Not much detail, but good to know the person covering the emergency stop button was on top of the job.
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This very important button is often left by its self when aircraft taxi on to stand, I can only guess staff are not trained or trainer told em button will operate when reqd.
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Simple, if the stop button does not have an operator, Aircraft should stop, the button is fitted for a reason, belive me......!!!
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My thoughts are with the injured staff and family......