Having recently completed a course put together by Dupont called STOP training (Safety Training Obvservation Program) that repeatedly hammered that ALL accidents are preventable, I would have to agree that by Bryan's definition of an accident that they pretty much all are preventable. Certainly anything arising from carelessness or ignorance should be preventable.

That having been said, I would still typically consider problems that arise from broken equipment or events beyond your control to still be accidents. Case in point, a deer is walking on top of a bridge, a car driving by spooks the deer which jumps over the railing, landing on an unlucky vehicle driving by below.

[Linked Image from whisperscorner.com]

Luckily no one was hurt this time, except the deer, and the vehicle of course!