Matthew S. Whiting wrote:

You are flying a Cessna Skylane with the air intake under the spinner.
Heavy snow can clog it requiring you to fly with carb heat applied
causing a measurable loss of manifold pressure.

The later model C172s and 182s have an automatic alternate air feature
that will pull air from within the engine cavity if the air intake below
the spinner clogs up.

The pilot can expect a drop in RPMs of about 10% if this occurs.

--
Peter










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