What was the purpose of the log book in Dahl's training?

The purpose of the log book in Dahl's training was primarily to document flight experiences. This tool served as a formal record where pilots would note details of their flights, including the dates, duration, and types of maneuvers performed. By maintaining a log book, pilots could track their progress, accumulate flight hours, and provide evidence of their qualifications and experiences for future reference or accountability.

The other options, while related to important aspects of aviation, do not capture the primary function of the log book in the context of Dahl's memoir. For example, while recording mechanical failures and aircraft repairs are vital for maintaining aircraft safety and performance, these duties are typically managed through separate maintenance logs or reports, rather than in a personal flight log. Similarly, weather reports are crucial for flight planning but are recorded elsewhere, rather than in a pilot's log book.