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[[Image:Water turbine.jpg|thumb|right|230px|[[Water turbine|Hydraulic turbine]] and [[electrical generator]].]] ...ntial energy]] in water is proportional to the head. To deliver water to a turbine while maintaining pressure arising from the head, a large pipe called a [[p

...emergency [[deadstick landing]]. The automatic deployment of the [[ram air turbine]] maintained the necessary [[Hydraulics|hydraulic pressure]] to the flight The ultimate form of [[Turbine engine failure|engine failure]], physical separation, occurred in 1979 when