Abstract: The documentary assistance device (1) comprises sources of computer data (S1 to Sn, B1 to Bp) relating to said aircraft, to elements of the latter, as well as to the outside environment, an interrogation means (2) capable of being activated by an operator so as to generate a request for information relating to the execution of at least one particular task, an information presentation means (5), and a central processing unit (6) searching the data sources (S1 to Sn, B1 to Bp) in response to the creation of a request for information by the interrogation means (2), for data relating to the execution of the task, collecting these data and transmitting them, in the form of information, to the information presentation means (5) with a view to their presentation to the operator.