---
title: "CS 25.391 Control surface loads: general — CS-25 · Avioverse"
description: "The control surfaces must be designed for the limit loads resulting from the flight conditions in CS 25.331, CS 25.341(a) and (b), CS 25.349 and CS…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-c/cs-25-391"
---

# CS 25.391 Control surface loads: general

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

IR Implementing rule

## CS 25.391 Control surface loads: general

The control surfaces must be designed for the limit loads resulting from the flight conditions in CS 25.331, CS 25.341(a) and (b), CS 25.349 and CS 25.351, considering the requirements for:

(a) Loads parallel to hinge line, in CS 25.393;

(b) Pilot effort effects, in CS 25.397;

(c) Trim tab effects, in CS 25.407;

(d) Unsymmetrical loads, in CS 25.427; and

(e) Auxiliary aerodynamic surfaces, in CS 25.445.

\[Amdt 25/1]

IR · CS 25.391 — CS-25 · ED Decision 2005/006/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.