Good and bad usability (week 9)
It is of utmost importance to make things easy to read and as foolproof as possible. It can be a decisive factor since many disasters can be avoided or happen because of that. 1) Air Inter Flight 148 crashed because of the small screen This disaster happened in 1992 because pilots practically descended into mountain. A two-year investigation concluded that ridiculously small display screen was most likely at fault. The pilots intended to descend toward the airport at an angle of -3.3 degrees, so they likely entered "-3.3" into the autopilot and proceeded with landing procedures. However the autopilot happened to be sent in the wrong mode of feet per minute instead of degrees. So those entered digits were interpreted as 3300 feet per minute - over four times faster than pilots originally intended. Autopilot display screen was simply a two-digit screen and it gave no hints as to what mode was actually used. Even the simplest alarm clocks have more safeguards! Another problem w...