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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.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 4-39
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 4-18:
PRI Mode Flight Path Symbols
Flight Path Symbol “Ghosted” Flight Path Symbol
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
4-40 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 4-41
Figure 4-19:
PRI Mode Flight Path Symbols
Flight Path
Symbol
Flight Path
Acceleration
Speed
Error Tape
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
4-42 November 2002 9701-1153 Rev A
FCS-Derived Guidance Cue: The FCS-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.
During an EGPWS Windshear warning, the Guidance Cue becomes solid
and flashes for 10 seconds and then is steady.
Flight Path Slip/Skid Indicator: A Flight Path Slip/Skid Indicator is
displayed during a single engine approach or a single engine takeoff or goaround.
This Slip/Skid Indicator moves laterally underneath the Flight Path Symbol
to show lateral acceleration of the aircraft.
Flare Cue: A Flare Cue reminds the left-side pilot to visually flare the
aircraft. The Flare Cue is a pair of plus symbols (“+ +”): one shows on
each side and directly above the wings of the Flight Path symbol. The Flare
Cue flashes as the aircraft descends through 60 feet Radio Altitude, and
continues flashing until the aircraft descends through 30 feet.
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