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Aviation Communication Equipment Approvals (European, US Standards)

Information below refers to AIRBORNE approval requirements.

General Information
Walter Dittel Communications Equipment
Ground operation

General Information

For Aviation Transceiver type approval, MOPS (Minimum Operational Performance Specification) documents requirements must be met. Very detailed Documents are to be submitted for Compliance Verification through the NAA (National Approval Authority).

The MOPS defines main functional, operational and further design requirements to be met. There are numerous, almost identical agreed-upon procedures established in the USA and in Europe. All approval requirements are summarized in American TSO (Technical Standard Order), issued by the FAA, and JTSO (Joint Technical Standards), issued by the Joint Aviation Authority (JAA), the European international organization which coordinates applicable Europe-wide common requirements. These are most often compatible with FAA TSO's. JAA requirements are summarized in JAR (Joint Aviation Requirements) / FAR in the USA.

MOPS have certain issue dates, for example:

The ED-23A / DO-186 is much older than ED-23B / DO-186A
DO-160B / ED-14B is much older than DO-160D / ED-14D.

ED-23B is the applicable EUROPEAN document issued from EUROCAE, Paris.
EUROCAE is European Civil Aviation Electronics Organization.

In addition, the ED-14D was updated by "Change 1" in December 2000 regarding Section 8 Vibration and Section 20 RF Susceptibility (Radiated and Conducted).

ED- means edition.
DO- means document.



There are strict regulations regarding quality control. Authorized manufacturers of airborne communication equipment must possess POA (Production Organization Approval). No equipment may be produced without this authorization. The applicant must submit voluminous paperwork to the NAA. In the US, the FAA (Federal Aviation Administration) handles this, in Germany this is done by the LBA (Luftfahrt-Bundes-Amt, German Federal Aviation Authority).



JTSO-2C37e (Receiver) and JTSO 2-C38e (Transmitter) are the EUROPEAN standards which are comparable with FAA TSO-2C37e and TSO-2C38e. The (e) issues include both 8.33 kHz and 25 kHz equipment performance requirements, while (d) is for 25 kHz only.

Such General regulations describe the applicable MOPS documents for transceivers. These include ED-23B, ED-14D and ED-12B in case of transmitters and receivers, and the applicable issues of these documents.

ED-23B specifies detailed environmental performance requirements under various operating conditions, e.g. temperature, altitude, vibration, shock etc. These are further detailed in the common EUROCAE ED-14D / RTCA DO-160D document.

DO-186A is the actual USA document (comparable with ED-23B) issued from RTCA (Radio Technical Commission of Aeronautics).

Class C is specified in both ED-23B and DO-186A for a Receiver, 25 kHz CH spacing, intended for use in CLIMAX (channel offset carrier operation).

Class E is specified in both ED-23B and DO-186A for a Receiver, 8.33 kHz CH spacing, NOT intended for use in CLIMAX (channel offset carrier operation).

Class 4 specifies 25 kHz CH spacing transmitter for 100 nautical miles range (minimum 4 Watt RF output power).

Class 6 specifies 8.33 kHz CH spacing transmitter for 100 nautical miles range (minimum 4 Watt RF output power).


Walter Dittel Communications Equipment

Dittel's FSG 90 family of radios offers both Classes C and E receiver, plus Classes 4 and 6 transmitter.

The "Environmental Qualification Form" is based on 14D / 160D MOPS, listed in the appropriate Operating Manual to assist the installer (see FSG 71M and FSG 90 manuals).

All Categories are covered and classified with the characteristics associated with the applicable figure:

D1-A means Operating Temperature -20°C…+55°C operation, plus 30 minutes functional at +70°C, at Altitudes up to 15 000 m / 50 000 ft.

In addition, when software is involved, it must be separately certified and approved, based on RTCA DO-178B, compatible with EUROCAE ED-12B.


Ground operation

All Dittel's airborne radios are also approved for GROUND operation by DFS (German National ATC Authority), which issues type approvals for GROUND based transceivers. CE Compliance is also fully met.


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