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3-28 November 2002 9701-1153 Rev A
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HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 4-1
Section 4:
HGS Symbology
HGS symbology descriptions and illustrations are presented in five
subsections in the order listed:
• Primary Mode Symbology: Describes symbols used by Primary Mode
and during takeoff.
• Approach Modes Symbology: Describes symbols used in AIII, RO,
AII, AI, F/D and VMC Approach Modes.
• Non-Normal Conditions Symbology: Describes non-normal
symbology, source messages, warning messages, failure flags, and
miscompare flags.
• Non-Conformal Displays: Describes how the HGS displays certain
symbols in a non-conformal manner depending on mode of operation
and aircraft attitude.
• HGS Modes/Symbology Matrix: Lists all symbols and the HGS
modes in which they can be displayed.
How to Use the Symbology Section
Many symbols are the same in Primary and the Approach modes. Common
symbols are repeated in the “Primary Mode Symbology” and “Approach
Modes Symbology” subsections. Symbols are grouped under each
subsection according to attitude, airspeed, altitude, navigation, flight path,
takeoff and rollout. This method helps locate desired symbol descriptions
and illustrations.
Use the “HGS Modes/Symbology Matrix” at the end of this section as an
overview of symbology and relevant HGS modes in which each symbol can
be displayed.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
4-2 November 2002 9701-1153 Rev A
Primary Mode Symbology
The Primary Mode symbology sets are similar to the EFIS Primary Flight
Display. Symbol descriptions and illustrations are grouped in the following
order:
• Attitude
• Airspeed
• Altitude
• Navigation
• Flight Path
• Takeoff
NOTE: Symbology illustrations used in this section show appearance,
location, and relationship with associated symbology. Other
symbols have been removed to aid quick identification and
location on the HGS display of the referenced symbol.
Primary Mode Attitude Symbol Group
See Figure 4-1, Figure 4-2, and Figure 4-3. The Primary Mode Attitude
Symbol Group has the symbols listed in Table 4-1.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 4-3
Table 4-1: Primary Mode Attitude Symbol Group
PRI
Symbol
Ground
Flight
TO
Aircraft Reference ● ● ●
Roll Scale and Pointer ● ● ●
Zero-Degree Pitch Line ● ● ●
Pitch Scale ● ● ●
Conformal Magnetic Heading Scale (tic marks) ● ● ●
Conformal Magnetic Heading Index ● ● ●
HSI Heading Scale ●
Roll Scale Slip/Skid Indicator ● ● ●
Aircraft Reference Slip/Skid Indicator ●
Angle of Attack Limit ●
Pitch Reference ● ●
Pitch Chevrons ●
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
4-4 November 2002 9701-1153 Rev A
Aircraft Reference: The Aircraft Reference Symbol (Boresight symbol),
represents the projected centerline of the aircraft (boresight). The vertex of
the symbol is the actual boresight point.
The Aircraft Reference symbol is positioned at a fixed location on the
display and, unlike other displayed symbols, it is not dependent on any
sensor or equipment inputs. Its function is similar to the aircraft symbol on
conventional attitude instruments and is always present when the HGS is
powered and in normal operation.
Roll Scale and Pointer: The Roll Scale and Pointer are above the Aircraft
Reference Symbol. The scale has tic marks at 10° increments between 0°
and ±30°. Tic marks at 45° and 60° are also added to the roll scale when the
aircraft exceeds ±40° and ±55°, respectively. The Roll Scale is similar to
the “Sky Pointer” on a conventional ADI. The pointer points to the
corresponding roll attitude on the scale.
Zero-Degree Pitch Line: The Zero-Degree Pitch Line is used with the
Aircraft Reference symbol to represent the pitch attitude of the aircraft.
When the Flight Path Symbol overlays the Zero-Degree Pitch Line, the
aircraft is in level flight.
NOTE: Because of the earth's curvature, the Zero-Degree Pitch Line is
only aligned with the physical horizon at 0 ft AGL. As the
altitude of the aircraft increases, a separation between the
horizon and the Zero-Degree Pitch Line is visible (most
noticeable above 2500 ft AGL). At cruising altitudes, there can
be a significant separation between the Zero Degree Pitch Line
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