14 CFR 121.243
§ 121.243 Engine breather lines.
United States · 14 CFR — Aeronautics and Space · Status: effective
Cite this
- Citation
- 14 CFR 121.243, § 121.243 Engine breather lines, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/56689
- Permanent ID
ys:prov:56689@1- SHA-256
fe4c4d060beeea8a0536addf39298fe6b7902cd8d9f7de3bf5e8a5996da14f8e
The hash is SHA-256 of this version's text, with every run of whitespace collapsed to a single space and the ends trimmed. The ID always leads back here, and checking it says whether the text you cited is still the current version.
Full text
(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.
(c) Engine breathers may not discharge into the engine air induction system.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.