Home' RTCA Documents for Review : DO-220A Change 1 Contents 1
DO-220A Change 1
© 2018 RTCA, Inc.
PURPOSE AND SCOPE
This document contains Minimum Operational Performance Standards for Airborne Radar
Systems that may include any combination of the following functions: weather detection,
ground mapping, forward-looking windshear detection, forward-looking turbulence
detection, or atmospheric threat awareness capability.
These standards specify system characteristics that should be useful to designers,
manufacturers, installers, and users of the equipment. The requirements defined in
Subsection 2.1 and Paragraphs 2.2.1, 2.2.2, and 2.2.5 of this MOPS are applicable to both
rotorcraft and fixed-wing aircraft. Paragraph 2.2.5 can be used to address the indication of
turbulent conditions or microburst events ahead of the aircraft for rotorcraft. This document
does not define the MOPS for forward-looking windshear or turbulence detection
capability for rotorcraft.
Compliance with these standards is one means of assuring that the equipment will perform
its intended function(s) satisfactorily under all conditions normally encountered in routine
aeronautical operation. Any regulatory application of this document is the sole
responsibility of appropriate governmental agencies.
Section 1 of this document provides information needed to understand the rationale for
equipment characteristics and requirements stated in the remaining sections. It describes
typical equipment operations and operational goals, as envisioned by the members of
Special Committee 230, and establishes the basis for the standards stated in Sections 2 and
3. This section also contains definitions and assumptions essential to proper understanding
of this document.
Section 2 contains the Minimum Performance Standards for the equipment. These
standards specify the required performance under standard environmental conditions. Also
included are recommended test procedures necessary to demonstrate equipment
compliance with the stated minimum requirements.
Section 3 describes the performance required of installed equipment. Tests for the installed
equipment are included when performance cannot be adequately determined otherwise.
Section 4 describes the operational performance characteristics for equipment installations
and defines conditions that will assure the equipment user that the expected operational
environment will allow safe and reliable operation of the equipment.
Appendix A, a normative appendix, describes the windshear database developed for the
certification testing of airborne forward-looking windshear detection systems, and defines
the test scenarios used for this testing. It also includes considerations associated with the
use of the windshear test set-up
Appendix A, an informative appendix, includes plots associated with the windshear data
Appendix C, a normative appendix, describes the analytical technique for evaluation of
windshear missed events and nuisance alerts.
Appendix D, an informative appendix, contains historical information and derivations that
may be useful to the radar designer.
The word “equipment” as used herein includes all components or units necessary (as
determined by the equipment manufacturer or installer) for the equipment to properly
perform its function. For example, the airborne radar "equipment" may include a radome,
an antenna, antenna mounting, transmission line, a receiver/transmitter unit, a
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