IRImplementing rule
ETSO-2C169a
VHF RADIO COMMUNICATIONS TRANSCEIVER EQUIPMENT OPERATING WITHIN THE RADIO FREQUENCY RANGE 117.975 TO 137.000 MEGAHERTZ
1 Applicability
This ETSO gives the requirements which new models of VHF Radio Communications Transceiver Equipment Operating within the Radio Frequency Range 117.975 to 137.000 Megahertz that are manufactured on or after the date of this ETSO must meet in order to be identified with the applicable ETSO marking.
This ETSO cancels ETSO2C37e 'VHF Radio Communication Transmitting Equipment Operating within the Radio Frequency Range 117.975137.000 Megahertz' and ETSO -2C38e 'VHF Radio communication Receiving Equipment Operating within the Radio Frequency Range 117.975137.000 Megahertz'.
2 Procedures
2.1 General
Applicable procedures are detailed in CS-ETSO Subpart A.
2.2 Specific
This ETSO applies to equipment intended for aircraft VHF amplitude modulated (AM) communications operating within 117.975 to 137.000 MHz. This includes 25 and 8.33 kHz channel spacing capabilities. VHF communication equipment covered by this ETSO is primarily intended for aeronautical operational control (AOC) and air traffic services (ATS) safety communications.
3 Technical Conditions
3.1 Basic
3.1.1 Minimum Performance Standard
Standards set forth in EUROCAE document ED23C 'Minimum Operational Performance Standards for Airborne VHF Receiver-Transmitter Operating within the Radio Frequency Range 117.975137.000 MHz', dated June 2009 for the equipment classes defined in the following table.
Table of Equipment Classes for VHF Communication Equipment It is recommended that, when applying for ETSO-2C169a authorisation, the applicant also applies for ETSO-2C128 'Devices that Prevent Blocked Channels Used in TwoWay Radio Communications due to Unintentional Transmission' authorisation.
| Equipment Class | Description |
|---|---|
| C | Receiver used in a 25 kHz channel separation environment having off-set carrier operation |
| D | Receiver used in a 25 kHz channel separation environment not having off-set carrier operation |
| E | Receiver used in an 8.33 kHz channel separation environment not having off-set carrier operation |
| H1 and H2 | Receivers which are to be used in a 8,33 kHz channel separation environment and intended for off-set carrier operation with only two carriers. |
| 3 | Transmitter used in a 25 kHz channel separation environment and intended to operate with a range of 200 nautical miles. |
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 major failure condition.
4 Marking
- 4.1 General
Marking is 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/6]
IR · ETSO-2C169a — CS-ETSO · ED Decision 2010/010/R · CS-ETSO Easy Access Rules · EAR revision 14 Aug 2026