BARO/RAD Toggles the Barometric Altitude Minimums Display between dashes (---) at
power-up, baro min display, rad min display and off (blank).
PREVIEW When FMS is the displayed navigation source on the PFD, VOR/ILS course
deviation and vertical deviation may be previewed on the compass card
formats.
NAV Button Pressing the NAV button selects the VOR for display on the HSI course
deviation indicator (CDI). Pressing the button alternately selects NAV 1 and
NAV 2 (annunciated VOR 1 and VOR 2 on the center right side of the HSI;
ILS 1 and ILS 2, if ILS frequency is tuned in NAV). The flight director
interfaces with the NAV that is selected and displayed on the HSI.
FMS Button Selects flight management system (FMS) for display on the HSI; the flight
director will interface with the FMS. The HSI course needle represents FMS
course information on the bearing pointer. If two FMS's are installed, the
switch will toggle between the two.
Bearing " O " This knob has four positions. The OFF position removes the bearing pointer
from the display. In NAV 1 position, VOR 1 bearing information is displayed.
In ADF 1 position, ADF 1 bearing is displayed. Selecting FMS displays FMS
information. If two FMSs installed, selects FMS 1.
PFD DIM (Outer
Concentric)
The DIM knob sets the overall brightness of the PFD. When a reference level
is set, photoelectric sensors will maintain the relative brightness level in
various lighting conditions. Full counterclockwise OFF position blanks the
PFD and the PFD information is displayed on the MFD.
Radio Altitude Rotation of the DH inner concentric knob adjusts the radio altitude decision
height display on the ADI. Rotating the inner knob fully counterclockwise
removes decision height information from the display.
Test Function
(TEST)
Pressing and holding the TEST button causes the displays to enter the test
mode. Flags, cautions, and all flight director and mode annunciations are
tested and presented on the display. As the test button is held down an
autopilot (left display only) and flight director system checks will be
accomplished. Satisfactory or unsatisfactory test results will be annunciated
on the display. The test will also result in a self-test of the radio altimeter
system; 50 feet will be indicated in green at the bottom of the ADI display.
The TEST button is wired through a squat switch and is completely active
only when the airplane is on the ground. The Primus 1000 test is not active in
flight, but a self-test of the radio altimeter system may be made in flight if the
APR mode is not selected. The EFIS system will also automatically self-test
when it is powered up. If the test is not satisfactory it will be so annunciated.
Bearing “ ”
This knob has four positions. The OFF position removes the bearing pointer
from the display. In NAV 2, NAV 2 bearing is displayed. In ADF 2 position (if
installed), ADF 2 bearing is displayed. In FMS position, FMS is displayed.
Decal will be OFF/NAV/ADF/FMS, if FMS 2 is installed.
Cessna Citation XLS - Instrumentation & Avionics
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