42% of errors from human administrator errors.
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J. Gray. Why Do Computers Stop and What Can Be Done About It? Symposium on Reliability in Distributed
Software and Database Systems, 3–12, 1986.
"A major observation from the field of human error research, labeled the Automation Irony, is that automation does not cure human error. The reasoning is that once designers realize that humans make errors, they often try to design a system that reduces human intervention. Automation usually addresses the easy tasks for humans, leaving to the operator the complex, rare tasks that were not successfully automated. Humans, who are not good at solving problems from first principles, are ill suited to such tasks, especially under stress. The irony is that automation reduces the chance for operators to get hands-on control experience, preventing them from building mental production rules and models for troubleshooting. Thus, automation often decreases system visibility, increases system complexity, and limits opportunities for interaction, all of which can make it harder for operators to use and make it more likely for them to make mistakes.
Our lessons from human error research are that human operators will always be involved with systems
and that humans will make errors, even when they truly know what to do. The challenge is to design
systems that are synergistic with human operators, ideally giving operators a chance to familiarize
themselves with systems in a safe environment, and to correct their own errors.
http://en.wikipedia.org/wiki/Pilot_error
One of the most famous incidents of an aircraft disaster attributed to pilot error was the night time crash ofEastern Air Lines Flight 401 near Miami, Florida on December 29, 1972. The captain, first officer, and flight engineer had become fixated on a faulty landing gear light and had failed to realize that the flight controls had been bumped by one of the crew altering the autopilot settings from level flight to a slow descent. Told by ATC to hold over a sparsely populated area away from the airport while they dealt with the problem (with, as a result, very few lights on the ground visible to act as an external reference), the distracted flight crew did not notice the plane losing height and the aircraft eventually struck the ground in the Everglades, killing 101 out of 176 passengers and crew.
During 2004 in the United States, pilot error was listed as the primary cause of 78.6% of fatal general aviation accidents, and as the primary cause of 75.5% of general aviation accidents overall.[4] Forscheduled air transport, pilot error typically accounts for just over half of worldwide accidents with a known cause.[5]
- 12 October 1997 – Singer John Denver died when his newly-bought Rutan Long-EZ home-built aircraft crashed into the Pacific Ocean off Pacific Grove, California. The NTSB indicated that Denver lost control of the aircraft while attempting to manipulate the fuel selector handle, which had been placed in a hard-to-reach position by the aircraft's builder. The NTSB cited his unfamiliarity with the aircraft's design as a cause of the crash.
- 4 August 2005 – the pilots of Helios Airways Flight 522 lost consciousness, most likely due to hypoxiacaused by failure to switch the cabin pressurization to "Auto" during the pre-flight preparations. TheBoeing 737-300 crashed after running out of fuel, killing all on board.
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