helicopter-redeye, is there another name for "chadwickomiter"? I gather this would be some instrumentatiun to measure flapwise movement of blade?
Sorry, try Model 2000 Balancer System (Chadwick) part number KI-68. Used in blade tracking/ balancing. The wire attaches to a 'sort of osciliscope' that will be in the cab. I can't see it entering via the door cowls (usual approach) so it may be "permanently fitted" and wired through the roof light.
IF this is what the device and wire/ tape is for then I guess the engineers would be looking for any blade tracking deviations in certain manoeuvers.
h-r (CDT)