---
title: "AMC E 10(b) Thrust Reversers — CS-E · Avioverse"
description: "If a thrust reverser is declared as being part of the Engine type design under CS-E 20(a), it should comply with all appropriate CS-E specifications and…"
url: "https://avioverse.aero/regulations/easa/cs-e/subpart-a/amc-e-10-b-thrust-reversers"
---

# AMC E 10(b) Thrust Reversers

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

AMC Acceptable means of compliance

## AMC E 10(b) Thrust Reversers

If a thrust reverser is declared as being part of the Engine type design under CS-E 20(a), it should comply with all appropriate CS-E specifications and therefore be certificated as part of the Engine. However, the thrust reverser itself is, in addition, required to comply with the relevant aircraft specifications during the certification of the aircraft.

The intent of CS-E specifications is to give sufficient confidence that the use of the thrust reverser, where this is permitted, has no detrimental effects on the Engine itself, such as flutter in a fan, excessive vibrations or loads induced in the Engine carcass, etc.

This is addressed mainly under CS-E 500, CS-E 650, and CS-E 890.

If the Engine is intended to be used with a thrust reverser which is not included in the Engine type design, these CS-E specifications should nevertheless be addressed for approval of the use of the Engine with this thrust reverser. If this is not done, then the Engine certification documentation is endorsed so that the use of the thrust reverser is prohibited.

If CS-E is complied with by the Engine / thrust reverser combination, the Engine data sheet would contain a note to the effect that the Engine may be used with the specified thrust reverser.

(a) If a thrust reverser is declared as being part of the Engine type design under CS-E 20(a), it must comply with all appropriate CS-E specifications and therefore be certificated as part of the Engine.

(b) If the Engine is intended to be used with a thrust reverser which is not included in the Engine type design, these CS-E specifications must nevertheless be addressed for the approval of the use of the Engine with a thrust reverser. The thrust reverser definition must then be included in the Manuals required by CS-E 20(d). This may be a reference to the specific thrust reverser of the intended installation, or this may be limited to defining the key design characteristics that must be respected, including, but not limited to, mass, centre of gravity, aerodynamic flow lines and nozzle areas. In this case, the Engine data sheet would contain a note to the effect that the Engine may be used with the specified thrust reverser.

(c) If the engine is not intended to be used with a thrust reverser, then the Engine data sheet indicates that the use of a thrust reverser is prohibited.

(d) Whilst compliance with CS-E may rely solely on testing using a duct equivalent to a production thrust reverser, the compliance with applicable aircraft certification specifications (e.g. CS 25.934) typically requires testing of the actual Engine / thrust reverser combination.

\[Amdt. No.: E/1]

AMC — CS-E · ED Decision 2007/015/R · CS-E Easy Access Rules · EAR revision 7 Dec 2023

[All rules in SUBPART A – GENERAL](https://avioverse.aero/regulations/easa/cs-e/subpart-a)

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.