A gearbox being transported. Note its size compared to the two full-sized fire extinguishers. The input drive shaft to the gearbox would be connected to the left protrusion, the propeller shaft to the top (capped) and the lift fan to a protrusion on the bottom. An oil scavenge pump would be connected to the lowermost part of the flat plate on the right hand side, redistributing oil throughout the craft's systems. (James Rowson).