Originally Posted by
Bucking Bar
Below v1 ... I'll stick my neck out and say, ABORT!
If there's a runway incursion, or I've lined up on a runway with a bulldozer at mid field, or pilot just made a pirep of 40 knots loss of airspeed off the parallel runway, there's probably some very good reason for Tower to cancel the clearance.
What's the book answer?
I was surprised at this one myself. A "Cancel Takeoff Clearance" statement from ATC simply means that they've lost separation per their requirements. It is NOT a command to abort the takeoff. At a recent meeting with an ATC supervisory team, they said aborting the takeoff is up to the crew, we just have to advise them when separation has been lost and cancel their clearance. I was appalled, but that's what they said.
Carl