212man
I know that's a quote from the report but the 109 rotor brake isn't connected to the weight on wheels switch anyway, its activated by the landing gear selector, when selected 'down' pressure is allowed into the rotor brake circuit from the utility hydraulic system, so with the wheels selected up (as in this case) it won't work anyway. The only electrical connection to the rotor brake system is the microswitch that puts the light on, on the instrument panel.
The weight on wheels switch does operate the pin that prevents undercarriage up selection when on the ground.
GS