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Private Pilot Airplane practice question 35

If an aircraft is equipped with a fixed-pitch propeller and a float-type carburetor, the first indication of carburetor ice would most likely be

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Correct answer: C. loss of RPM.

With a fixed-pitch propeller, the first sign of carburetor ice is usually a loss of RPM, which may be followed by engine roughness.

References

Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), ch. 7, Aircraft Systems · search it in our library

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Question 35 from the FAA document Private Pilot-Airplane (PAR) Sample Questions (U.S. Government work, public domain) · ACS/LSC code PA.IX.C.K1b. The FAA does not publish an answer key; the answer and explanation are ours, with references. Verify against the current regulations and handbooks.