The NAV 1 and NAV 2 antennas are located
on either side of the vertical stabilizer.
The CDU has the capability of automatically
tuning the VHF NAV receivers in order to im-
prove the calculation of airplane position by
the FMS. This feature has no effect on current
procedural navigation aids and will choose
only those VORs or ILSs that provide the best
signal reception and position information. This
auto tune function is selected from the navi-
gation portion of the CDU TUNE page. The
auto tune function is automatically cancelled if
any of the following occur.
•
DME HOLD is selected
•
A NAV receiver is manually tuned using
either the RTU or the CDU
•
The FMS is deselected as a NAV source
•
A NAV receiver fails
If a malfunction occurs when the auto tune
function is active, it may be manually disabled
using the RMT TUNE switch located on the
reversionary panel (Figure 16-124). Moving
this switch from the NORMAL position to the
DISABLE position will disable the auto tun-
ing function of the CDU. This includes the
auto tune feature discussed here and localizer
auto tuning after loading an approach. In
other words, having the RMT TUNE switch
selected to DISABLE requires the pilot to
tune the NAV radios manually for all subse-
quent operations.
Figure 16-124. RMT Tune Switch
Automatic Direction Finder (ADF)
The automatic direction finder (ADF) allows
navigation using non-directional beacons
(NDBs). As mentioned in the VHF Navigation
section, the ADF is part of the NAV-4000 unit
and does not have a separate line replaceable
unit (LRU). Magnetic bearing to NDB sta-
tions is displayed on the PFD and MFD with
selectable bearing pointers. ADF receivers are
tuned using the CDU tune page or the RTU.
The ADF antenna is mounted on the lower
fuselage. A second ADF receiver is optional.
Distance Measuring Equipment
(DME)
The DME-4000 receiver determines slant-
range distance, groundspeed, and time-to-sta-
tion for the navaid tuned on the respective
Nav receiver. A single DME-4000 is standard
but it contains three channels. Channel 1 is the
DME for NAV 1, Channel 2 is the DME for
NAV 2 and Channel 3 is a “blind” channel that
the FMS can use to tune any frequency it
chooses. Should the optional second DME-
4000 be installed, Channel 1 for each unit will
be the DME for NAV 1 and NAV 2. Channels
2 and 3 for each DME-4000 will be “blind”
channels that the FMS can use to tune any fre-
quency it selects.
DME information is shown on the PFD (Fig-
ure 16-125) when the ground-based navigation
source is selected for display. If only FMS is se-
lected, then DME will not be displayed in the
active NAV location. In that case, a bearing
pointer will have to be displayed to get
ground-based DME. The DME receivers are
tuned using the CDU tune page or RTU. Each
DME receiver can also be automatically tuned
by the FMS as described in the VHF Naviga-
tion section. The DME antenna is mounted on
the lower fuselage.
FOR TRAINING PURPOSES ONLY
16-68
KING AIR C90GTi/C90GTx
PILOT TRAINING MANUAL
16
A
VIONICS
Summary of Contents for C90GTi
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