Text in force at CAR3-14: from CAR3-0, effective 1 Nov 1949. OCR text
(a) The engine air induction system shall permit supplying an adequate quantity of air to the engine under all conditions of operation.
(b) Each engine shall be provided with at least two separate air intake sources, except that in the case of an engine equipped with a fuel injector only one air intake source need be provided, if the air intake, opening, or passage is unobstructed by a screen, filter, or other part on which ice might form and so restrict the air flow as to affect adversely engine operation. Primary and alternate air intakes may open within the cowling only if that portion of the cowling is isolated from the engine accessory section by means of a fireproof diaphragm. Alternate air intakes shall be located in a sheltered position. Supplying air to the engine through the alternate air intake system or the carburetor air preheater shall not result in the loss of excessive power in addition to the power lost due to the rise in the temperature of the air.