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Department of Commerce 
Civil Aeronautics Administration

Jackson Heights, L.I., N.Y.
January 23, 1942

Mr. F.L Duncan 
Vice Pres. in charge of Operations
Canadian Colonial Airways
LaGuardia Field, New York 

Dear Sir: 
Recent events make it necessary to place a procedure into effect which will make it impractical for the enemy to use our radio range stations for navigational purposes. Also, it has become necessary to formulate a system to handle the evacuation of aircraft from areas within which an impending attack is expected to take place. Under actual conditions the time to accomplish the necessary action might conceivably be only a very few minutes. In view of these circumstances, emergency procedures must be placed into effect immediately by Civil Aeronautics Administration personnel. 

The following excerpts are taken from general instructions issued to the airway traffic control centers of this region, and concern emergency shut-down procedures for radio range facilities. You will also find attached a copy of Civil Aeronautics Administration Communications Circular 1C-33, which covers the air raid warning communications procedures: 

"Civil Aeronautics Administration personnel have been assigned to Army Information Centers at the following locations: Boston, New York, Philadelphia and are on duty 24 hours a day in these Information Centers. They will handle all communications or instructions issues by Army personnel which affect operation of Civil Aeronautics Administration communications or airway traffic control facilities. It is emphasized that only those persons designated as CAA liaison officers in Army Information Centers are authorized to accept instructions from military personnel regarding the suspension or resumption of operation of Civil Aeronautics Administration traffic control or Communications facilities of the First Region. 

"Civil Aeronautics Administration liaison officers upon being informed by military personnel to suspend operation of radio facilities, shall immediately relay this information to the lisison officer in the New York Army Information Center. The New York liaison officer thereupon will immediately contact the New York Airway Traffic Control Center and transmit the raid alarm message. Upon receipt of the raid alarm message from the Army Information Center, personnel of the New York Airway Traffic Control Center shall immediately accomplish the following actions: