Sometimes manufacturers don't learn of a quality issue until after a customer goes to the dealer with a complaint and the dealer ships the faulty part back to the factory.

FORBES: Big Mechanic Is Watching

Should such a high risk attack fail due to faulty information or prudent anticipation on the part of the adversary, the enemy may not be deterred and may respond with even greater force.

CENTERFORSECURITYPOLICY: Center for Security Policy | Chinese Information Warfare: A Phantom Menace or Emerging Threat? | Page: 14

Officials also found that faulty taping led to cracks in cockpit glass, while problems with a part led to braking difficulties.

BBC: Boeing 'set to offer plan to fix Dreamliner battery'