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DO-220A Change 1
The operational goal of such equipment is to display areas of significant
turbulence in such a manner as to allow the flight crew the ability to make
operational decisions on how to prepare for and if possible, avoid high-risk
areas of turbulence. This will place a requirement on the timeliness and
location accuracy of the indications on the display.
Atmospheric Threat Awareness
Airborne weather radar equipment may process atmospheric information such as
reflectivity, velocity, spectral width, or other information available to the radar, either
individually or in combination, to provide atmospheric threat information.
The resulting cockpit display provides valid, timely, and current advisory
information to the flight crew to enhance their situational awareness of
atmospheric activity and assist with atmospheric threat avoidance decisions.
This function should not adversely impact flight crew workload.
For radar functions that rely on specified accuracies of other aircraft systems, see Paragraph
2.1.8. Any other assumptions are stated in the corresponding requirements section for each
The test procedures specified in this document demonstrate compliance with the
performance requirements defined in Subsection 2.2. Users of this document should not
infer performance requirements based on Test Procedures.
The order of tests specified suggests that the equipment be subjected to a succession of
tests as it moves from design, and design qualification, into operational use. For example,
it is expected that compliance with the requirements of Section 2 have been demonstrated
as a precondition to satisfactory completion of the installed system tests of Section 3.
Subsection 2.3 defines the environmental test requirements. The procedures and their
associated limits provide a laboratory means of determining the electrical and
mechanical performance of the equipment under environmental conditions expected to
be encountered in actual operations.
Unless otherwise specified, the environmental conditions and test procedures
contained in the latest revision of RTCA\DO-160, Environmental Conditions and Test
Procedures for Airborne Equipment will be used to demonstrate equipment
compliance. You may use RTCA/DO-160E or later revision. In this document, the
requirements of European Organization for Civil Aviation Equipment (EUROCAE)
ED-14E (or later revision) corresponding to the specified requirements of RTCA/DO-
160E (or later revision) also apply.
Bench Tests and Engineering Flight Evaluations
Subsection 2.4 specifies bench test and engineering flight evaluation procedures. The
bench tests detailed in Paragraph 2.4.3 provide a laboratory means of demonstrating
compliance with the requirements of Subsection 2.2. The engineering flight
evaluations in Paragraph 2.4.4 serve to verify the intended function(s) of the radar
system. Equipment manufacturers may use test results as design guidance, for
monitoring manufacturing compliance and, in certain cases, for obtaining formal
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