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3-46
Rev 1
The frequencies associated with CL B, CL C, TRSA,
CTA, or TMA are VFR frequencies. Airports which have
one of these categories of frequencies also have APR
and DEP which are IFR frequencies.
Where required, APR, DEP, CL B, CL C, TRSA, CTA,
and TMA frequencies are sectorized. That is, a fre-
quency may be used only within a certain range of radials
from a designated reference location. The format for dis-
playing the sectorization is to show the frequency first, fol-
lowed by the identifier of the associated reference point,
followed next by the associated altitude restrictions. For
example, figure 3-139 shows that the Orlando approach
control frequency 121.10 MHz is used between the 311°
radial and the 60° radial from KMCO (Orlando
International airport) for altitudes at and below 5500 feet.
NOTE: When an altitude restriction is shown on the
Airport 4 page, the abbreviation BEL means at and below
the specified altitude. Likewise, the abbreviation ABV
means at and above the specified altitude. Thus, ABV
4000FT means at and above 4000 feet and BEL 3999ft
means at and below 3999 feet.
In a few cases, APR, DEP, CL B, CL C, TRSA, CTA, and
TMA frequencies are sectorized such that the restriction
cannot be displayed on a single page. When this occurs
the following message is displayed on the APT 4 page:
TEXT OF FREQUENCY USAGE NOT DISPLAYED
There are also some airports in the database for which no
communications information is available. The following
message is then displayed on the APT 4 page:
COMM FREQ DATA NOT AVAILABLE
|=KORL
|APR 121.10
| REF: KMCO
| 311^- 60^
| BEL 5500ft
|
APT[4
Figure 3-139