Section 20 of the RTCA/DO-160G standard is an equivalent test method to MIL-STD-461G, CS101 "Conducted Susceptibility, Power Lines and Interface Ports." MIL-STD-461G, CS101, CS101, and RTCA DO160, Section 20 test methods evaluate equipment's susceptibility to disturbances on the power lines and interface ports.
The test results determine whether the equipment under test (EUT) meets the EUT's respective operating and functional requirements when subject to susceptibility disturbances, CS101 and Section 20 of MIL-STD-461G and RTCA/DO-160G, respectively.
Though RTCA/DO-160G, Section 20 and MIL-STD-461G, CS101, test methods are similar, and one can use their results to demonstrate compliance interchangeably as using "alternative test methods" to meet compliance test requirements, the test results, in this case, Section 20 test results, must provide a high quality of evidence that the results are equivalent to CS101 test method initially specified in the EUT's EMC requirements. Furthermore, the procuring agency (Army, Air Force, or Navy) or the clients must approve using the alternative test method.