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ETSO-C5f

European Technical Standard Orders (CS-ETSO) · CS-ETSO · EAR revision 14 Aug 2026

IRImplementing 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, NonMagnetic (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 14 Aug 2026

All rules in SUBPART B -LIST OF ETSOS

Consolidated from the EASA Easy Access Rules (revision 14 Aug 2026, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.

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