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Old Jun 28, 2013 | 3:30 pm
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jrl767
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flight crews on older jets like the 727 that don't have digital flight decks have to use the paper WAT (Weight/Altitude/Temp) charts in the flight manuals to determine takeoff distances and speeds ... the WAT tops out at 120F, and while it was legal for the crew to interpolate between lower temps, it was not legal to extrapolate beyond the printed limit

DL 1797, PHX-LAX, 27 Jun 1990
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