There is no function assigned to the switch:
In the file controls.tmd the operation is programmed:
<[control_cylinder][SwitchIcing][]
<[string8][Type][switch toggle]>
<[tmvector3d][R0][ 0.76705 0.36113 0.27278 ]>
<[tmmatrix3d][B0][ 1.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 1.0 ]>
<[tmvector3d][Direction][ 0.0 0.0 1.0 ]>
<[float64][StepDistance][0.01]>
<[control_message][OnStep][]
<[string8][Message][Controls.Icing]>
<[string8][Qualifiers][step]>
<[float64][Value][1.0]>
>
<[float64][Radius][0.003]>
<[float64][Length][0.017]>
>
<[control_cylinder][SwitchIcingBase][]
<[string8][Type][switch toggle base]>
<[tmvector3d][R0][ 0.775 0.36113 0.27278 ]>
<[tmmatrix3d][B0][ 1.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 1.0 ]>
<[tmvector3d][Direction][ 0.0 0.0 1.0 ]>
<[float64][StepDistance][0.01]>
<[control_message][OnStep][]
<[string8][Message][Controls.Icing]>
<[string8][Qualifiers][step]>
<[float64][Value][1.0]>
>
<[float64][Radius][0.006]>
<[float64][Length][0.002]>
>
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In the file b58.tmd, however, only the function (DynamicObjects) for the operation and the graphical display (GraphicObjects) is programmed but no actual use:
<[file][][]
<[modelmanager][][]
<[pointer_list_tmuniverse][DynamicObjects][]
...
// main bus start
...
<[input_switch][SwitchIcing][]
<[string8][Message][Controls.Icing]>
<[string8][Events][ SwitchSoundLeft.Trigger ]>
<[string8][EventsRelease][ SwitchSoundLeft.Trigger ]>
<[float64][Value][1.0]>
>
// main bus end
...
>
<[pointer_list_tmgraphics][GraphicObjects][]
...
// icing switches
<[hingedbodygraphics][SwitchIcing][]
<[uint32][PositionID][Fuselage.R]>
<[uint32][OrientationID][Fuselage.Q]>
<[string8][GeometryList][ SwitchIcing ]>
<[tmvector3d][Axis][ 0.0 1.0 0.0 ]>
<[tmvector3d][Pivot][ 0.775827 0.360798 0.272743 ]>
<[float64][Scaling][0.5]>
<[uint32][InputID][SwitchIcing.Output]>
<[string8][InputIllumination0][PanelLighting.Output]>
>
...
>
>
>
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If there was a use, this would be in the segment DynamicObjects.
In reality, there is always the fact that a control element is installed, but it is not connected.