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 Airways Division of the Bureau of Lighthouses, the Airway Mapping Section of the Coast and Geodetic Survey, and the Aeronautical Research Division of the Bureau of Standards, are collectively referred to as the Aeronautics Branch of the Department.

"The work of the Air Regulations Division includes the inspection of aircraft for airworthiness and their registration as aircraft of the United States; the examination and licensing of airmen serving in connection with licensed aircraft; the identification by letter and number of all aircraft, including those not licensed; the investigation of accidents and the enforcement of air traffic rules. . ..

"It is contemplated that practically all new production aircraft will be manufactured under what is known as an approved type certificate. In order to secure such a certificate the manufacturer submits to the Air Regulation Division plans and specifications with a stress analysis.