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DO-220A Change 1
Equipment Performance – Environmental Conditions
The environmental tests and performance requirements described in this section provide a
laboratory means of determining the overall performance characteristics of the equipment
under conditions representative of those that may be encountered in actual aeronautical
Some of the environmental tests contained in this section need not be performed unless the
radar system manufacturer wishes to qualify the equipment for that particular
environmental condition. These tests are identified by the phrase “When required.” If the
radar system manufacturer wishes to qualify the equipment to these additional
environmental conditions, then these “When required” tests shall be performed.
The test set-up procedures applicable to a determination of equipment performance under
environmental test conditions are contained in RTCA Document DO-160G, Environmental
Conditions and Test Procedures for Airborne Equipment, December 8, 2010. However,
you may use RTCA/DO-160E, dated December 20, 2005, or later revision.
Some of the performance requirements in Subsection 2.2 are not tested by the test
procedures herein. Moreover, not all performance tests are required during each of the
environmental conditions in RTCA/DO-160G. Judgment and experience have indicated
that these particular performance parameters are not susceptible to certain environmental
conditions and that the level of performance specified in Subsection 2.2 will not be
measurably degraded by exposure to these environmental conditions.
Additional tests may have to be performed in order to determine performance of particular
design requirements that are not specified in this document. It is the responsibility of the
system radar manufacturer to determine appropriate tests for these functions.
Note: During the following environmental tests, the requirements for measurement of
Performance Index will be deemed to have been met if the Performance Index
measured under standard test conditions is corrected by the change in receiver
Minimum Discernible Signal (MDS) and by the change in mean transmitted power
occurring as a result of environmental stress.
Environmental Test Conditions
Table 2-5 lists all of the environmental conditions and test procedures (hereafter referred
to as environmental procedures) that are documented in RTCA/DO-160G. These are cross-
referenced with the performance tests specified in detail in this section, which should be
run subject to the various environmental procedures of RTCA/DO-160G. The performance
tests are run (D)uring and/or (A)fter each environmental test as specified in the table. If the
entry is grayed-out, performance testing is not required in conjunction with that
Table 2-5: Performance Test Requirements for Environmental Tests
Temperature / Altitude
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