E029 EFFECT OF THE CONDUCTING AIRCRAFT TO FIXED-WING AIRBORNE ELECTROMAGNETIC MEASUREMENTS Introduction 1 Airborne electromagnetic (AEM) surveys at the Geological Survey of Finland (GTK) are carried out with fixed-wing EM systems using Twin Otter and Cessna aircrafts. Both AEM systems of GTK use a two-frequency vertical coplanar coil system. The coil pairs for the dual frequency systems are mounted on the wingtips – transmitter coils on the right and receiver coils on the left. The coil spacing is 21.36 m for the Twin Otter system and 16.96 m for the Cessna system. The two frequencies are 3.1 kHz and 14.4


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