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By the Leeham News Team

Dec. 6, 2021, © Leeham News: Long ago, aircraft were simple, made of steel tubing, wood, and fabric. Engineering staffs were small, and the craftsmen building them had little need for specific production planning instructions because they were very simple. This was the work environment

Boeing Model 40 at the Museum of Flight, Seattle.

when CAM4B and CAM 18, the Civil Aeronautics Board Manual 4b and 18, described how aircraft were designed, certified, built, and maintained. Think of Ford Trimotors, Fokker F10, Boeing Model 40s and 80s, and Lockheed Vegas. It was the golden age of air transport.