Auxiliary geared drive for a jet engine

The auxiliary equipment gear device (9) has a drive shaft that is actively connected to the main shaft (11) of the engine (1). An extension shaft is provided that is coaxial to the drive shaft and is operatively connected to the releasable drive shaft, where an auxiliary power unit (39) is arranged in the detachable manner on the extension shaft. The extension shaft is detachable, through a relative translational motion, from the drive shaft and an auxiliary unit of the extension shaft.