Sec. 1.952  How file numbers are assigned.

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    (b) File number symbols and service or class of station designators:

                      Amateur and Disaster Services

Y--Amateur
D--Disaster
R--Races

                            Aviation Services

A--Aeronautical and fixed group
AA--Aviation auxiliary group
AR--Aviation radionavigation land
AC--Civil Air Patrol

                         Personal Radio Services

CA--General Mobile Radio Service
ZA-General Mobile Radio Service
ZV-Interactive Video and Data Service

                           Industrial Services

IB--Business
IF--Forest products
IX--Manufacturers
IM--Motion picture
IP--Petroleum
IY--Relay press
IS--Special industrial
IT--Telephone maintenance
IW--Power

                      Land Transportation Services

LA--Automobile emergency
LI--Interurban passenger
LJ--Interurban property
LR--Railroad
LX--Taxicab
LU--Urban passenger
LV--Urban property

                             Marine Services

MK--Alaskan group
M--Coastal group
MA--Marine auxiliary group
MR--Marine radiodetermination land

                           Microwave Services

OF--Private Operational-Fixed Microwave

                         Public Safety Services

PF--Fire
PO--Forestry conservation

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PH--Highway maintenance
PL--Local government
PP--Police
PS--Special emergency

                          Radiolocation Service

RS--Radiolocation

                            800 MHz Services

GB--Conventional Business
GO--Conventional Industrial/Land Transportation
GP--Conventional Public Safety/Special Emergency
GX--Conventional Commercial (SMRS)
YB--Trunked Business
YO--Trunked Industrial/Land Transportation
YP--Trunked Public Safety/Special Emergency
YX--Trunked Commercial (SMRS)

                         900 MHz Paging Services

GS--Private carrier paging systems

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