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Time pressure is another common source of slips. Studies of people performing a variety of tasks demonstrated a phenomenon called the speed-accuracy tradeoff. The more hurried one’s work becomes the more slips one is likely to make. Mistake
A mistake occurs when a person plans to do the wrong thing and is successful. Mistakes are errors of thought. Mistakes are sometimes the result of gaps or misconceptions in the student’s understanding. One type of mistake happens when a student formulates an understanding of a phenomenon and then later encounters a situation that shows how this understanding was incorrect or incomplete. For example, overly simplistic understanding of weather frequently leads inexperienced students into situations that are unexpected.
Experts are not immune to making mistakes, which sometimes arise from the way an expert draws upon knowledge of familiar problems and responds to them using familiar solutions. [Figure 2-21] Mistakes can occur when the expert categorizes a particular case incorrectly. For example, an experienced pilot may become accustomed to ignoring nuisance alerts issued by his traffic alerting system when approaching his home airport, as many aircraft on the ground turn on their transponders prior to takeoff. One night, he ignores an alert that was generated not by an aircraft on the ground, but rather by another aircraft that has turned in front of him on final approach. Reducing Error
Although it is impossible to eliminate errors entirely, there are ways to reduce them, as described in the following paragraphs. Learning and Practicing
The first line of defense against errors is learning and practice. Higher levels of knowledge and skill are associated with a lower frequency and magnitude of error.
Taking Time
Errors can often be reduced by working deliberately at a comfortable pace. Hurrying does not achieve the same results as faster performance that is gained by increasing one’s skill through continued practice.
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Checking for Errors
Another way to help avoid errors is to look actively for evidence of them. Many tasks in aviation offer a means of checking work. Students should be encouraged to look for new ways of checking their work. Using Reminders
Errors are reduced when visible reminders are present and actively used. Checklists and other published procedures are examples of reminders. Many aircraft instruments such as altimeters offer bugs that can be used to remind the pilot about assigned altitudes, airspeeds, headings, and courses. Mechanics and pilots alike can use notepads to jot down reminders or information that must otherwise be committed to memory. Developing Routines
The use of standardized procedures for routine tasks is widely known to help reduce error. Even when a checklist procedure is unavailable or impractical, students can help reduce the occurrence of error by adopting standardized procedures. Raising Awareness
Another line of defense against errors is to raise one’s awareness when operating in conditions under which errors are known to happen (e.g., changes in routine, time pressure), or in conditions under which defenses against errors have been compromised (e.g., fatigue, lack of recent practice). Error Recovery
Given that the occasional error is inevitable, it is a worthwhile exercise to practice recovering from commonly made errors, or those that pose serious consequences. All flight students are required to learn and practice a lost procedure to ensure that they can recover from the situation in which they have lost their way. It is useful to devote the same sort of preparation to other common student errors.
Learning From Error
Error can be a valuable learning resource. Students naturally make errors, which instructors can utilize to help students learn while being careful not to let the student practice doing the wrong thing. When a student makes an error, it is useful to ask the student to consider why the error happened, and what could be done differently to prevent the error from happening again in the future. In some cases, errors are slips that simply reveal the need for more practice. In other cases, errors point to aspects of student methods or habits that might be improved. For example, beginning instrument flight students commonly make errors when managing two communications radios, each with an active and standby frequency. When the same students learn to use each radio for a specific purpose (e.g., ATIS, ground, tower frequencies), error rates often drop quickly.
Instructors and students should be aware of a natural human tendency to resist learning from errors. That is, there is a tendency to “explain away” errors, dismissing them as one-time events that will likely never happen again. The same phenomenon occurs when observing errors made by others. Reading an accident or incident report, it is easy to spot where a pilot or mechanic made an error and regard the error as something that could never happen to the reader. It is important to note that this type of bias is not necessarily the result of ego or overconfidence; rather, it is something to which we are all susceptible. Psychologist Baruch Fischoff studied hindsight explanations given by people who were presented with descriptions of situations and their ultimate outcomes. When asked to provide explanations for events that had already occurred and for which the outcome was known, people explained that the outcomes were “obvious” and “predictable.” When the same events without the outcomes were presented to a second group, peoples’ prediction of the outcome was no better than chance guessing. The study nicely illustrates the popular adage that “hindsight is 20/20.”
　
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