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9
TAKEOFF TOUR
190-00356-00 Rev E
Selecting COM and VLOC Frequencies
While the 400W-series unit is acquiring a position,
let’s take a minute to dial in the active and standby
frequencies you’ll be using for the first phase of your
flight. The
400W-series
display is divided into separate
“windows” (or screen areas), including a COM window,
VLOCwindow,andtheGPSwindow.
COM Window:
Active Frequency
COM Window:
Standby Frequency
with tuning cursor
VLOC Window:
Active Frequency
Pushing the small left knob activates the tuning
cursor in the desired frequency window. To select the
active frequency, you must first enter the frequency
in the standby field, and use the COM flip-flop (or
VLOC flip-flop) key to move it to the active field.
To change the standby communication (COM) or
VLOC frequency:
1. If the tuning cursor is not currently in the
desired window (COM or VLOC), press the
small left knob momentarily to switch the
highlight between the COM and VLOC win-
dows. Adjusting the frequencies with the large
and small left knobs will affect the standby
frequency.
2. Turn the large left knob to select the desired
megahertz (MHz) value. For example, the
“135” portion of the frequency “135.325”.
3. Turn the small left knob to select the desired
kilohertz (kHz) value. For example, the “.325”
portion of the frequency “135.325”.
4. To activate the selected frequency, press the
appropriate flip-flop key—COM for commu-
nication frequencies or VLOC for VOR/Localizer
frequencies.
Once you’ve entered the active frequency, simply
repeat steps 1 through 3, above, to enter the standby
frequency. After both communication frequencies have
been entered, you may elect to keep the COM window
‘hot’ by leaving the cursor on the standby frequency, or
movethecursortotheVLOCwindowbypressingthe
small left knob.
Once you’ve entered the active frequency, simply
repeat steps 1 to 3, above, to enter the standby fre-
quency. After both communication frequencies have
been entered, you may elect to keep the COM window
“hot” by leaving the cursor on the standby frequency,
ormovethecursortotheVLOCwindowbypressing
the small left knob.
NOTE: When selecting VLOC frequencies, the
tuning cursor automatically returns to the COM
window after 30 seconds of inactivity.
NOTE: GPS level of service annunciations (LPV,
ENR, etc.) are not applicable to the external CDI
(or HSI) when VLOC is active.
These features are only available in the 420W/430W
units.
Selecting COM and VLOC Frequencies
420W / 430W Only