t. Communication Radio Control.
(1) Communication Radio Control Overview.
The FMS-800 provides control of the following
functions from the CDU for the ARC-210 V/UHF radio.
1. V/UHF radio mode selection.
tone, and modulation control.
3. V/UHF radio scanning operation.
4. HAVE QUICK I/II function control,
selection, time synchronization, date
SINCGARS control functions.
In addition, the flight displays provide heads up
control and display of the communication radios.
Communication radio frequency selection is
available via the communication page by selecting the
COM function key of the CDU. The V/UHF control
pages provide the basic radio control features.
Specialized pages, such as the V/UHF HAVE QUICK
II setup pages and SINCGARS control pages, are also
If the FMS-800 cannot interface with a radio for
any reason (i.e., LRU failure, data bus failure, etc.), a
check mark () will be displayed to the left of the title
line of all pages corresponding to that radio. A will
also be displayed on the communication pages
adjacent to the preset number of the LRU.
Power to the communication radio is controlled
via the power pages.
The FMS-800 also has provisions for an
external, crew-activated emergency mode switch for
setting all communication radios to emergency
frequencies, if installed on the aircraft.
(2) V/UHF Radio Control.
(a) V/UHF Frequency Selection. The
crew may tune the V/UHF radios by frequency,
Frequency tuning is performed directly on the
frequency in the scratchpad and pressing the channel
selection line select key. Refer to Figure 3C-124 and
Table 3C-86. A valid frequency is entered as two to
three digits followed by up to four decimals, followed
by A, AM, F, or FM to define the modulation type. An
M is displayed as the preset number to indicate the
frequency was entered manually. Possible ways of
tuning the communication radio are with manual
identifiers, or maritime channel entries), preset callsign
entry, preset number selection, or airport frequency
Figure 3C-124. Frequency Control
Table 3C-86. Frequency Control
Communication Page Procedure
Pressing the function key COM will
access the communication page.
Enter airport identifier and access the
V/UHF airport frequency page.
Enter preset callsign or display airport
Enter frequency or channel.
To access preset list.
Indicates preset number.
To access the V/UHF control page.
Recall frequency to last tuned.
The crew may also tune a V/UHF frequency
using the scratchpad of any CDU page and the QUICK
TUNE push button, located on the pilot's and copilot's
control yoke. Enter any of the following into the CDU
scratchpad and press the QUICK TUNE push button
to tune the radio.
1. A valid V/UHF frequency, channel, or net
2. A valid callsign for a V/UHF frequency
located in the preset list. This does NOT
include airport frequency callsigns.