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not normally available on conventional head-down displays. The FPS
shows the actual flight path vector of the aircraft. The gull wings of the FPS
are angled downward at 30° to the horizon so that in a 30° level turn, the
30° angle overlays the Zero-Degree Pitch Line.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 4-79
The FPS is inertially-derived and gives an immediate indication of where
the aircraft is going. The left-side pilot can maneuver the aircraft and “fly”
the FPS to the desired point. For example, if the FPS is above the Zero-
Degree Pitch Line, the aircraft is climbing. If it is below the Zero-Degree
Pitch Line, the aircraft is descending. The Flight Path angle is indicated by
the position of the center of the Flight Path circle relative to the pitch scale.
If the FPS overlays the runway touchdown point and the Flight Path angle is
-3°, then the aircraft is tracking a -3° approach angle to the runway
touchdown point.
The Flight Path symbol is only displayed in flight and has priority over all
other symbols except the Guidance Cue and Flare Command symbology.
Any part of any other symbol that is within the circular portion of the FPS is
not displayed.
The Flight Path symbol position can be limited laterally or vertically. When
this occurs the FPS is “ghosted”, meaning it is displayed as dashed lines
rather than solid lines. This indicates that the FPS is no longer conformal
with the real world scene. See “Non-Conformal Displays” later in this
section for additional information.
Figure 4-38:
Approach Modes Flight Path Symbols
Flight Path Symbol “Ghosted” Flight Path Symbol
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
4-80 November 2002 9701-1153 Rev A
Flight Path Acceleration: The inertial acceleration (or deceleration) of the
aircraft along the flight path is indicated by the Flight Path Acceleration
symbol. It is an indication of the total sum of all forces affecting the aircraft
including thrust, drag, and the air mass through which the aircraft is
moving. It represents the current energy state of the airplane. Therefore, it
should not be thought of as a throttle indicator or command, however it can
be used very effectively to control speed or flight path angle.
In flight, the Flight Path Acceleration symbol is positioned to the left of the
Flight Path Symbol. When the symbol is above the “wing” of the Flight
Path symbol, the aircraft is accelerating. When it is below the Flight Path
symbol wing, the aircraft is decelerating. When the symbol points directly
at the left wing of the Flight Path symbol, it shows that the aircraft is in a
steady state (neither accelerating nor decelerating).
If the Flight Path symbol is removed, the Flight Path Acceleration symbol is
referenced to the Aircraft Reference Symbol.
On the ground, the Flight Path Acceleration symbol uses the Aircraft
Reference or the Ground Roll Reference symbol as its reference.
Speed Error Tape: The Speed Error Tape displays the difference between
the indicated airspeed and the selected airspeed. It is positioned on the left
wing of the Flight Path symbol and rises above the wing when the airspeed
is higher than selected, or falls below the wing when it is slower. Each one
degree on the Speed Error Tape (about the diameter of the Flight Path
circle) represents approximately five knots of airspeed error. The tape
length is limited to 15 knots of error.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 4-81
Figure 4-39:
Approach Modes Flight Path Symbols
Flight Path
Symbol
Speed
Error Tape
Flight Path
Acceleration
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
4-82 November 2002 9701-1153 Rev A
HGS-Derived Guidance Cue: during AIII, AII, and AI Modes, the
HGS-Derived Guidance Cue can be thought of as a “Flight Path Director”.
It functions in the same way as a conventional single cue flight director.
The object is to center the Guidance Cue inside the Flight Path circle using
pitch and roll inputs. The lines on the Guidance Cue indicate roll
commands.
NOTE: When the HGS modes change from Primary to AIII, AII, or
AI, the Guidance Cue can make a small change in its position.
This change is caused when the source for the Guidance Cue
changes from FCS to HGS.
In AII and AI Modes, the HGS-Derived Guidance Cue shows on the
Combiner display when the RA is greater than 80 feet.
FCS-Derived Guidance Cue: The FCS-Derived Guidance Cue can be
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