by external bodies which strike the pylon if necessary the oil feeding to the exchange duct 76 in relation with the compartment which is no longer sealed is cut the intermediate shaft 6 transmits power from the propulsion unit 4 to the pump 5 by rotation bearings 8 are then provided to support the shaft and allow its rotation moreover a bearing 8 can be provided at each end of the shaft 6 i e at the fuselage 2 and at the propulsion unit 4 due to the bending of the intermediate shaft 6 dynamic effects can occur on the shaft 6 with the risk of damage to correct this at least one intermediate bearing can be provided in the pylon 3 several intermediate bearings 81 a 81 b can be positioned in the pylon 3 to support the weight of the shaft 6 at regular intervals the intermediate bearings 81 a 82 b are typically housed in enclosures 84 a 84 b the intermediate bearings 81 a 81 b can for example be supported on longerons as for any bearing it is necessary to lubricate the intermediate bearings 81 a 81 b in an advantageous embodiment an oil intake duct 82 draws oil from the feed line 78 and carries it to the enclosure 84 a 84 b where the intermediate bearing 81 a is housed an oil exhaust duct 83 returns the oil from the enclosure 84 a of the intermediate bearing.