Digital Flight Data Acquisition Unit
|Term||Digital Flight Data Acquisition Unit|
Digital Flight Data Recorder (DFDR)
Flight Data Acquisition Unit (FDAU)
an electronic device that collects, samples, conditions, and digitizes analog, discrete, and digital signals representing aircraft functions. It supplies a serial digital bit stream to the DFDR.
FAA (1999) Advisory Circular 20-141, AIRWORTHINESS AND OPERATIONAL APPROVAL OF DIGITAL FLIGHT DATA RECORDER SYSTEMS 
A DFDAU differs from a Flight Data Acquisition Unit (FDAU) in that a DFDAU is capable of receiving both analog and digital data streams and converting them to the required DFDR digital data format. (See Aeronautical Radio Incorporated (ARINC) Characteristic 717.)