---
title: "CS 25J943 Negative acceleration — CS-25 · Avioverse"
description: "No hazardous malfunction of an APU or any component or system associated with the APU may occur when the aeroplane is operated at the negative…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-j/cs-25j943-negative-acceleration"
---

# CS 25J943 Negative acceleration

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

IR Implementing rule

## CS 25J943 Negative acceleration

No hazardous malfunction of an APU or any component or system associated with the APU may occur when the aeroplane is operated at the negative accelerations within the flight envelopes prescribed in CS 25.333. This must be shown for the greatest duration expected for the acceleration.

\[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.