---
title: "ETSO-C5f — CS-ETSO · Avioverse"
description: "Direction Instrument, Non-Magnetic (Gyroscopically Stabilized) 1 Applicability This ETSO provides the requirements which Direction Instruments…"
url: "https://avioverse.aero/regulations/easa/cs-etso/subpart-b/etso-c5f"
---

# ETSO-C5f

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

IR Implementing rule

## ETSO-C5f

Direction Instrument, Non-Magnetic (Gyroscopically Stabilized)

1 Applicability

This ETSO provides the requirements which Direction Instruments, Non-Magnetic (Gyroscopically Stabilized) that are designed and 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 Subpart A.

2.2 Specific

None.

3 Technical Conditions

3.1 Basic

3.1.1 Minimum Performance Standard

Standards set forth in the SAE Aerospace Standard AS8021, ‘Direction Instrument, Non-Magnetic (Gyroscopically Stabilized)’, dated March 16, 1981.

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.

3.1.4 Electronic Hardware Qualification

See CS-ETSO, Subpart A, paragraph 2.3.

3.2 Specific

None.

3.2.1 Failure Condition Classification

See CS-ETSO, Subpart A, paragraph 2.4.

Failure of the function defined in paragraph 3.1.1 of this ETSO resulting in misleading information is a major failure condition. Failure of the function defined in paragraph 3.1.1 of this ETSO resulting in loss of information is a minor failure condition.

4 Marking

4.1 General

Marking as detailed in CS-ETSO, Subpart A, paragraph 1.2.

4.2 Specific

None.

5 Availability of Referenced Document

See CS-ETSO, Subpart A, paragraph 3.

\[Amdt ETSO/11]

IR · ETSO-C5f — CS-ETSO · ED Decision 2016/013/R · 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.