During the run-up at a high-elevation airport, a pilot notes a slight engine roughness that is not affected by the magneto check but grows worse during the carburetor heat check. Under these circumstances, what would be the most logical initial action?

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If a pilot changes the altimeter setting from 30.11 to 29.96, what is the approximate change in indication?

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Should it become necessary to handprop an airplane engine, it is extremely important that a competent pilot

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What is an important airspeed limitation that is not color coded on airspeed indicators?

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