Originally Posted by
Bucking Bar
Below v1 ... I'll stick my neck out and say, ABORT! What justification is there to use emergency authority to continue?
Controllers only cancel a takeoff clearance when there is an immediate threat to safety.
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.
Sorry, didn't notice you edited your post. The use of emergency authority isn't necessary, because cancelling a takeoff clearance is not an ATC command to abort.
Again, I was stunned when I heard this. I'll bet that most pilots were like me and thought it meant they were saying you must abort the takeoff. But when I thought more about what they said, they're right. ATC could never take on the liability of telling a crew to abort their takeoff.
Carl