47 CFR 87.171: Class of station symbols.

The two or three letter symbols for the classes of station in the aviation services are:

Symbol and class of station

AX—Aeronautical fixed

AVW—Audio visual warning systems

AXO—Aeronautical operational fixed

DGP—Differential GPS

DLT—Aircraft data link land test

FA—Aeronautical land (unspecified)

FAC—Airport control tower

FAE—Aeronautical enroute

FAM—Aeronautical multicom

FAR—Aeronautical search and rescue

FAS—Aviation support

FAT—Flight test

FAU—Aeronautical advisory (unicom)

FAW—Automatic weather observation

GCO—Ground Communication Outlet

MA—Aircraft (Air carrier and Private)

MA1—Air carrier aircraft only

MA2—Private aircraft only

MOU—Aeronautical utility mobile

MRT—ELT test

RCO—Remote Communications Outlet

RL—Radionavigation land (unspecified)

RLA—Marker beacon

RLB—Radiobeacon

RLD—RADAR/TEST

RLG—Glide path

RLL—Localizer

RLO—VHF omni-range

RLS—Surveillance radar

RLT—Radionavigation land test

RLW—Microwave landing system

RNV—Radio Navigation Land/DME

RPC—Ramp Control

TJ—Aircraft earth station in the Aeronautical Mobile-Satellite Service

UAT—Universal Access Transceiver