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(Figure 3-5).
• Push the ENTER pushbutton to arm TO Mode.
NOTE: TO Mode can be armed at the gate if the necessary conditions
are met.
• Align aircraft with the runway.
• Push the TO/GA pushbutton.
• PRI Mode is automatically set as the standby mode.
TO Mode is active until the aircraft ascends through 50 feet AGL. The HGS
then changes to PRI Mode. In a rejected takeoff, the HGS changes to PRI
Mode when the ground speed is less than 20 knots.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-9
Figure 3-5:
TO Mode Selection (example)
Figure 3-6:
TO Mode Symbology (example)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-10 November 2002 9701-1153 Rev A
TO Mode Monitor
In TO Mode the HGS monitors these requirements:
• Sensors and input data
• HGS system integrity (BIT faults).
If the monitor finds a sensor or input data problem, or a BIT fault, TO
capability is lost. These changes occur if any condition causes a loss of TO
capability:
• “NO TO” shows on the HCP ACT line.
• “NO TO” flashes for 5 seconds and then is steady on the Combiner
display.
• “TO” shows in yellow on the PFDs.
• The Guidance Cue is removed from the Combiner display.
If the ground speed is between 20 and 80 knots, a takeoff warning occurs:
“TO WARN” shows on Combiner display and in red on the PFDs.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-11
AIII Approach Mode
NOTE: Obtain operational approval from the appropriate regulatory
authority before conducting HGS low-visibility operations.
The HGS AIII Mode is specifically designed for manual ILS approach and
landing operations to CAT III minimums. In AIII Mode, the HGS removes
the altitude and airspeed tape displays and replaces them with numeric
representations (Figure 3-7). The HGS also replaces the HSI with ILS raw
data in proximity to the flight path group near the center of the display. In
the AIII mode, the guidance cue gives flight path guidance derived from HC
internal approach and landing guidance algorithms.
Figure 3-7:
AIII Approach Mode Symbology (example)
AIII conditions and more instructions can be found in “AIII Mode
Requirements and Conditions,” “AIII Mode Selection,” and “AIII Mode
Approach Monitors” in this subsection.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-12 November 2002 9701-1153 Rev A
AIII Mode Requirements and Conditions
These AIII conditions are necessary to arm AIII Mode:
• The runway elevation is set.
• The G/S angle is set.
• IRS #1 and IRS #2 are in NAV mode.
• All reversion selections (ATTD HDG, AIR DATA, EICAS, DISP
CONT, MFD reversion) are in NORM position.
• Basic attitude (pitch, roll, heading) data are within limits.
• All sensors/input data are valid.
• There are no HGS BIT faults.
• #1 and #2 VHF Navigation Receivers are tuned to the same localizer
frequency.
• FCS armed lateral and vertical modes are LOC and GS.
• The aircraft is above 800 feet AGL.
NOTE: AIII Mode can be selected on the STBY line before some of the
conditions necessary to arm the mode are met. “AIII” (with no
question mark) shows on the HCP STBY line, but does not
show as an armed mode on the Combiner display until all of
the conditions necessary to arm the mode are met.
Before AIII can become the active mode, FCS captured modes must be
LOC and GS.
AIII Mode Selection
Use this procedure to arm AIII Mode:
NOTE: AIII must be armed above 800 feet AGL.
1. Push the ACT pushbutton.
2. Push the STBY pushbutton until “AIII?” shows.
3. Push the ENTER pushbutton.
The AIII Mode is now armed. “AIII” shows on the HCP STBY line. When
the FCS captures LOC and GS modes, “AIII” flashes in the upper left
corner of the Combiner display, and the HGS changes to AIII Mode.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-13
When AIII is the active mode:
• “AIII” shows on the HCP ACT line, on the upper left part of the
Combiner display, and in green on the PFDs.
• The Combiner display shows AIII Mode symbology.
• PRI Mode is automatically set as the standby mode.
AIII Mode Approach Monitors
In AIII Mode the HGS monitors these requirements:
• Sensors and input data
• HGS system integrity (BIT faults)
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