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A ram air turbine (RAT) is a small turbine that is connected to a hydraulic pump, or electrical generator used as a power source for aircraft. In some early aircraft, these were permanently mounted and were the aircraft's principal electrical power source.
With the exception of crop dusters (see below), modern aircraft only use RATs in emergency - in case of the loss of both primary and auxiliary power sources the RAT will power vital systems (flight controls, linked hydraulics and also flight-critical instrumentation). Some RATs produce only hydraulic power, which is in turn used to power electrical generators.
