---
title: "CS 25.363 Side load on engine and auxiliary power unit mounts — CS-25 · Avioverse"
description: "Each engine and auxiliary power unit mount and its supporting structure must be designed for a limit load factor in a lateral direction, for the side…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-c/cs-25-363"
---

# CS 25.363 Side load on engine and auxiliary power unit mounts

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

IR Implementing rule

## CS 25.363 Side load on engine and auxiliary power unit mounts

(a) Each engine and auxiliary power unit mount and its supporting structure must be designed for a limit load factor in a lateral direction, for the side load on the engine and auxiliary power unit mount, at least equal to the maximum load factor obtained in the yawing conditions but not less than –

(1) 1·33; or

(2) One-third of the limit load factor for flight condition A as prescribed in CS 25.333(b).

(b) The side load prescribed in sub-paragraph (a) of this paragraph may be assumed to be independent of other flight conditions.

IR · CS 25.363 — CS-25 · ED Decision 2003/2/RM · 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.