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extend from the corners on the unsafe side of the bracket. The position of
the bracket is determined by the vertical speed requirement output by TCAS
and represents the vertical flight path position that is safe. If a down
preventive bracket is displayed, then the Flight Path symbol should remain
below the bracket. An up preventive bracket requires that the Flight Path
symbol should remain above the bracket. Traffic avoidance is achieved by
keeping the Flight Path out of the unsafe zone. The HGS can have more
than one preventive advisory at a time.
Corrective Advisory: Corrective advisories require an immediate vertical
evasive maneuver by the crew and are accompanied by a “fly-to” region for
Flight Path. This advisory shows a double-lined box. Like the preventive
bracket, angled lines extend from the corners on the unsafe side, but in this
case the top, bottom, or both can be considered unsafe as indicated by the
double lines. The position of the box is determined by the vertical speed
requirements output by TCAS corresponding to the green band on the
PFD’s Vertical Speed Indicator (VSI) and represents the vertical flight path
position that is safe. The height of the box represents the 500-fpm fly-to
zone indicated by TCAS corresponding to the PFD VSI green band. It is
also acceptable to fly outside the box on the safe side.
At times, traffic is both above and below the aircraft. In these cases, the
indication can be both corrective and/or preventive advisories with unsafe
zones on opposite sides. Although it is not possible to have more than one
corrective advisory (separate boxes), if a preventive symbol overlaps a
corrective symbol, or two preventive symbols overlap, the two symbols will
merge into a combined corrective advisory. In this case, both the top and
bottom are considered unsafe, and the advisory command is to maneuver to
position the Flight Path Symbol within the box.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 4-95
Figure 4-47:
Non-Normal Symbols
Down Preventive Descend Corrective
Up Preventive
Up and Down Preventive Combined Corrective
Climb Corrective
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
4-96 November 2002 9701-1153 Rev A
Windshear Alert: A Windshear Caution or Windshear Warning message
will be displayed above the Aircraft Reference Symbol during windshear
conditions, as directed by the aircraft’s Enhanced Ground Proximity
Warning System (EGPWS). The Windshear Caution is displayed on two
lines. Both the Windshear Warning and Windshear Caution flash for 10
seconds when first displayed.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 4-97
Figure 4-48:
Non-Normal Symbols
Windshear
Alert
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
4-98 November 2002 9701-1153 Rev A
Source Messages
These symbols show on the Combiner display only if a non-normal source
selection occurs.
See Figure 4-49. Table 4-22 gives the symbology for the Source Messages
Symbology Group.
Table 4-22: Source Messages Symbology Group
PRI
Symbol
Ground
Flight
TO
AIII
AII
AI
RO
F/D
VMC
Attitude Source ● ● ● ● ● ● ●
Air Data Source ● ● ● ● ● ● ●
Display Control Panel
Source
● ● ● ● ● ● ●
Autopilot Operational
Status
● ● ● ● ● ● ●
Attitude Source: The Attitude Source is shown on the left upper part of the
Combiner display. When the Reversionary Switching Panel (RSP) ATTD
HDG switch is set to 1, “ATT1” is displayed; when the ATTD HDG switch
is set to 2, “ATT2” is displayed.
Air Data Source: The Air Data Source is shown on the left upper part of
the Combiner display. When the RSP AIR DATA switch is set to 1,
“ADC1” is displayed; when the AIR DATA switch is set to 2, “ADC2” is
displayed.
Display Control Panel Source: The Display Control Panel Source is
shown on the left upper part of the Combiner display. When the RSP DISP
CONT switch is set to 1, “DCP1” is displayed; when the DISP CONT
switch is set to 2, “DCP2” is displayed.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 4-99
Autopilot Operational Status: The Autopilot Operational Status is
displayed in the upper left part of the display. One of four messages show
when necessary:
Symbol Flight Control System Status
“1 / 2BNK” Half Bank
“SYNC” FD Synchronize
　
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