---
title: "CS 25.817 Maximum number of seats abreast — CS-25 · Avioverse"
description: "On aeroplanes having only one passenger aisle, no more than 3 seats abreast may be placed on each side of the aisle in any one row."
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-d/cs-25-817"
---

# CS 25.817 Maximum number of seats abreast

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

IR Implementing rule

## CS 25.817 Maximum number of seats abreast

On aeroplanes having only one passenger aisle, no more than 3 seats abreast may be placed on each side of the aisle in any one row.

IR · CS 25.817 — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

[All rules in SUBPART D – DESIGN AND CONSTRUCTION](https://avioverse.aero/regulations/easa/cs-25/subpart-d)

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.