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LATERAL DEVIATION SCALE
NAVIGATION SOURCE
AIRCRAFT SYMBOL
COURSE DEVIATION
INDICATOR
ROTATING COMPASS ROSE
HDG 013° CRS 013°
21
S
15
12
E
6
3
N
33
30
W
24
GPS TERM
287°
OBS
Figure 16-19. Horizontal Situation Indicator (HSI)
510OM-00 16-17
CITATION MUSTANG OPERATING MANUAL
Selected Heading Bug
A rotatable cyan heading bug appears on the
compass card at the selected heading, and the
heading is presented with cyan digits in the
black HDG box, immediately left of the magnetic
heading digital readout.
Radio Navigation
Selected Course, Course Pointer and
Course Deviation Indicator
The HSI can display three sources of navigation
NAV1, 2, or GPS. The CDI softkey cycles
through the navigation sources. The selected
course appears as a digital readout in the black
CRS box, immediately to the right of the magnetic
heading readout. The selected course
also appears as a long arrow across the face of
the compass card. This arrow is the course
pointer. The center section of the course pointer
is the CDI, which disappears when there is no
signal for navigation (Figure 16-20).
The color and depiction of the course indicator
(and digits in the CRS box) varies as selected
by the CDI softkey:
• NAV1—Green single arrow and green
selected course digits
• NAV2—Green double arrow and green
selected course digits
• GPS—Magenta single arrow and magenta
selected course digits
The course is selected by the CRS 1 (for pilot
PFD) or CRS 2 (for copilot PFD) knobs on the
AFCS controller. The navigation source for the
CDIs on the pilot and copilot PFDs can be synchronized
through the PFD setup window.
However, if the CDIs are not synchronized and
PFDs are set to the same VHF navigation
sources, the source reference (NAV or LOC) appears
in amber lettering. Refer to Table 16-3 for
information on flight phases and CDI scaling.
Bearing Pointers and Information
Windows
Two bearing pointers can be selected to appear
on the face of the compass card (press the PFD
softkey and select BRG1 and/or BRG2). The
BRG1 pointer is a single cyan line with an open
arrow pointer and the BRG2 pointer is a double
cyan line with an open arrow pointer. If a
bearing pointer is selected for display, a white
circle appears in the center of the compass card
to separate the bearing pointer(s) from the CDI.
Bearing pointers never override the CDI.
The BRG1 window is at the lower left corner
of the compass display and the BRG2 window
is at the lower right corner of the compass
display. Each window indicates:
• Distance to the station/waypoint
• Station/waypoint identifier (or frequency)
• Source for the bearing (NAV1, NAV2,
GPS, or automatic direction finder [ADF])
• Arrow icon matching the bearing pointer
OBS Mode
OBS mode is useful for holding and for intercepting
a course to a waypoint. Enabling
omni bearing selector (OBS) mode is useful
for holding and for intercepting a course to
a waypoint. OBS mode with the OBS softkey
suspends the automatic sequencing of
waypoints in a GPS flight plan, but retains
the active-to waypoint as the navigation reference
even after passing the waypoint. When
OBS is disabled by pressing the OBS softkey
again, the GPS returns to normal opera
t i o n , with automatic sequencing of
waypoints. OBS mode also allows a desired
course TO/FROM a waypoint to be set (with
a CRS knob); pressing the CRS knob recenters
the CDI and returns the course point TO
the waypount bearing.
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CITATION MUSTANG OPERATING MANUAL
S
15
12
N
33
0
VOR2
158°
21
S
15
3
N
33
GPS ENR
360°
LOI
12
E
30
W
GPS TERN
283°
SUSP
21
S
15
3
N
33
LOC1
180°
Figure 16-20. Navigation Sources
SUSPend Mode
SUSPend mode is automatically activated
when appropriate during approach operations.
As the aircraft crosses the missed approach
point (MAP), automatic approach waypoint sequencing
is suspended. SUSP appears on the
HSI (to the lower right of the aircraft symbol)
in place of OBS and the OBS softkey label
changes to SUSP. Also suspends when on vectors
to an approach or while in a hold.
Glide Slope
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