---
kind: "section"
citation: "14 C.F.R. § 25.399"
title: "14"
number: "25.399"
heading: "Dual control system."
url: "https://uscodex.org/cfr/14/25.399"
---

# §25.399. Dual control system.

- (a) Each dual control system must be designed for the pilots operating in opposition, using individual pilot forces not less than—
  - (1) 0.75 times those obtained under [§ 25.395](/cfr/14/25.395.md); or
  - (2) The minimum forces specified in [§ 25.397(c)](/cfr/14/25.397.md?p=c).
- (b) The control system must be designed for pilot forces applied in the same direction, using individual pilot forces not less than 0.75 times those obtained under [§ 25.395](/cfr/14/25.395.md).

## Notes

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701, 44702 and 44704; Pub. L. 115-254, 132 Stat 3281 (49 U.S.C. 44903 note).

### Source

Source: Docket No. 5066, 29 FR 18291, Dec. 24, 1964, unless otherwise noted.