Code of Federal Regulations

Title 14 - Aeronautics and Space
Volume: 3Date: 2020-01-01Original Date: 2020-01-01Title: Section § 121.243 - Engine breather lines.Context: Title 14 - Aeronautics and Space. CHAPTER I - FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED). SUBCHAPTER G - AIR CARRIERS AND OPERATORS FOR COMPENSATION OR HIRE: CERTIFICATION AND OPERATIONS. PART 121 - OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS. Subpart J - Special Airworthiness Requirements.
§ 121.243 Engine breather lines. (a) Engine breather lines must be so arranged that condensed water vapor that may freeze and obstruct the line cannot accumulate at any point. (b) Engine breathers must discharge in a location that does not constitute a fire hazard in case foaming occurs and so that oil emitted from the line does not impinge upon the pilots' windshield.
Code of Federal Regulations / Title 14 - Aeronautics and Space / Vol. 3 / 2020-01-0198
(c) Engine breathers may not discharge into the engine air induction system.