Regulations last checked for updates: Feb 06, 2026

Title 14 - Aeronautics and Space last revised: Dec 19, 2026
All TitlesTitle 14Chapter IPart 33Subpart B - Subpart B—Design and Construction; General
View all text of Subpart B [§ 33.11 - § 33.29]
§ 33.21 - Engine cooling.

Engine design and construction must provide the necessary cooling under conditions in which the airplane is expected to operate.

authority: 49 U.S.C. 106(g), 40113, 44701, 44702, 44704
source: Docket No. 3025, 29 FR 7453, June 10, 1964, unless otherwise noted.
cite as: 14 CFR 33.21
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