In aviation, a flight-data acquisition unit (FDAU) is a unit that receives various discrete, analog and digital parameters from a number of sensors and avionic systems and then routes them to a flight data recorder (FDR) and, if installed, to a Quick Access Recorder (QAR). Information from the FDAU to the FDR is sent via specific data frames, which depend on the aircraft manufacturer.

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There is some trend towards integration of FDAU functions into software contained aboard other aircraft system components, as in the case of an enhanced airborne flight recorder (EAFR)

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