The Financial Times' China targets rare earth export curbs to hobble US defence industry states:
Fighter jets such as the F-35, a Lockheed Martin aircraft, rely heavily on rare earths for critical components such as electrical power systems and magnets. A Congressional Research Service report said that each F-35 required 417kg of rare-earth materials.
Rare Earth elements are commonplace rather than rare in high tech devices and systems these days, but usually in small quantities. The exception are rare-earth permanent magnets used in electric motors and generators.
But 417 kg sounds like a lot; it's 3.1% of a reported 13,290 kg dry weight of an F-35A.
Could this be true? Or are they counting for just for example the whole motor rather than the rare earth within it?