flight deck error rates are up to one every for minutes

They found an incredible rate of more than one error every four minutes.

This study, perhaps understandably, has not been published; it is referred to in a NASA Technical Memorandum. See Smith, A Simulator Study of the Interaction of Pilot Workload with Errors, Vigilance, and Decisions NASA TM 78482, Ames Research Center, Moffett Field, California, 1979

— 1984 📖 Normal Accidents

• ~ expect humans to make errors ↓