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Old 25th Aug 2004, 13:09
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2 Liter Peter
 
Join Date: Mar 1999
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Well thanks, OKC, for your tribute and picking up the point about the over-run at Menorca. You are of course absolutely right to declare the basics of performance mean that there is never a problem, and that decisions to stop above V1 are anathema. Might one perhaps explain a slightly different angle of view ?

There is a school of thought that goes that V1 is all about engines failing. If they haven't failed, but something else has, you don't actually have a performance problem with a "go" decision, even from way below V1 - the jet will still eventually fly, and very comfortably clear obstacles, like on every other normal take-off. You may of course have other problems, as would be the case with all your pitot heads full of bees.

By contrast, the closer you get to V1, the more you do have a performance problem with trying to stop. Especially with all the factors that can insidiously prejudice V1 - worn brakes, extra luggage weights, tarmac air temperatures way above tower quoted temperatures, you can probably name a few more. Even more especially if your airspeed readout is unreliable : who knows at what real speed that 80-knot or 100-knot call came ?

Flying off over a cliff still with all engines running might perhaps seem like a good idea in decent weather, even with dodgy airspeed readouts, compared with the alternative of trying to stop from a decision necessarily taken at an unknown speed close toward V1 faced with that slope down to the uninviting cliff to topple over if you got it wrong.

So one was interested to know which runway was in use, and whether it was a factor. This all might be a little academic, as prb46 and rosario have pointed out that this incident has not happened.
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