---
title: "CS 25J1163 APU accessories — CS-25 · Avioverse"
description: "APU mounted accessories must be approved for installation on the APU concerned and use the provisions of the APU for mounting."
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-j/cs-25j1163-apu-accessories"
---

# CS 25J1163 APU accessories

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

Official sources: [EASA Easy Access Rules (opens in a new tab)](https://www.easa.europa.eu/en/document-library/easy-access-rules/easy-access-rules-large-aeroplanes-cs-25)

IR Implementing rule

## CS 25J1163 APU accessories

(a) APU mounted accessories must be approved for installation on the APU concerned and use the provisions of the APU for mounting.

(b) Electrical equipment subject to arcing or sparking must be installed to minimise the probability of contact with any flammable fluids or vapours that might be present in a free state.

(c) For essential APUs:

If continued rotation of a failed aeroplane accessory driven by the APU affects the safe operation of the aeroplane, there must be means to prevent rotation without interfering with the continued operation of the APU.

\[Amdt 25/1]

IR — CS-25 · ED Decision 2005/006/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

[All rules in SUBPART J – AUXILIARY POWER UNIT INSTALLATIONS](https://avioverse.aero/regulations/easa/cs-25/subpart-j)

Consolidated from the EASA Easy Access Rules (revision 26 Jan 2023, extracted 2 Nov 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.