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#18
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I disagree that this is true generally. Everything I've read about
anti-lock braking systems suggests that they will outperform humans under all but a few special conditions. The special conditions are the cases where locking the wheels is beneficial to a short stop. This is good info, thanks. Here's a nugget from the NTSB report on the SWA accident at Burbank: "At the request of the Safety Board.s Airplane Performance Group, Boeing ran stopping distance simulations for this accident wherein maximum, medium, and minimum 737 autobrake applications, as well as maximum manual brake applications, were simulated for wet runway conditions after the 182-knot touchdown. These data indicate that the accident airplane would have required about 5,000 feet of runway length after touchdown to stop using maximum autobrakes and about 4,700 feet of runway length after touchdown to stop using maximum manual brakes." Still, that's not to say that manual braking would always result in shaving off 300 feet of the ground roll. I guess it depends on the exact conditions and pilot experience and technique. My current opinion is that stomping on the brakes would have been worse than allowing the Autobrake system, but that's just a WAG. Charles Oppermann http://spaces.msn.com/members/chuckop/ |
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