---
title: "CS 25J1021 Oil system drains — CS-25 · Avioverse"
description: "A drain (or drains) must be provided to allow safe drainage of the oil system."
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-j/cs-25j1021-oil-system-drains"
---

# CS 25J1021 Oil system drains

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

Official sources: [EASA Easy Access Rules (opens in a new tab)](https://www.easa.europa.eu/en/document-library/easy-access-rules/easy-access-rules-large-aeroplanes-cs-25)

IR Implementing rule

## CS 25J1021 Oil system drains

A drain (or drains) must be provided to allow safe drainage of the oil system. Each drain must:

(a) Be accessible; and

(b) Have manual or automatic means for positive locking in the closed position.

\[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 2 Nov 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.