21.   The recall has focused scrutiny primarily on the sometimes catastrophic failure of tires that were under-inflated.

22.   Witnesses reported hearing and seeing an engine fall off, and investigators suggested the noise was caused by a catastrophic mechanical failure.

23.   Depending on who is to be believed, he will be a catastrophic failure or revolutionize the game.

24.   The other theories are that it was brought down by a bomb or by a catastrophic mechanical failure.

25.   The third theory is a catastrophic mechanical failure.

26.   Unidentified aviation experts told the United Daily News the crash may have been caused by an explosion or sudden catastrophic mechanical failure.

27.   Newspapers here quoted aviation experts as saying the crash may have been caused by catastrophic mechanical failure or an explosion.