---
title: "AMC 25J901(c)(4) Electrical Bonding — CS-25 · Avioverse"
description: "Where the APU is not in direct electrical contact with its mounting the engine should be electrically connected to the main earth system by at least two…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-j/amc-25j901-c-4-electrical-bonding"
---

# AMC 25J901(c)(4) Electrical Bonding

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

AMC Acceptable means of compliance

## AMC 25J901(c)(4) Electrical Bonding

Where the APU is not in direct electrical contact with its mounting the engine should be electrically connected to the main earth system by at least two removable primary conductors, one on each side of the APU.

\[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.