Can anyone tell me what the green pull switch does on the auxiliary panel (SWB series 3, petrol). Doesn’t appear to do anything and there are no electrical items without switches so can’t work this out.
 
Is it the brake failure test switch for the pressure differential switch proves the lamp is working.
 
deploys the parachute when dropping from a Hercules or when dislodging from the underslung load hook from a Wessex helicopter. Ex SDS o_O
 

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