---
title: "CS 23.2520 High-intensity radiated fields (HIRF) protection — CS-23 · Avioverse"
description: "Each electrical and electronic system that perform a function, the failure of which would prevent the continued safe flight and landing of the aeroplane…"
url: "https://avioverse.aero/regulations/easa/cs-23/subpart-f/cs-23-2520"
---

# CS 23.2520 High-intensity radiated fields (HIRF) protection

Normal-Category Aeroplanes (CS-23) · CS-23 · EAR revision 13 May 2026

IR Implementing rule

## CS 23.2520 High-intensity radiated fields (HIRF) protection

(a) Each electrical and electronic system that perform a function, the failure of which would prevent the continued safe flight and landing of the aeroplane, must be designed and installed such that:

(1) the function at the aeroplane level is not adversely affected during and after the time the aeroplane is exposed to the HIRF environment; and

(2) the system recovers normal operation of that function in a timely manner after the aeroplane is exposed to the HIRF environment, unless the system’s recovery conflicts with other operational or functional requirements of the system.

(b) For aeroplanes approved for instrument flight rules (IFR) operations, each electrical and electronic system that performs a function, the failure of which would reduce the capability of the aeroplane or the ability of the flight crew to respond to an adverse operating condition, must be designed and installed such that the system recovers normal operation of that function in a timely manner after the aeroplane is exposed to the HIRF environment.

IR · CS 23.2520 — CS-23 · ED Decision 2017/013/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

AMC Acceptable means of compliance

## AMC1 23.2520 High-intensity radiated fields (HIRF) protection

ASTM F44 F3264 Standard Specification for Normal Category Aeroplanes Certification

9.5 High-Intensity Radiated Fields (HIRF) Protection

F3061/F3061M-24a Standard Specification for Systems and Equipment in Small Aircraft F3236-21a Standard Specification for High Intensity Radiated Field (HIRF) Protection in Small Aircraft F3367-23 Standard Practice for Simplified Methods for Addressing High Intensity Radiated Fields (HIRF) and Indirect Effects of Lightning on Aircraft \[AMC & GM to CS-23: Issue 4]

\[AMC & GM to CS-23: Issue 5]

AMC · AMC1 23.2520 — CS-23 · ED Decision 2026/003/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

AMC Acceptable means of compliance

## AMC2 23.2520 High-intensity radiated fields (HIRF) protection

CS-23 Amdt 4

23.1308 High-Intensity Radiated Fields (HIRF) protection

AMC · AMC2 23.2520 — CS-23 · ED Decision 2017/025/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

AMC Acceptable means of compliance

## AMC3 23.2520 High-intensity radiated fields (HIRF) protection

None

AMC · AMC3 23.2520 — CS-23 · ED Decision 2017/025/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

[All rules in SUBPART F — SYSTEMS AND EQUIPMENT](https://avioverse.aero/regulations/easa/cs-23/subpart-f)

Consolidated from the EASA Easy Access Rules (revision 13 May 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.