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00
19
20
80
29.92IN
WITHIN 2500 FT WITHIN 100 FT ALTITUDE REACHED
BAROMETRIC
MINIMUM BUG
BAROMETRIC
MINIMUM BOX
Figure 16-17. Barometric MDA Displays
BARO MIN 1200FT ON
Figure 16-18. Barometric MDA Altitude
Alert Setting
DRAFT
Horizontal Situation Indication
Heading
The compass card appears with the current
aircraft magnetic heading under the white
pointer at the top of the compass card (Figure
16-19). Letters (N–S–E–W) appear at the four
cardinal points and numbers indicate degrees
at 30° intervals. Major tick marks are at 10°
increments and minor tick marks at 5°.
A digital readout of the current magnetic heading
appears in a black box with large white digits
immediately above the compass card pointer
(lubber). For additional course awareness, a
crosstrack error (XTK) indication appears
near the bottom of the HSI whenever using
GPS as the primary navigation source and
course deviation indicator (CDI) exceeds maximum
deviation.
Turn Rate Indication
When the aircraft is yawing or turning, a magenta
arc extends from the center pointer, left
or right (depending on the direction of turn),
a few degrees around the outer edge of the
compass rose, to indicate the heading the aircraft
will reach in 6 seconds (up to 24°). Two
tick marks on either side of the center pointer,
above the compass rose, indicate turn rate. If
the magenta arc extends to the second tick
mark (at 18° from center), a standard-rate turn
(360° in 2 minutes) is indicated. The first mark
indicates a half-standard-rate turn.
At rates greater than 4°/second, an arrowhead
appears at the end of the magenta trend vector
and the prediction is no longer valid.
1
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
16 15 14
13
9
10
11
12
16
14
15
13
9
10
11
12
TURN RATE INDICATOR
TO/FROM INDICATOR
COURSE POINTER
HEADING BUG
FLIGHT PHASE
SELECTED COURSE
TURN RATE/HEADING
TREND VECTOR
CURRENT HEADING
LUBBER LINE
SELECTED HEADING
CURRENT TRACK BUG
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
　
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