Heinrich's law is a principle derived from statistical analysis of safety records by the American insurance company, Travelers, in the 1920s. It states that "for every major accident, there are 29 minor accidents and 300 near-miss incidents." In other words, there are numerous small incidents and near-misses that precede major accidents. This concept is often referred to as the "iceberg theory of accidents" and highlights the importance of focusing on small incidents and near-misses as a way to prevent major accidents from happening.
Heinrich's law also suggests that human factors play a significant role in the occurrence of accidents. Specifically, there are three types of human factors: violations (non-compliance), errors (mistakes in judgment or operation), and lack of knowledge (inadequate skills or training).
Heinrich's law continues to be an important concept in the field of safety, providing guidance on how to prevent accidents by focusing on small incidents and near-misses, and identifying and addressing the human factors that contribute to accidents.
The business trip is already approaching tomorrow. I will fly from Seattle to Haneda (Tokyo, Japan) on tomorrow's noon flight. This time it's DELTA 167, but I'm thinking about ANA for the next time, as ANA will return to Haneda not Narita (Chiba, Japan). JAL is also good, but Narita seems far away. DELTA uses Airbus 330-900, but ANA and JAL use Boeing 787. Both are good aircraft, but the 330-900 feels slightly newer in terms of equipment. Now, I go home and get ready for tomorrow's business trip. I'm off. (To everyone in Japan, see you soon.)