Text in force at CAR3R-8: from CAR3R-0, effective 15 May 1956. OCR text
(a) Oil tanks shall be vented to the engine crankcase from the top of the expansion space in such a manner that the vent connection is not covered by oil uider any normal flight conditions. Oil tank vents shall be so arranged that condensed water vapor which might freeze and obstruct the line cannot accumulate at any point.
(b) Category A. Provision shall be made to prevent hazardous loss of oil during acrobatic maneuvers including short periods of inverted flight.