Code of Federal Regulations

Title 14 - Aeronautics and Space
Volume: 1Date: 2023-01-01Original Date: 2023-01-01Title: Section 27.653 - Pressure venting and drainage of rotor blades.Context: Title 14 - Aeronautics and Space. CHAPTER I - FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION. SUBCHAPTER C - AIRCRAFT. PART 27 - AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT. Subpart D - Design and Construction. - Rotors.
§ 27.653 Pressure venting and drainage of rotor blades. (a) For each rotor blade—
Code of Federal Regulations / Title 14 - Aeronautics and Space / Vol. 1 / 2023-01-01514
(1) There must be means for venting the internal pressure of the blade; (2) Drainage holes must be provided for the blade; and (3) The blade must be designed to prevent water from becoming trapped in it. (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. [Amdt. 27–2, 33 FR 963, Jan. 26, 1968]