The report contains the results of a flight test evaluation of the Dynamic Antiresonant Vibration Isolator DAVI. In this program, three series of tests were conducted for four different weight configurations of a DAVI isolated platform. The first series of tests evaluated the unidirectional DAVI, the second series of tests evaluated the two-dimensional DAVI, and the third series of tests evaluated the three-dimensional DAVI. The test results showed that the unidirectional and the two-dimensional DAVI isolated platforms did not achieve the expected reduction in vibration and, in some conditions, reduction was very poor. However, the reduction of vibration obtained on the three-dimensional DAVI isolated platform was excellent. A comparison of results obtained on the three- dimensional isolated platform and a conventionally isolated platform shows that the three-dimensional DAVI isolated platform had the lower vibration level and was less sensitive to changes in isolated weight or to changes in helicopter rotor speed excitation frequency.