Hello again all how do you do. I know that most of you will know about some Boeing 747’s in the past that ran into volcanic ash and suffered a loss of power in all 4 engines when they failed. So what happens in the cockpit when all engines fail? Does the aeroplane’Fall out of the sky?’ To use a favourite term by the media. The answer is NO! It does not ‘Fall out of the sky’. It just becomes a large glider the wings still produce lift due to forward speed(albeit in descent). Emergency standby power activates, using the aircraft battery to provide enough flight instruments for the Captain to have direction/speed. An emergency Ram air Turbine deploys on the failure of the third engine to provide hydraulic power to run system 3. This gives flight control power. The First Officer then has to start attempting to restart the engines/ doing the checklist. Hopefully at lower altitudes, with better airflow etc a stalled engine will restart. This video gives you a quick overview of what instrumentation/control is available when all power is lost. Hope it gives you some insight into such an emergency.
Chi Di Gin! Later!✈✈✈✈