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ABM1 • 7

ATIS, is a repeated broadcast about basic weather information, runways in

use, and any special information such as closed taxiways or runways.

ASOS/AWOS – Automated Surface Observing System/Automated Weather

Observing System

This system is similar to ATIS but usually located at un-towered airports.

Approach Control & Departure Control

These air traffic radar controllers coordinate all flight operations in the vicinity

of busy metropolitan airport areas.

ARTCC – Air Route Traffic Control Center

When you hear a pilot talking with "Jacksonville Center" or "Indianapolis Cen-

ter", you know the aircraft is really en route on a flight rather than just leaving

or just approaching a destination. A pilot will be in touch with several different

"Regional Centers" during a cross-country flight.

CTAF – Common Traffic Advisory Frequency

Airports without control towers are controlled by the pilots themselves and

they rely on the local CTAF frequency dedicated only to advisory communica-

tions between pilots and ground personnel such as fuel service operators. The

people on the ground can advise the pilot on the status of incoming or outgo-

ing aircraft, but the pilot remains responsible for landing and takeoff decisions.

Typical CTAF frequencies are 122.7, 122.8 and 123.0 MHz. Unicom frequen-

cies used at manned, towered airports for day to day business are 122.75,

122.85, and 122.95 MHz.

FSS - FAA Flight Service Stations

The FAA's network of Flight Service Stations keeps track of flight plans and

provides weather briefings and other services to pilots. Some advisory radio

communication takes place between pilots and a regional "FSS". If there is an

FSS in your local area but no airport control towers, the FSS radio frequency

will stay interesting. Typical frequencies are 122.1, 122.6, and 123.6 MHz.

Pilots always address the FSS by calling the FSS name followed by “Radio”.

ELT – Emergency Locator Transmitters

Emergency and guard channels are used by airplanes in flight operations dur-

ing an emergency or talking on official business. This can be heard on

121.5MHz.

ACARS - Aircraft Communication Addressing and Reporting System

ACARS is a digital VHF radio data link which allows airline flight operations

departments to communicate with the various aircraft in their fleet. ACARS is

used by many civilian and business aircraft and is similar to “email for air-

planes,". Each aircraft has its own unique address in the system. Traffic is

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