In an aircraft having a central maintenance computer, an ACMS system and a communications unit allowing communications with a ground station, a maintenance aid device comprises a processing unit configured to: store a trigger condition dependent on at least one aircraft maintenance data item and/or at least one aircraft flight data item; acquire first data emanating from the central maintenance computer and/or second data emanating from the ACMS system; verify whether the trigger condition is met, on the basis of the first data and/or of the second data; and if the trigger condition is met, send the communications unit, a dataset comprising maintenance data emanating from the central maintenance computer and aircraft flight data emanating from the ACMS system.