---
title: "AMC 25J943 APU Operating Characteristics — CS-25 · Avioverse"
description: "1 Compliance with CS 25J943 should be shown by design analysis and flight tests."
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-j/amc-25j943-apu-operating-characteristics"
---

# AMC 25J943 APU Operating Characteristics

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

AMC Acceptable means of compliance

## AMC 25J943 APU Operating Characteristics

1 Compliance with CS 25J943 should be shown by design analysis and flight tests. The flight tests should include manoeuvre in which less than zero 'g' occurs for one continuous period of at least 5 seconds and a further manoeuvre with two periods of less than zero 'g' with a total time for these two periods of at least 5 seconds.

2 In the case of non-essential APUs, inadvertent shut-down due to negative accelerations is acceptable.

\[Amdt 25/1]

AMC — 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.