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Private Pilot Airplane practice question 44

(Refer to FAA-CT-8080-2H, Figure 8.) What is the effect of a temperature increase from 35 to 50°F on the density altitude if the pressure altitude remains at 3,000 feet MSL?

FAA-CT-8080-2H, Figure 8. Density Altitude Chart. U.S. Government work (public domain). Source PDF. Tap to enlarge.

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Correct answer: A. 1,000-foot increase.

Density altitude rises about 120 feet for each 1 °C of warming. 35 °F is about 1.7 °C and 50 °F is about 10 °C, a rise of about 8.3 °C, so density altitude increases by about 1,000 feet, matching the chart.

References

Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), p. 4-4, Principles of Flight · search it in our library

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Question 44 from the FAA document Private Pilot-Airplane (PAR) Sample Questions (U.S. Government work, public domain) · ACS/LSC code PA.I.F.K2a. The FAA does not publish an answer key; the answer and explanation are ours, with references. Verify against the current regulations and handbooks.