The autobrake function applies the brakes when these conditions occur:
· The autobrake selector is in 1,2,3,4, or MAX AUTO
· The thrust levers are in the idle position
· Ground mode (the two trucks are UNTILTED and the landing gear control lever is DOWN after a 0.1 second time delay)
· Wheel spin-up (average wheel speed of the 4th, 5th, 6th, and 7th fastest wheels is more than 60 knots).