Portal:Civil Aeronautics Board, Civil Air Regulations (1946)
“ The air carrier shall be responsible for qualifying each first pilot for the route over which he is to fly aircraft in scheduled air transportation as first pilot. Such qualification shall include a thorough knowledge of all of the instrument approach procedures, the terrain, any obstructions or congested areas, and the physical lay-out of the airport and approaches at each regular, provisional, refueling, and alternate airport approved for the route. ”
