§23.1017 Oil lines and fittings.

(a) Oil lines. Oil lines must meet Sec. 23.993 and must accommodate a flow of oil at a rate and pressure adequate for proper engine functioning under any normal operating condition. (b) Breather lines. Breather lines must be arranged so that-- [(1) Condensed water vapor or oil that might freeze and obstruct the line cannot accumulate at any point;] (2) The breather discharge will not constitute a fire hazard if foaming occurs, or cause emitted oil to strike the pilot's windshield; (3) The breather does not discharge into the engine air induction system; and (4) For acrobatic category airplanes, there is no excessive loss of oil from the breather during acrobatic maneuvers, including short periods of inverted flight. [(5) The breather outlet is protected against blockage by ice or foreign matter.]