[codecraft] Qantas 737 “tailstrike” was caused by iPad data entry fail | Ars Technica

[Philip Durbin]

http://arstechnica.com/gadgets/2015/11/qantas-737-tailstrike-was-caused-by-ipad-data-entry-fail/

"The ATSB investigation said that this was probably the result of the OPT
factoring in so many variables that it's hard for the flight crew to
develop a "rule of thumb" for each plane's takeoff speed and thrust—i.e.,
if the numbers produced by the OPT vary dramatically every time it's used,
it's hard for the flight crew to know when they're wrong."
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