sea level pressure, therefore pressure altitude will be 2000 ft.

Temperature is the ratio ambient temperature to the sea level temperature.

• Ambient temperature is 107.8°F
• Sea level temperature is 100°F
• Temperature ratio = 107.8/100 = 1.078

Density ratio is the ratio of pressure ratio to the temperature ratio

• Pressure Ratio = 0.928
• Temperature ratio =  1.078
• Density ratio = 0.928 /  1.078 = 0.8608

Density Altitude is the corrected pressure altitude for some specific non-standard temperatures.

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