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ETSO-C158

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

IRImplementing rule

ETSO-C158

AERONAUTICAL MOBILE HIGH FREQUENCY DATA LINK (HFDL) EQUIPMENT

1 Applicability

This ETSO gives the requirements which Aeronautical Mobile High Frequency Data Link (HFDL) Equipment 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 Radio Technical Commission for Aeronautics (RTCA) Document DO-265, Minimum Operational Performance Standards for Aeronautical Mobile High Frequency Data Link (HFDL)', dated 14/12/2000.

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

- 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 has been determined to be 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/7]

IR · ETSO-C158 — CS-ETSO · ED Decision 2012/009/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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