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DO-220A Change 1
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peak of the aircraft radar observable truth field as defined in Subparagraph 188.8.131.52.1.2.
Since radar detection of turbulence is statistical in nature, multiple sweeps may be used to
demonstrate compliance for this requirement.
184.108.40.206.1.2.9 Must-Not-Indicate Simulation Verification
In the case of display output for the simulation of dataset “MCY”, demonstrate that the
radar does not display persistent turbulence indications at 12 nm from the aircraft position.
Note: Persistent indications imply that the turbulence indications are spatially
correlated from sweep to sweep.
Angular Display Extent (Subparagraph 220.127.116.11)
Test the radar with actual or simulated atmospheric conditions to demonstrate, at a
minimum, that the radar system provides a graphical output of turbulence threats ahead of
the aircraft, ±25 degrees of either the longitudinal axis or the aircraft track.
Multiple Turbulence Levels (Subparagraph 18.104.22.168)
If multiple levels of turbulence severity are depicted, demonstrate that multiple intensity
levels of turbulence are depicted as sufficiently distinct from one another by evaluation or
Multiple Turbulence Detection Severity Non-Interference (Subparagraph 22.214.171.124)
If multiple levels of turbulence severity are provided, ensure that the less severe turbulence
indication does not adversely impact the detection performance of the severe turbulence
detection. This may be accomplished by ensuring testing of the severe turbulence detection
function includes representative atmospheric conditions which also trigger the less severe
turbulence detection function. [Bowles and Buck 2009] [T-1]
Atmospheric Threat Awareness Test Procedures
Atmospheric Threat Awareness (Subparagraph 126.96.36.199)
Verify that the atmospheric threat awareness function(s) do not adversely impact the
performance and display of the weather, ground mapping, turbulence detection, or
predictive windshear functions. This may be accomplished by ensuring that testing of the
weather, ground mapping, turbulence detection, and/or predictive windshear functions
includes representative atmospheric conditions that also trigger the atmospheric threat
Atmospheric Threat Awareness Performance (Subparagraph 188.8.131.52)
Validate that the following are appropriate: detection level(s), must-detect criteria, must-
not-detect criteria, range, and azimuth requirements for the atmospheric threat awareness
function in Subparagraph 184.108.40.206.
Test the system with actual atmospheric events representative of actual threat conditions.
Select a sufficient number of actual atmospheric events to demonstrate functionality across
a variety of realistic atmospheric conditions and applicable phases of flight for the
atmospheric threat. Data to support these threat occurrences may be collected by in-situ
measurements, ground based radar systems, simulated historical atmospheric events, or
other applicable means.
Test the system with simulated or actual atmospheric events which represent the boundary
conditions for the must-detect and must-not-detect requirements.
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