---
title: "CS 25.1301 Function and installation — CS-25 · Avioverse"
description: "(See AMC 25.1301) (a) Each item of installed equipment must – (1) Be of a kind and design appropriate to its intended function;"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-f/cs-25-1301"
---

# CS 25.1301 Function and installation

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

IR Implementing rule

## CS 25.1301 Function and installation

(See AMC 25.1301)

(a) Each item of installed equipment must –

(1) Be of a kind and design appropriate to its intended function;

(2) Be labelled as to its identification, function, or operating limitations, or any applicable combination of these factors. (See AMC 25.1301(a)(2).)

(3) Be installed according to limitations specified for that equipment.

(b) Electrical wiring interconnection systems must meet the requirements of subpart H of this CS-25.

\[Amdt 25/2]

\[Amdt 25/5]

IR · CS 25.1301 — CS-25 · ED Decision 2008/006/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.1301(a)(2) Function and installation

When pipelines are marked for the purpose of distinguishing their functions, the markings should be such that the risk of confusion by maintenance or servicing personnel will be minimised. Distinction by means of colour markings alone is not acceptable. The use of alphabetic or numerical symbols will be acceptable if recognition depends upon reference to a master key and any relation between symbol and function is carefully avoided. Specification ISO.12 version 2ED 1987 gives acceptable graphical markings.

\[Amdt 25/5]

AMC · AMC 25.1301(a)(2) — CS-25 · ED Decision 2008/006/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

[All rules in SUBPART F – EQUIPMENT](https://avioverse.aero/regulations/easa/cs-25/subpart-f)

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.