StacksVerified U.S. regulatory reference

14 CFR §29.653

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)For each rotor blade—
    1. (1)There must be means for venting the internal pressure of the blade;
    2. (2)Drainage holes must be provided for the blade; and
    3. (3)The blade must be designed to prevent water from becoming trapped in it.
  2. (b)Paragraphs (a)(1) and (2) of this section does not apply to sealed rotor blades capable of withstanding the maximum pressure differentials expected in service.