In the course of installing all test stands in the new lab space SC-Arsenal, in addition to the already existing test stands for thermal turbomachinery at the Institute for Energy Systems and Thermodynamics at TU Wien, the cold-air turbine test stand had to be activated. The turbine, which functions in suction-operation mode with a power output of 10 kilowatts at a rotational speed of 3000 rpm will be powered by the existing centrifugal blower, with exceeding turbine output absorbed by an eddy-current brake. This thesis provides evidence on whether the planned air turbine test infrastructure must be equipped with a safety device that prevents excessive turbine speed after the failure of the brake. As such, deceleration measurements were conducted on the blower at different rotational speeds in order to use the obtained data to calculate the overspeed of the turbine rotor for two different blower drive motors. As a result, mass moments of inertia of the drive train, the turbine and pressure loss in the pipe were determined. The outcome will serve as a basis for the necessary dimensioning of pipes and safety devices of the planned test stand.