A device for access to data by clients aboard an aircraft, each of the clients being associated with an avionics application. Each of the clients includes a facade allowing access by the avionics applications to the data stored on the server. The facade includes means for signing up of the avionics application associated with the client to a subscription to a modification of a data item, and means for filtering notifications of modifications on the data sent by the data server as a function of the subscriptions of the avionics application associated with the client, and for warning the avionics application associated with the client of a modification of a data item to which it has subscribed.