---
title: "ETSO-C4c — CS-ETSO · Avioverse"
description: "Bank and Pitch Instruments 1 Applicability This ETSO gives the requirements which bank and pitch instruments that are manufactured on or after the date…"
url: "https://avioverse.aero/regulations/easa/cs-etso/subpart-b/etso-c4c"
---

# ETSO-C4c

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

IR Implementing rule

## ETSO-C4c

Bank and Pitch Instruments

1 Applicability

This ETSO gives the requirements which bank and pitch instruments 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 SAE Aerospace Standard (AS) document: AS-396B, „Bank and Pitch Instruments“, dated July 15, 1958, as amended and supplemented by this ETSO:

(i) Conformance with the following paragraphs of AS-396B is not required: 3.1; 3.1.2; 3.2; 4.3.5.

(ii) Substitute the following for paragraph 7. of AS-396B : „Performance tests: The following tests in addition to any other deemed necessary by the manufacturer, shall be the basis for determining compliance with the performance requirements of this standard.“

3.1.2 Environmental Standard

As specified in SAE document: AS-396B.

3.1.3 Computer Software

None

3.2 Specific

None

4 Marking

4.1 General

Marking is detailed in CS-ETSO Subpart A paragraph 1.2.

In addition the following information shall be legibly and permanently marked on the equipment: Nominal power input rating (electrical voltage and frequency, vacuum or air pressure).

4.2 Specific

None.

5 Availability of Referenced Document

See CS-ETSO Subpart A paragraph 3.

IR · ETSO-C4c — 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.