---
title: "CS 25J1521 APU limitations — CS-25 · Avioverse"
description: "The APU limitations must be established so that they do not exceed the corresponding approved limits for the APU and its systems."
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-j/cs-25j1521-apu-limitations"
---

# CS 25J1521 APU limitations

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

IR Implementing rule

## CS 25J1521 APU limitations

The APU limitations must be established so that they do not exceed the corresponding approved limits for the APU and its systems. The APU limitations, including categories of operation, must be specified as operating limitations for the aeroplane.

\[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.