---
kind: "section"
citation: "14 C.F.R. § 27.653"
title: "14"
number: "27.653"
heading: "Pressure venting and drainage of rotor blades."
url: "https://uscodex.org/cfr/14/27.653"
---

# §27.653. Pressure venting and drainage of rotor blades.

- (a) **For each rotor blade—**
  - (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)](#a-1) and [(2)](#a-2) of this section does not apply to sealed rotor blades capable of withstanding the maximum pressure differentials expected in service.

## Notes

### Amendments

[Amdt. 27-2, 33 FR 963, Jan. 26, 1968]

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701-44702, 44704.

### Source

Source: Docket No. 5074, 29 FR 15695, Nov. 24, 1964, unless otherwise noted.

### Amendments

[Amdt. 27-2, 33 FR 963, Jan. 26, 1968]