Tip rib mounted pylon assemblies

A tiltrotor aircraft having a pylon assembly, a helicopter mode and an airplane mode, the tiltrotor aircraft comprising:

• an airframe including a fuselage and a wing;
• and
• a pedestal assembly disposed above the wing distal from the fuselage, the pedestal assembly including:
• an inboard tip rib extending above the wing and defining an inboard slot;
• an outboard tip rib extending above the wing and defining an outboard slot;
• an inboard bearing cartridge received within the inboard slot and coupled to the inboard tip rib, the inboard bearing cartridge including an inboard bearing assembly;
• and
• an outboard bearing cartridge received within the outboard slot and coupled to the outboard tip rib, the outboard bearing cartridge including an outboard bearing assembly;
• wherein, the inboard and outboard bearing assemblies are operable to receive the pylon assembly therein such that the pylon assembly is rotatably mounted between the inboard and outboard tip ribs to selectively operate the tiltrotor aircraft between the helicopter mode and the airplane mode.