RADIO TUNING UNIT (RTU)
As with the CDU, the radio tuning unit (RTU)
can be used for all radio tuning. Also similar
to the CDU is that all green frequencies are
the active frequencies and all white frequen-
cies are the standby or unused frequencies
(Figure 16-132).
RTU Tuning
There are three methods of RTU radio tuning:
direct tuning, recall tuning, and tuning from
the preset pages.
Direct Tuning
The radios are directly tuned by changing the
active frequency. This is accomplished when
the white cursor (hollow white box) is over the
green active frequency.
Recall Tuning
Recall tuning is accomplished by tuning a fre-
quency in the recall position (white color fre-
quencies) and then swapping the active and
recall frequencies by pressing the recall line se-
lect key.
Preset Tuning
Preset tuning (i.e., stored frequencies) is en-
abled when the TUNE MODE on the COM
PRESET PAGE is set to PRESET. The tuning
knobs are then used to select the desired pre-
set memory number instead of tuning a fre-
quency (Figure 16-133).
Line Select Keys
The line select keys (LSK) are used to place
the cursor, navigate to a subpage, and make se-
lections. Pressing the line select keys once
places the cursor (a hollow white box) around
the frequency at that location. Pressing the
LSK next to active frequencies twice navigates
16-73
FOR TRAINING PURPOSES ONLY
KING AIR C90GTi/C90GTx
PILOT TRAINING MANUAL
16
A
VIONICS
Figure 16-131. Control Wheel (PTT) Switches
Summary of Contents for C90GTi
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