---
title: "ETSO-2C122 — CS-ETSO · Avioverse"
description: "Devices That Prevent Blocked Channels Used in Two-Way Radio Communications Due to Simultaneous Transmissions 1 Applicability This ETSO gives the…"
url: "https://avioverse.aero/regulations/easa/cs-etso/subpart-b/etso-2c122"
---

# ETSO-2C122

European Technical Standard Orders (CS-ETSO) · CS-ETSO · EAR revision 1 Oct 2026

IR Implementing rule

## ETSO-2C122

Devices That Prevent Blocked Channels Used in Two-Way Radio Communications Due to Simultaneous Transmissions 1 Applicability

This ETSO gives the requirements which devices that prevent blocked channels used in two-way radio communications due to simultaneous transmissions, that are manufactured on or after the date of this ETSO must meet, in order to be identified with the applicable ETSO marking.

2 Procedures

2.1 General

Applicable procedures are detailed in CS-ETSO Subpart A.

2.2 Specific

None.

3 Technical Conditions

3.1 Basic

3.1.1 Minimum Performance Standard

Standards set forth in the EUROCAE document ED-68, „MOPS for Devices that prevent Simultaneous Transmissions“, dated April 1992.

3.1.2 Environmental Standard

See CS-ETSO Subpart A paragraph 2.1

3.1.3 Computer Software

See CS-ETSO Subpart A paragraph 2.2

3.2 Specific

None

4 Marking

4.1 General

Marking is detailed in CS-ETSO Subpart A.

4.2 Specific

None.

5 Availability of Referenced Document

See CS-ETSO Subpart A paragraph 3

IR · ETSO-2C122 — CS-ETSO · ED Decision 2003/10/RM · CS-ETSO Easy Access Rules · EAR revision 1 Oct 2026

[All rules in SUBPART B – LIST OF ETSOs](https://avioverse.aero/regulations/easa/cs-etso/subpart-b)

Consolidated from the EASA Easy Access Rules (revision 1 Oct 2026, 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.