Components of the UltraQuiet balancer In flight, accelerometers mounted on the engine or gearbox communicate radial vibration to the UltraQuiet balancer controller. The controller also receives a signal from the engine tachometer to tell it propeller speed and position. Up to 75 hours of balancing data can be stored in the controller's memory for download at the operators convenience. When the operator wishes to rebalance their aircraft's propellers, the information is transfered from the controller to the balancer terminal. The balancer terminal then calculates and displays the optimum minimum mass rebalance solution, accounting for any fixed weights already on the propeller hub. The UltraQuiet balancer controller can either be a standalone unit or its functionality can be integrated into the UltraQuiet cabin Active Noise and Vibration Controller as is now standard equipment on the Bombardier Q400 Dash8 turboprop.

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