gents,
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the FAR takeoff field length is the LONGEST of the following:
1. the distance required to accelerate with all engines, experience an engine failure, continue the takeoff and reach a point 35' above the runway at V2 speed (accel-go)
2. the distance required to accelerate with all engines, experience an engine failure, recognize the failure, initiate the stopping maneuver and stop within the confines of the runway (accel-stop)
3. 1.15 times the all engine takeoff distance required to reach 35' above the runway
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interestingly, most of the discussions here centered on 4-eng acft. on 4-eng acft, it is most likely runway limited because you only lose 25% thrust unlike a 2-eng acft which will be climb limited cos you lose 50% of thrust. i recall clearly when i was on the 747, on a field length limited takeoff, Vr is about 2000' (runway edge - amber) from the end whereas now, i'm on the b777, on a field length limited takeoff, there's probably about 4000' left.
HS