aircraft systemsFAA-published question bank (Private Pilot, 2008)
The basic purpose of adjusting the fuel/air mixture at altitude is to
A
decrease the amount of fuel in the mixture in order to compensate for increased air density.
B
decrease the fuel flow in order to compensate for decreased air density.✓ Correct Answer
C
increase the amount of fuel in the mixture to compensate for the decrease in pressure and density of the air.
Explanation
As altitude increases the air becomes less dense, so the same fuel flow produces an overly rich mixture; PHAK says the mixture control is used to reduce fuel flow to match the decreased air density. Air density decreases with altitude, and adding fuel would make the mixture even richer.
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