[ladyjane]

I read that the plane was on the runway when the pilots noticed the problem.

Who knows if *anything* we read in the media is true.

[ConservativeWarrior]

Part of the preflight is done before engines are started. Another prior to taking the active runway, and the final is done as the plane accelerates down the runway.

Surprised they found an issue with the pitot tube before the takeoff roll.