---
title: "CS 25J953 Fuel system independence — CS-25 · Avioverse"
description: "Each fuel system must allow the supply of fuel to the APU: Through a system independent of each part of the system supplying fuel to the main engines;"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-j/cs-25j953-fuel-system-independence"
---

# CS 25J953 Fuel system independence

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

IR Implementing rule

## CS 25J953 Fuel system independence

Each fuel system must allow the supply of fuel to the APU:

(a) Through a system independent of each part of the system supplying fuel to the main engines; or

(b) From the fuel supply to the main engine if provision is made for a shut-off means to isolate the APU fuel line.

\[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 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.