---
title: "CS 25J1527 Ambient air temperature and operating altitude — CS-25 · Avioverse"
description: "The extremes of the ambient air temperature and operating altitude for which operation is allowed, as limited by flight, structural, APU installation…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-j/cs-25j1527-ambient-air-temperature-and-operating-altitude"
---

# CS 25J1527 Ambient air temperature and operating altitude

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

IR Implementing rule

## CS 25J1527 Ambient air temperature and operating altitude

The extremes of the ambient air temperature and operating altitude for which operation is allowed, as limited by flight, structural, APU installation, functional, or equipment characteristics, must be established.

\[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.