---
title: "CS-E 450 Ignition Tests — CS-E · Avioverse"
description: "For spark-ignition Engines: If the design of the ignition system includes redundancy, the reduction in Engine power resulting from loss of redundancy…"
url: "https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-450-ignition-tests"
---

# CS-E 450 Ignition Tests

Engines (CS-E) · CS-E · EAR revision 7 Dec 2023

IR Implementing rule

## CS-E 450 Ignition Tests

For spark-ignition Engines:

(a) If the design of the ignition system includes redundancy, the reduction in Engine power resulting from loss of redundancy shall be established. Tests shall be carried out with the Engine running at Take-off power setting at the beginning and at the end of each part of the endurance test of CS-E 440.

(b) In no case shall the reduction in power during the test exceed the value declared under CS-E 240(b)(1).

IR — CS-E · ED Decision 2003/9/RM · CS-E Easy Access Rules · EAR revision 7 Dec 2023

[All rules in SUBPART C — PISTON ENGINES, TYPE SUBSTANTIATION](https://avioverse.aero/regulations/easa/cs-e/subpart-c)

Consolidated from the EASA Easy Access Rules (revision 7 Dec 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.