About ASRI®

Aviation Spectrum Resources, Inc. (ASRI) is responsible for managing the Aeronautical Enroute VHF Spectrum 128.825 – 132.00 MHz and 136.500 – 136.975 MHz and the Long Distance Operational Control (LDOC) HF spectrum in the United States. This Aeronautical Enroute spectrum is used by aircraft operators to fulfill their requirements for Aeronautical Operational Control communications.

Management of these spectrum resources includes coordinating and licensing of over 5000 ground stations; 200 new assignments; 200 modifications and 1000 license renewals per year.

ASRI’s frequency management selects frequencies and holds licenses for use by airlines and other aircraft operators for use in operational control of aircraft. Frequency Management has developed computer programs which analyze current frequency assignments recorded in a master database to obtain a “first cut” list of candidate frequencies available for assignment to meet a new requirement. The list is then analyzed by displaying each candidate frequency on a map showing the target location, all other co-channel assignments and their coordinated altitudes, the approximate radio range for the requested coordination altitude, and the international coordination zone contours.

ASRI participates in International Telecommunications Union (ITU) and International Civil Aviation Organization (ICAO) panels and working groups in matters related to radio spectrum. ASRI also works closely with the FCC and FAA in formulation of U.S. positions for the World Radio Conference (WRC).

ASRI functions as the International SELCAL Registrar on behalf of the International Civil Aviation Organization (ICAO). This includes responsibility for the worldwide assignment of SELCAL codes and management of the SELCAL database containing approximately 27,300 SELCAL assignments for 4300 registrants as of April 2010.

ASRI provides staff support for the Aeronautical Frequency Committee (AFC). The AFC develops and recommends radio spectrum policy and Industry positions regarding regulatory actions to the ASRI Board of Directors. The AFC is composed of the major USA passenger and cargo air carriers, the National Business Aviation Association (NBAA), Helicopter Association International (HAI), and the Aircraft Owners and Pilots Association (AOPA) with observers from the Federal Aviation Administration (FAA) the Air Transport Association (ATA), and the International Air Transport Association (IATA).

For more information and instruction, please refer to the ASRI Aeronautical Ground Station Manual.

For more information, specific requests or to get answers to your questions, please submit a Service Request Form.