Abdul-Majeed Marouf Ahmed Alani "airplane mechanic" damaged a navigation system on a plane filled with 150 passengers (Miami to Bahamas waiting for takeoff)
The plane had come in from Iraq. Abdul claimed "he was only trying to get overtime" (plane already had passengers IN it, could have taken off without detecting damage, his claim is automatically rejected).
Abdul injected liquid expanding foam into the ADM’s inlet sensor while the plain was on the runway with 150 passengers in it. (acoustic displacement measurement sensor helps monitor the plane’s “speed, pitch, wind pressure, to correct critical critical flight data". If the pilot had not noticed "something unusual", lack of ADM could definitely effect take-off: it could contribute to a STALL or a problem compensating for cross-winds - the two main dangers of taking off.
Again, this was not done in the hangar pre-flight: it was done on the runway with passengers waiting for take-off.
https://www.breitbart.com/politics/2019/09/07/exclusive-american-airlines-mechanic-accused-of-sabotaging-flight-came-to-u-s-from-iraq/