1879:
1889:
1868:
1899:
80:
is active. UNICOM stations typically use a single communications frequency. Some airfields always offer UNICOM service while others revert to UNICOM procedures only during hours when the control tower is closed. Under this protocol, aircraft may call a non-government ground station to make
89:
frequency, which is often the same as the UNICOM frequency. When a part-time UNICOM station is located on the same airport as a part-time control tower, the same frequency will be used by both ground stations to avoid confusion. Many UNICOM stations are nowadays operated by a
81:
announcements of their intentions. Pilots who join the frequency later can request field advisories, which may include "weather information, wind direction, the recommended runway" and any previously reported traffic.
309:
84:
In some cases, the ground station is not staffed, and attempts to communicate will, of course, receive no acknowledgement. During these times, pilots self-announce their position and/or intentions over the
257:
64:, abbreviated as AFIS or FIS. From an ICAO perspective, UNICOM, historically most commonly provided by flight service stations, is an implementation of FIS.
1143:
377:
1851:
1823:
1818:
843:
397:
94:(FBO), and it may be possible to request services such as fuel trucks, taxi service from the airport, outgoing phone calls, and others.
283:
Air
Traffic Organization Policy ORDER #JO 7210.3X; Subject: Facility Operation and Administration, Section 2 - Use of Communications.
314:
Omar
Alfonso. La Perla del Sur. Ponce, Puerto Rico. 23 February 2013. Retrieved 26 February 2013 (Printed edition publication data:
352:
447:
1845:
348:
1840:
1830:
1810:
1612:
687:
329:"FAA Aeronautical Information Manual (FAA AIM) - 4-1-9.e. Information Provided by aueronautical Advisory Stations (UNICOM)"
60:
977:
1902:
1835:
1681:
697:
258:"TP 14371 - Transport Canada Aeronautical Information Manual (TC AIM) - RAC - 1.0 GENERAL 1.2.1 Universal Communications"
1607:
261:
1701:
750:
558:
127:
1933:
1486:
1034:
836:
296:
1597:
286:
U.S. DEPARTMENT OF TRANSPORTATION, FEDERAL AVIATION ADMINISTRATION. 9 February 2012. Retrieved 26 February 2013.
1592:
1617:
667:
510:
1923:
1892:
1653:
1550:
1093:
888:
860:
548:
495:
1882:
1389:
829:
717:
563:
440:
1741:
1663:
1602:
1309:
755:
58:, with these terms being used mostly in the Americas. The equivalent European/ICAO service is known as
328:
1513:
1474:
1319:
1219:
1148:
1081:
908:
780:
611:
573:
1872:
1114:
1049:
1002:
962:
805:
621:
281:
111:
1711:
1696:
1540:
1491:
1414:
1314:
992:
878:
873:
765:
712:
515:
1633:
1419:
1234:
1179:
1174:
987:
952:
475:
433:
134:
1535:
1339:
1304:
1224:
1204:
1126:
1014:
935:
770:
868:
1449:
1409:
1379:
1136:
1071:
893:
775:
626:
490:
485:
8:
1459:
1399:
1158:
1120:
918:
903:
810:
657:
543:
480:
411:
382:
NASA ASRS Report 106369, March 1989. 37000 Feet. August 2007. Retrieved 26 February 2013.
107:
91:
47:
43:
356:
1686:
1643:
1574:
1444:
1374:
1349:
1284:
1131:
852:
400:
1928:
1726:
1648:
1562:
1545:
1508:
1354:
1184:
1153:
1019:
913:
677:
1394:
1731:
1691:
1671:
1638:
1567:
1525:
1439:
1294:
1279:
1254:
1229:
1189:
1039:
898:
883:
662:
253:
73:
1359:
1214:
982:
957:
945:
795:
745:
103:
102:
The actual frequency used at any particular airport can be found on the relevant
1557:
1429:
1404:
1364:
1334:
1209:
1044:
997:
972:
930:
616:
419:
379:
FBO at small airport using unassigned unicom frequency for airport information.
1917:
1706:
1479:
1469:
1384:
1274:
1269:
1259:
1244:
1066:
925:
631:
601:
470:
456:
123:
77:
24:
1584:
1424:
1369:
1299:
1264:
1199:
1098:
1088:
940:
707:
606:
596:
28:
1784:
1434:
1344:
1329:
1289:
1249:
1108:
800:
790:
785:
20:
1789:
1496:
1194:
1103:
1059:
1029:
1007:
347:
1774:
1239:
1054:
821:
760:
145:
Airports without an Air
Traffic Control tower or FSS on the airport.
42:) station is an air-ground communication facility operated by a non-
1769:
1759:
1676:
1501:
1324:
702:
647:
568:
229:
1764:
1749:
967:
722:
652:
553:
500:
51:
50:
and to provide various non-flight services, such as requesting a
425:
1794:
1754:
1076:
727:
692:
525:
520:
505:
177:
1779:
1716:
1024:
316:
Recortes en la FAA: Fuera de peligro el
Aeropuerto Mercedita.
1721:
224:
86:
72:
UNICOM is employed at airports with a low volume of
54:, even at towered airports. It is also known as an
318:Year 31. Issue 1526. Page 14. 27 February 2013.).
180:, the radio frequencies assigned for UNICOM are:
1915:
252:
133:Airports with an Air Traffic Control tower or
46:private agency to provide advisory service at
837:
441:
1852:Global telecommunications regulation bodies
1888:
844:
830:
448:
434:
126:, radio frequencies made available by the
392:
390:
388:
248:
246:
244:
110:or in airport directories, such as the
1916:
851:
385:
349:Aircraft Owners and Pilots Association
311:Fuera de peligro aeropuerto Mercedita.
61:(aerodrome) flight information service
825:
429:
422:: Superintendent of Documents, 1999).
321:
1898:
241:
48:uncontrolled aerodromes and airports
13:
14:
1945:
559:Common traffic advisory frequency
455:
128:Federal Communications Commission
16:Air-ground communication facility
1897:
1887:
1878:
1877:
1866:
1487:Free-space optical communication
297:"FAA Flight Information service"
117:
371:
341:
303:
289:
275:
137:(Alaska only) on the airport.
97:
67:
1:
668:Maritime mobile amateur radio
353:"Changing Unicom Frequencies"
235:
56:aeronautical advisory station
1873:Telecommunication portal
1654:Telecommunications equipment
811:Voting (diversity combining)
549:Aircraft emergency frequency
496:General Mobile Radio Service
7:
1390:Alexander Stepanovich Popov
564:Mandatory frequency airport
416:Airman's Information Manual
218:
10:
1950:
1094:Telecommunications history
756:Automatic vehicle location
18:
1861:
1803:
1740:
1702:Public Switched Telephone
1662:
1626:
1583:
1524:
1514:telecommunication circuit
1475:Fiber-optic communication
1458:
1220:Francis Blake (telephone)
1167:
1015:Optical telecommunication
859:
781:Dynamic range compression
736:
698:Dual-tone multi-frequency
676:
640:
612:Professional mobile radio
587:
574:Single Frequency Approach
534:
463:
171:
1613:Orbital angular-momentum
1050:Satellite communications
889:Communications satellite
806:Radiotelephony procedure
622:Specialized Mobile Radio
112:Canada Flight Supplement
40:universal communications
1934:Aviation communications
1492:Molecular communication
1315:Gardiner Greene Hubbard
1144:Undersea telegraph line
879:Cable protection system
516:Multi-Use Radio Service
130:for use as UNICOM are:
1634:Communication protocol
1420:Charles Sumner Tainter
1235:Walter Houser Brattain
1180:Edwin Howard Armstrong
988:Information revolution
588:Land-based commercial
476:Amateur radio repeater
1608:Polarization-division
1340:Narinder Singh Kapany
1305:Erna Schneider Hoover
1225:Jagadish Chandra Bose
1205:Alexander Graham Bell
936:online video platform
590:and government mobile
537:(aeronautical mobile)
76:traffic and where no
1450:Vladimir K. Zworykin
1410:Almon Brown Strowger
1380:Charles Grafton Page
1035:Prepaid mobile phone
963:Electrical telegraph
627:Trunked radio system
491:Public Radio Service
486:Family Radio Service
464:Amateur and hobbyist
19:For other uses, see
1924:Air traffic control
1400:Johann Philipp Reis
1159:Wireless revolution
1121:The Telephone Cases
978:Hydraulic telegraph
658:Coast radio station
544:Air traffic control
481:Citizens band radio
412:Air Traffic Control
351:(15 October 2018).
108:terminal area chart
92:fixed-base operator
44:air traffic control
1598:Frequency-division
1575:Telephone exchange
1445:Charles Wheatstone
1375:Jun-ichi Nishizawa
1350:Innocenzo Manzetti
1285:Reginald Fessenden
1020:Optical telegraphy
853:Telecommunications
641:Marine (shipboard)
526:UHF CB (Australia)
1911:
1910:
1649:Store and forward
1644:Data transmission
1558:Network switching
1509:Transmission line
1355:Guglielmo Marconi
1320:Internet pioneers
1185:Mohamed M. Atalla
1154:Whistled language
819:
818:
680:Selective calling
1941:
1901:
1900:
1891:
1890:
1881:
1880:
1871:
1870:
1869:
1742:Notable networks
1732:Wireless network
1672:Cellular network
1664:Types of network
1639:Computer network
1526:Network topology
1440:Thomas A. Watson
1295:Oliver Heaviside
1280:Philo Farnsworth
1255:Daniel Davis Jr.
1230:Charles Bourseul
1190:John Logie Baird
899:Data compression
894:Computer network
846:
839:
832:
823:
822:
737:System elements
663:Marine VHF radio
450:
443:
436:
427:
426:
404:
403:
394:
383:
375:
369:
368:
366:
364:
355:. Archived from
345:
339:
338:
336:
335:
325:
319:
307:
301:
300:
293:
287:
279:
273:
272:
270:
269:
260:. Archived from
254:Transport Canada
250:
214:123.500 MHz
211:123.350 MHz
208:123.300 MHz
205:123.000 MHz
202:122.950 MHz
199:122.825 MHz
196:122.800 MHz
193:122.775 MHz
190:122.750 MHz
187:122.725 MHz
184:122.700 MHz
167:123.075 MHz
164:123.050 MHz
161:123.000 MHz
158:122.975 MHz
155:122.800 MHz
152:122.725 MHz
149:122.700 MHz
141:122.950 MHz
74:general aviation
1949:
1948:
1944:
1943:
1942:
1940:
1939:
1938:
1914:
1913:
1912:
1907:
1867:
1865:
1857:
1799:
1736:
1658:
1622:
1579:
1528:
1520:
1461:
1454:
1360:Robert Metcalfe
1215:Tim Berners-Lee
1163:
983:Information Age
855:
850:
820:
815:
796:Rayleigh fading
738:
732:
679:
672:
636:
589:
583:
536:
530:
459:
454:
407:
396:
395:
386:
376:
372:
362:
360:
359:on 5 April 2013
346:
342:
333:
331:
327:
326:
322:
308:
304:
295:
294:
290:
280:
276:
267:
265:
251:
242:
238:
221:
174:
120:
100:
70:
32:
17:
12:
11:
5:
1947:
1937:
1936:
1931:
1926:
1909:
1908:
1906:
1905:
1895:
1885:
1875:
1862:
1859:
1858:
1856:
1855:
1848:
1843:
1838:
1833:
1828:
1827:
1826:
1821:
1813:
1807:
1805:
1801:
1800:
1798:
1797:
1792:
1787:
1782:
1777:
1772:
1767:
1762:
1757:
1752:
1746:
1744:
1738:
1737:
1735:
1734:
1729:
1724:
1719:
1714:
1709:
1704:
1699:
1694:
1689:
1684:
1679:
1674:
1668:
1666:
1660:
1659:
1657:
1656:
1651:
1646:
1641:
1636:
1630:
1628:
1624:
1623:
1621:
1620:
1615:
1610:
1605:
1600:
1595:
1593:Space-division
1589:
1587:
1581:
1580:
1578:
1577:
1572:
1571:
1570:
1565:
1555:
1554:
1553:
1543:
1538:
1532:
1530:
1522:
1521:
1519:
1518:
1517:
1516:
1506:
1505:
1504:
1494:
1489:
1484:
1483:
1482:
1472:
1466:
1464:
1456:
1455:
1453:
1452:
1447:
1442:
1437:
1432:
1430:Camille Tissot
1427:
1422:
1417:
1412:
1407:
1405:Claude Shannon
1402:
1397:
1395:Tivadar Puskás
1392:
1387:
1382:
1377:
1372:
1367:
1365:Antonio Meucci
1362:
1357:
1352:
1347:
1342:
1337:
1335:Charles K. Kao
1332:
1327:
1322:
1317:
1312:
1310:Harold Hopkins
1307:
1302:
1297:
1292:
1287:
1282:
1277:
1272:
1267:
1262:
1257:
1252:
1247:
1242:
1237:
1232:
1227:
1222:
1217:
1212:
1210:Emile Berliner
1207:
1202:
1197:
1192:
1187:
1182:
1177:
1171:
1169:
1165:
1164:
1162:
1161:
1156:
1151:
1149:Videotelephony
1146:
1141:
1140:
1139:
1134:
1124:
1117:
1112:
1106:
1101:
1096:
1091:
1086:
1085:
1084:
1079:
1074:
1064:
1063:
1062:
1052:
1047:
1045:Radiotelephone
1042:
1037:
1032:
1027:
1022:
1017:
1012:
1011:
1010:
1000:
995:
990:
985:
980:
975:
970:
965:
960:
955:
950:
949:
948:
943:
938:
933:
931:Internet video
923:
922:
921:
916:
911:
906:
896:
891:
886:
881:
876:
871:
865:
863:
857:
856:
849:
848:
841:
834:
826:
817:
816:
814:
813:
808:
803:
798:
793:
788:
783:
778:
773:
768:
763:
758:
753:
748:
742:
740:
739:and principles
734:
733:
731:
730:
725:
720:
715:
710:
705:
700:
695:
690:
684:
682:
674:
673:
671:
670:
665:
660:
655:
650:
644:
642:
638:
637:
635:
634:
629:
624:
619:
617:Radio repeater
614:
609:
604:
599:
593:
591:
585:
584:
582:
581:
576:
571:
566:
561:
556:
551:
546:
540:
538:
532:
531:
529:
528:
523:
518:
513:
508:
503:
498:
493:
488:
483:
478:
473:
467:
465:
461:
460:
453:
452:
445:
438:
430:
424:
423:
420:Washington, DC
406:
405:
384:
370:
340:
320:
302:
288:
274:
256:(April 2010).
239:
237:
234:
233:
232:
227:
220:
217:
216:
215:
212:
209:
206:
203:
200:
197:
194:
191:
188:
185:
173:
170:
169:
168:
165:
162:
159:
156:
153:
150:
143:
142:
119:
116:
99:
96:
69:
66:
15:
9:
6:
4:
3:
2:
1946:
1935:
1932:
1930:
1927:
1925:
1922:
1921:
1919:
1904:
1896:
1894:
1886:
1884:
1876:
1874:
1864:
1863:
1860:
1853:
1849:
1847:
1844:
1842:
1839:
1837:
1834:
1832:
1829:
1825:
1822:
1820:
1817:
1816:
1814:
1812:
1809:
1808:
1806:
1802:
1796:
1793:
1791:
1788:
1786:
1783:
1781:
1778:
1776:
1773:
1771:
1768:
1766:
1763:
1761:
1758:
1756:
1753:
1751:
1748:
1747:
1745:
1743:
1739:
1733:
1730:
1728:
1725:
1723:
1720:
1718:
1715:
1713:
1710:
1708:
1705:
1703:
1700:
1698:
1695:
1693:
1690:
1688:
1685:
1683:
1680:
1678:
1675:
1673:
1670:
1669:
1667:
1665:
1661:
1655:
1652:
1650:
1647:
1645:
1642:
1640:
1637:
1635:
1632:
1631:
1629:
1625:
1619:
1618:Code-division
1616:
1614:
1611:
1609:
1606:
1604:
1603:Time-division
1601:
1599:
1596:
1594:
1591:
1590:
1588:
1586:
1582:
1576:
1573:
1569:
1566:
1564:
1561:
1560:
1559:
1556:
1552:
1549:
1548:
1547:
1544:
1542:
1539:
1537:
1534:
1533:
1531:
1529:and switching
1527:
1523:
1515:
1512:
1511:
1510:
1507:
1503:
1500:
1499:
1498:
1495:
1493:
1490:
1488:
1485:
1481:
1480:optical fiber
1478:
1477:
1476:
1473:
1471:
1470:Coaxial cable
1468:
1467:
1465:
1463:
1457:
1451:
1448:
1446:
1443:
1441:
1438:
1436:
1433:
1431:
1428:
1426:
1423:
1421:
1418:
1416:
1413:
1411:
1408:
1406:
1403:
1401:
1398:
1396:
1393:
1391:
1388:
1386:
1385:Radia Perlman
1383:
1381:
1378:
1376:
1373:
1371:
1368:
1366:
1363:
1361:
1358:
1356:
1353:
1351:
1348:
1346:
1343:
1341:
1338:
1336:
1333:
1331:
1328:
1326:
1323:
1321:
1318:
1316:
1313:
1311:
1308:
1306:
1303:
1301:
1298:
1296:
1293:
1291:
1288:
1286:
1283:
1281:
1278:
1276:
1275:Lee de Forest
1273:
1271:
1270:Thomas Edison
1268:
1266:
1263:
1261:
1260:Donald Davies
1258:
1256:
1253:
1251:
1248:
1246:
1245:Claude Chappe
1243:
1241:
1238:
1236:
1233:
1231:
1228:
1226:
1223:
1221:
1218:
1216:
1213:
1211:
1208:
1206:
1203:
1201:
1198:
1196:
1193:
1191:
1188:
1186:
1183:
1181:
1178:
1176:
1173:
1172:
1170:
1166:
1160:
1157:
1155:
1152:
1150:
1147:
1145:
1142:
1138:
1135:
1133:
1130:
1129:
1128:
1125:
1123:
1122:
1118:
1116:
1113:
1110:
1107:
1105:
1102:
1100:
1097:
1095:
1092:
1090:
1089:Smoke signals
1087:
1083:
1080:
1078:
1075:
1073:
1070:
1069:
1068:
1067:Semiconductor
1065:
1061:
1058:
1057:
1056:
1053:
1051:
1048:
1046:
1043:
1041:
1038:
1036:
1033:
1031:
1028:
1026:
1023:
1021:
1018:
1016:
1013:
1009:
1006:
1005:
1004:
1001:
999:
996:
994:
991:
989:
986:
984:
981:
979:
976:
974:
971:
969:
966:
964:
961:
959:
956:
954:
951:
947:
944:
942:
939:
937:
934:
932:
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926:Digital media
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632:Walkie-talkie
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457:Two-way radio
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264:on 2010-07-09
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124:United States
118:United States
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78:control tower
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37:
30:
26:
25:UNICOM Global
22:
1585:Multiplexing
1460:Transmission
1425:Nikola Tesla
1415:Henry Sutton
1370:Samuel Morse
1300:Robert Hooke
1265:Amos Dolbear
1200:John Bardeen
1119:
1099:Telautograph
1003:Mobile phone
958:Edholm's law
941:social media
874:Broadcasting
718:Quik-Call II
708:Push-to-talk
678:Signaling /
607:Mobile radio
597:Base station
578:
415:
410:"Chapter 4:
378:
373:
361:. Retrieved
357:the original
343:
332:. Retrieved
323:
315:
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305:
291:
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277:
266:. Retrieved
262:the original
175:
144:
132:
121:
101:
83:
71:
59:
55:
39:
35:
33:
29:China Unicom
1785:NPL network
1497:Radio waves
1435:Alfred Vail
1345:Hedy Lamarr
1330:Dawon Kahng
1290:Elisha Gray
1250:Yogen Dalal
1175:Nasir Ahmed
1109:Teleprinter
973:Heliographs
801:Tone remote
791:Link budget
786:Fade margin
713:Quik-Call I
398:47 CFR
363:26 February
98:Frequencies
68:Description
21:Unicom Corp
1918:Categories
1831:Antarctica
1790:Toasternet
1712:Television
1195:Paul Baran
1127:Television
1111:(teletype)
1104:Telegraphy
1082:transistor
1060:Phryctoria
1030:Photophone
1008:Smartphone
998:Mass media
511:Mobile rig
334:2012-07-21
268:2010-08-19
236:References
1815:Americas
1804:Locations
1775:Internet2
1536:Bandwidth
1240:Vint Cerf
1137:streaming
1115:Telephone
1055:Semaphore
946:streaming
771:DC remote
761:Call sign
535:Aviation
104:sectional
1929:Airbands
1883:Category
1770:Internet
1760:CYCLADES
1677:Ethernet
1627:Concepts
1551:terminal
1502:wireless
1325:Bob Kahn
1168:Pioneers
993:Internet
884:Cable TV
776:Dispatch
703:MDC-1200
648:2182 kHz
569:MULTICOM
230:MULTICOM
219:See also
1903:Commons
1893:Outline
1846:Oceania
1765:FidoNet
1750:ARPANET
1563:circuit
1132:digital
861:History
746:Antenna
723:Selcall
653:500 kHz
554:Airband
501:KDR 444
122:In the
1841:Europe
1811:Africa
1795:Usenet
1755:BITNET
1692:Mobile
1568:packet
1077:MOSFET
1072:device
869:Beacon
728:SELCAL
693:D-STAR
579:UNICOM
521:PMR446
506:LPD433
401:87.217
178:Canada
172:Canada
36:UNICOM
27:, and
1824:South
1819:North
1780:JANET
1717:Telex
1707:Radio
1546:Nodes
1541:Links
1462:media
1040:Radio
1025:Pager
953:Drums
919:video
914:image
904:audio
688:CTCSS
1836:Asia
1722:UUCP
1682:ISDN
751:APRS
365:2013
225:CTAF
87:CTAF
52:taxi
1727:WAN
1697:NGN
1687:LAN
968:Fax
909:DCT
766:CAD
414:,"
176:In
135:FSS
1920::
387:^
243:^
114:.
106:,
34:A
23:,
1854:)
1850:(
845:e
838:t
831:v
449:e
442:t
435:v
418:(
367:.
337:.
299:.
271:.
38:(
31:.
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