aircraft systemsFAA-published question bank (Private Pilot, 2008)
For internal cooling, reciprocating aircraft engines are especially dependent on
A
a properly functioning thermostat.
B
air flowing over the exhaust manifold.
C
the circulation of lubricating oil.✓ Correct Answer
Explanation
PHAK Chapter 7 explains that in addition to lubricating, the circulating engine oil carries heat away from internal parts, so reciprocating engines depend heavily on it for internal cooling (air flowing over the cylinder fins cools the outside). Air-cooled aircraft engines have no coolant thermostat, and the exhaust manifold is a heat source, not a cooling path.
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