Although the Boeing 787 was three years behind its original development schedule, and then grounded because of a fire hazard, it promises to be both the most radical, and successful, airplane ever developed by Boeing. A rule of thumb is a that a commercial airplane design should incorporate only one new technology, because a company does not possess the resources to handle more than one. The 787 possesses several such as nearly all composite structure, and all-electric (almost) secondary power systems.