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The Model 4200 HGS mode selection sequence requires that TO, AIII, AII,
AI, F/D, and VMC modes are only available while PRI is the active mode.
For more data about the symbology that is specific to each mode, refer to
Sections 4 (“HGS Symbology”) and 5 (“Typical Flight Profile”) of the Pilot
Guide.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-3
PRI Mode
To select PRI Mode at any time, push the ACT pushbutton.
When PRI Mode is the active mode:
• “PRI” shows on the HCP ACT line and on the upper left part of the
Combiner display.
• The Combiner display shows Primary mode symbology.
In PRI Mode, the Combiner shows airspeed and altitude tapes on the left
and right sides of the display and a sectored HSI in the lower center of the
display (Figure 3-2). This display format is modeled after the EFIS Primary
Flight Display (PFD), which combines ADI, HSI, Airspeed, and Altimeter
data in one display.
Figure 3-2:
Primary Mode Symbology (example)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-4 November 2002 9701-1153 Rev A
The Combiner shows this data in PRI Mode:
• Aircraft Reference (Boresight) symbol
• Pitch attitude: scale and Zero-Degree Pitch Line
• Roll attitude: scale
• Heading: Zero-Degree Pitch Line, HSI
• Airspeeds: CAS (tape), VS, Ground Speed, Speed Error Tape
• Altitudes: Barometric Altitude (tape), Radio Altitude
• Flight Path
• Flight Path Acceleration
• Roll Scale Slip/Skid Indicator
• FCS Guidance Cue and modes
• Navigation data: ILS, VOR, DME, ADF, FMS, Marker Beacons
• Wind Speed and Direction
• Selected parameters: Course, Heading, Airspeed, and Altitude
• Flags
Typical Applications in PRI Mode
PRI Mode is available for all phases of flight and ground operations
including:
• Takeoff
• Climb
• Enroute
• Descent
• Approach (includes non-precision and precision approaches that use
FCS guidance)
• Landing
PRI Mode is available while the aircraft is on the ground. The HSI, Flight
Path, Flight Path-related symbols, and FCS-Derived Guidance Cue do not
show on this Combiner display (Figure 3-3).
Takeoff data and guidance are available only in the TO Mode. For more
instructions about TO Mode, refer to the subsection “TO Mode” that
follows this subsection on Primary Mode.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-5
Figure 3-3:
Primary Mode Symbology on Ground (example)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-6 November 2002 9701-1153 Rev A
Enroute Display in PRI Mode
Figure 3-4 shows a possible Combiner display while the aircraft is in flight.
Note that the Flight Path symbol is non-conformal and thus is drawn with
dashed lines (ghosted). The high wind speed and angle (directly from the
left) cause the aircraft to crab into the wind to stay on the selected ground
track. If the wind speed decreases or the wind direction angle decreases
(relative to the aircraft centerline) the Flight Path symbol will become
conformal and be drawn as a normal, non-ghosted, symbol.
The non-conformal display of the Flight Path symbol is also possible in
other HGS modes. Refer to Section 4, “HGS Symbology” for more
information.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-7
Figure 3-4:
Enroute Display in PRI Mode (example)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-8 November 2002 9701-1153 Rev A
TO Mode
NOTE: Obtain operational approval from the appropriate regulatory
authority before conducting HGS low-visibility operations.
TO Mode gives HGS computed guidance to track the runway centerline
(Figure 3-6).
TO Mode Requirements and Conditions
The conditions necessary to arm TO Mode are:
• The aircraft is on ground.
• All reversion selections (ATTD HDG, AIR DATA, EICAS, DISP
CONT, MFD reversion) are in NORM position.
• All sensors/input data are valid.
• There are no HGS BIT faults.
• #1 and #2 VHF NAV receivers are set to the localizer frequency.
• Runway length is set.
• DH is set to 100 feet or less.
Before TO can become the active mode, the aircraft must be aligned with
the runway.
TO Mode Selection
To select TO Mode:
• Push the ACT pushbutton.
• Push the STBY pushbutton until “TO?” shows on the STBY line
　
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