V-22 Osprey crash (Ship 4)

Carbon-fiber drive shaft between rotors burned through in hydraulic-fluid engine fire; the redundancy that was supposed to let the aircraft survive engine loss was defeated by the fire-vulnerability of the cross-shaft. Redesigned with titanium drive shafts.

The most expensive helicopter you can think of — we've mentioned it before — the V-22 Osprey. [Tom struggles with a slide that has gone off-screen.] This is interesting, I've never had this happen. The V-22 Osprey is a tilt-rotor, dual-rotor aircraft. It's both a helicopter and an airplane.