This document contains a minimum operational performance
specification for airborne VHF communications equipment (receiver
and transmitter) intended to be used for airground communication.
It is designed to ensure that equipment certified to it will be
compatible with the relevant ICAO Standards and Recommended
Practices as described in ICAO Annex 10 Sections 4.5, 4.7 and
Appendix D. It is also intended to cover equipment suitable for use
in an 8.33 kHz channel separation environment.
NOTE:In the following text the
channel spacing for 8.33 kHz channel assignments is defined as 25
kHz divided by 3 which is 8.3333.... kHz.
This minimum operational performance specification defines the
minimum performance expected of an aircraft VHF
receiver-transmitter equipment; the performance of a specific
equipment may be enhanced or superior to this specification
depending on the intended application and configuration.
Chapter 1 describes typical equipment applications and
operational objectives and is the basis for the performance
criteria specified in Chapter 2 and Chapter 3. Definitions
essential to proper understanding of this document are also
provided in Chapter 1.
Chapter 2 contains general design requirements.
Chapter 3 contains the minimum performance specification
for the equipment, defining performance under standard operating
Chapter 4 prescribes the environmental test conditions
which provide a laboratory means of determining the overall
performance characteristics of the equipment under conditions
representative of those which may be encountered in actual
Chapter 5 describes recommended test procedures for
demonstrating compliance with Chapter 3.
Chapter 6 specifies the performance of the installed
equipment. Ground and flight tests for the installed equipment are
included when performance cannot be adequately determined through
testing under standard test conditions.
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