Advanced Ground Instructor Practice Exam 2025 – Complete Test Prep

Question: 1 / 400

How does increased altitude affect aircraft performance?

It generally increases thrust and lift

It reduces thrust, lift, and engine performance

Increased altitude typically results in a decrease in air density, which has a direct impact on aircraft performance. As an aircraft ascends to higher altitudes, both thrust and lift are affected negatively. Thrust is reduced because the engines rely on the density of the air to work efficiently; lower density means fewer air molecules to mix with fuel for combustion. Similarly, lift is diminished due to a decrease in air density, which means less lift is generated at a given airspeed.

In terms of engine performance, the conditions at higher altitudes can lead to an increased risk of engine stall, reduced cooling efficiency, and potential limitations in power output due to the lower availability of oxygen for combustion. Therefore, as altitude increases, pilots must be aware that both thrust and lift are likely to diminish, making option B the most accurate choice regarding the effects of altitude on aircraft performance.

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It enhances fuel efficiency

It has no effect on performance

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