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around the Flight Path Symbol, and the portion of the box that “touches” the
Pitch Scale.
Clipped Symbols
Symbols are also clipped when the aircraft attitude causes the HGS to
position certain symbols outside the display boundary. This occurs to the
HSI when either pitch or flight path angle causes the Zero-Degree Pitch
Line or the Flight Path Symbol to reach its display limit above the HSI
(Figure 4-57). As the pitch or flight path angle increases further, the HSI is
“pushed” down towards the bottom of the Combiner display.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 4-113
Figure 4-57:
Non-Conformal Symbols
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
4-114 November 2002 9701-1153 Rev A
Limited and Ghosted Symbols
The HGS “limits” some symbols to always remain inside the Combiner
display boundaries set by the HGS.
Depending on the symbol, it may be “ghosted” and may cause other
symbols to be “ghosted”. For example, if the aircraft attitude is such that the
Zero-Degree Pitch Line is no longer conformal to the real world, it is
“ghosted” (comprised of dashed lines). When the Zero-Degree Pitch Line is
“ghosted,” the Flight Path Symbol is also ghosted (Figure 4-58). The
limited symbol is displayed at the edge of the Combiner display to indicate
in which direction the left-side pilot needs to fly the aircraft to acquire the
conformal display. Once a symbol is ghosted, it will remain ghosted until
the display is conformal again.
Pitch Scale Compression
When the aircraft attitude is such that the Zero-Degree Pitch Line or the
Flight Path Symbol cannot be displayed conformally, the Pitch Scale is
compressed to allow these symbols to remain on the display (Figure 4-58).
The position of these symbols is maintained relative to one another, but the
display is no longer conformal with the real world. When the pitch attitude
is approximately -17° or 25°, the 5° pitch lines are removed.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 4-115
Figure 4-58:
Non-Conformal Symbols
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
4-116 November 2002 9701-1153 Rev A
HGS Modes/Symbology Matrix
Table 4-26 lists symbols associated with the categories defined above. The
table shows in which HGS modes a symbol can be displayed. Symbols are
described in the “Primary Mode Symbology” and “Approach Modes
Symbology” subsections in the order listed in this table.
Table 4-26: HGS Modes/Symbology Matrix (page 1 of 7)
PRI
Symbol
Ground
Flight
TO
AIII
AII
AI
RO
F/D
VMC
Attitude Symbology
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 Indicator ● ● ● ● ●
Angle-of-Attack Limit ● ● ● ● ● ●
Pitch Reference ● ●
Pitch Chevrons ● ● ● ● ● ●
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 4-117
Table 4 26. HGS Modes/Symbology Matrix (page 2 of 7)
Symbol
PRI
TO
AIII
AII
AI
RO
F/D
VMC
Airspeed Symbology
Computed Airspeed Scale and
Pointer
● ● ●
Computed Airspeed ● ● ● ● ● ●
Selected Airspeed/Mach ● ● ● ● ● ● ● ●
Mach Number ●
Wind Speed and Direction ● ● ● ● ● ● ●
Selected Airspeed Mark ● ● ●
Maximum Operating Speed Tape ●
Low-Speed Cue Tape ●
Takeoff Speed Marks ● ● ●
Reference Airspeed Table ● ●
Airspeed Trend Vector ● ● ●
Ground Speed ● ● ● ● ● ● ● ● ●
Altitude Symbology
Barometric Altitude Scale and Index ● ● ●
Barometric Altitude ● ● ● ● ●
Barometric Pressure Setting ● ● ●
Selected Altitude ● ● ●
Selected Altitude Mark ● ● ●
Metric Altitude Readout ● ● ●
Radio Altitude ● ● ● ● ● ● ●
Selected Decision Height ● ● ● ● ● ● ● ●
Decision Height Message ● ● ● ● ● ●
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
4-118 November 2002 9701-1153 Rev A
　
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