Once enjoying a landing in the jump seat of an airbus the captain was very insisting all the straps had been used and secured tight. I was told about an incident during a landing when somebody in the jump seat slipped thru the straps after the wheel brakes and reverse was fully applied and then hit the throttle.. the airbus nearly took off again..
so what if the observer wasn't 'secured' in the straps and whilst the heli went into some unusual position due to fuel, fenestron, engine failure ect the left seat person tried to hold on to something?