THE HUMAN ERROR
7. Vibration: Riveting, as an example, has been found
to increase fatigue. Combine that with the noise and after a while some rivets begin to have “smiles” beside them. 8. Strong lighting: Strong lighting and, to a lesser
degree, weak lighting, brings on fatigue. We humans have a narrow range of conditions for optimal performance. 9. Boredom: It appears that if we are not stimulated, the brain begins to think that now is a good time to catch up on some sleep. Try driving on a straight stretch of road with no scenery change under a hot sun with the AC out. That is a recipe for the “head snaps” (involuntary microsleeps) to begin as fatigue sets in.
12. Dehydration: This is a source of fatigue that we usually don’t think about. If you wait until you’re thirsty, you’re already dehydrated and will be beginning to feel fatigued. The secret is to drink lots of water (within reason) and avoid the diuretics of coff ee, tea and alcohol. They may taste good, but do not quench thirst. In the next article we’ll discuss the eff ects, how to avoid them and provide the answers to the quiz questions.
10. Circadian rhythm: This is one of many rhythms within our body. Circadian comes from Latin and means “about a day.” If you look at the diagram you will see a line that starts at 0 hours (midnight) and dips down to a low between about 3 to 5 a.m. and rises to a peak at about 12 p.m.. This is a graph of your mental alertness in a 24-hour timeframe. It’s been discovered that our inner core body temperature follows along this same line, but I’ve added Bad Day when you come to work already tired. Aloha’s AMTs inspected those 1,300 rivets with the 140 cracks at exactly 3 to 5 a.m. after having worked during the day before starting their midnight shift. The next article will describe the eff ects of that low. 11. Low blood sugar: This will bring on fatigue, so the secret is to watch what you eat. As you become fatigued you begin to have more diffi culty controlling your blood sugar. Look at the graph and you will see that high carbohydrate food (yes, that donut or any candy bar) can result in a high blood sugar spike followed by an even lower blood sugar. Avoid the sugar foods, especially if you are tired.
Gordon Dupont worked as a special programs coordinator for Transport Canada from March 1993 to August 1999. He was responsible for coordinating with the aviation industry in the development of programs that would serve to reduce maintenance
error. He assisted in the development of Human Performance in Maintenance (HPIM) Parts 1 and 2. The “Dirty Dozen” maintenance Safety posters were an outcome of HPIM Part 1. Prior to working for Transport, Dupont worked for seven years as a technical investigator for the Canadian Aviation Safety Board (later to become the Canadian Transportation Safety Board). He saw fi rsthand the tragic results of maintenance and human error.
Dupont has been an aircraft maintenance engineer and commercial pilot in Canada, the United States and Australia. He is the past president and founding member of the Pacifi c Aircraft Maintenance Engineers Association. He is a founding member and a board member of the Maintenance and Ramp Safety Society (MARSS). Dupont, who is often called “The Father of the Dirty Dozen,” has provided human factors training around the world. He retired from Transport Canada in 1999 and is now a private consultant. He is interested in any work that will serve to make our industry safer. Visit
www.system-safety.com for more information.
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