AGB ventilation turbojet comprising such a relay

The present invention relates to an accessory gearbox (20), adapted in particular to be mounted on the fan casing of a jet engine, comprising an input shaft and a plurality of drive shafts of the accessories, characterized in that a compartment forming an interface with an accessory (21) is provided on the housing (23) of the accessory gearbox (20) on the location of the accessory, said interface compartment having an inlet opening (31) and an outlet opening (33), the two openings (31, 33) being arranged to allow the flow of air inside the compartment. The invention also relates to the multi-stream turbojet engine comprising a fan and an accessory gearbox mounted in particular on the blower housing inside the blower compartment provided between the fan casing and the nacelle surrounding the fan, characterized in in that the interface compartment communicates through one of said openings (31, 33) with the outside air to the fan compartment and the other with the air inside the blower compartment.