---
title: "CS 25.399 Dual control system — CS-25 · Avioverse"
description: "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…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-c/cs-25-399"
---

# CS 25.399 Dual control system

Large Aeroplanes (CS-25) · CS-25 · EAR revision 26 Jan 2023

IR Implementing rule

## CS 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 CS 25.395; or

(2) The minimum forces specified in CS 25.397(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 CS 25.395.

\[Amdt 25/2]

IR · CS 25.399 — CS-25 · ED Decision 2006/005/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

[All rules in SUBPART C – STRUCTURE](https://avioverse.aero/regulations/easa/cs-25/subpart-c)

Consolidated from the EASA Easy Access Rules (revision 26 Jan 2023, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.