a data acquisition system (18) for use in a data recorder of the aircraft (10) receives the multiple analog signals (12) and (14) representative of discrete parametersthe plane.a command address from the central processing unit (cpu) (24) of the flight data recorder (10) causes the selection by a first multiplexer (56) of a series of analog signals.the amplified analog signal is selected (61, 62, 63) by a gain factor under the control of the cpu (24), and led to a set of monitoring and maintaining channels (71, 72)73) that maintains a level of the analog signal is amplified after receipt of an appropriate command.the levels of analog signals are led to a sustained second multiplexer (80) with a series of discrete signals selected by a first multiplexer (84) in response toa control address of cpu (24).a control mechanism (96) sequence is sequentially each signal at the input of the second multiplexer (80) by an analogue to digital converter (90).the digital signal which is stored in memory (92).after the analogue to digital conversion and storage of analog signals is selected and processed, or discrete signals selected.the mechanism of sequence order (96) sends an interruption signal to the cpu (24).
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