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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 AI can become the active mode, FCS captured modes must be LOC
and GS.
AI Mode Selection
Use this procedure to arm AI Mode:
NOTE: AI must be armed above 800 feet AGL.
1. Push the ACT pushbutton.
2. Push the STBY pushbutton until “AI?” shows.
3. Push the ENTER pushbutton.
The AI Mode is now armed. “AI” shows on the HCP STBY line. When the
FCS captures LOC and GS modes, “AI” flashes in the upper left corner of
the Combiner display, and the HGS changes to AI Mode.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-23
When AI is the active mode:
• “AI” 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 AI Mode symbology.
• PRI Mode is automatically set as the standby mode.
AI Mode Monitors
In AI Mode the HGS monitors these requirements:
• Sensors and input data
• HGS system integrity (BIT faults).
NOTE: The HGS does not monitor aircraft performance during AI
Mode approaches.
If the monitor finds a sensor or input data problem, or a BIT fault, AI
capability is lost. These changes occur if any condition causes a loss of AI
capability:
• “NO AI” flashes for 5 seconds and then is steady on the Combiner
display.
• “NO AI” shows on the HCP ACT line (Figure 3-15).
• “AI” shows in yellow on the PFDs.
• The Guidance Cue is removed from the Combiner display.
These “NO AI” displays stay until the AI conditions are met again or PRI
Mode is selected.
Use of autopilot: The HGS AI Mode can be used to monitor a coupled
autopilot approach.
Figure 3-15:
NO AI Display on HCP
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-24 November 2002 9701-1153 Rev A
F/D Approach Mode
F/D (Flight Director) Mode is available for manual or autopilot-coupled
FCS approaches. The F/D Mode approach symbology (Figure 3-16) has the
same format as the AIII Approach Mode symbology, but guidance is based
on commands from the FCS.
NOTE: In F/D Mode, the guidance cue is removed at 80 feet AGL.
F/D Mode Requirements and Conditions
Before F/D Mode can become the active mode, the FCS lateral armed or
captured mode must be LOC.
F/D Mode Selection
Use this procedure to select F/D Mode:
1. Push the ACT pushbutton.
2. Push the STBY pushbutton until “F/D?” shows.
3. Push the ENTER pushbutton.
The HCP STBY line shows “F/D”. When the FCS lateral armed or captured
mode is LOC, the HGS changes to F/D Mode.
When F/D is the active mode:
• “F/D” shows on the HCP ACT line and on the upper left part of the
Combiner display.
• The Combiner display shows F/D Mode symbology.
• PRI Mode is automatically set as the standby mode.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-25
Figure 3-16:
F/D Approach Mode Symbology (example)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-26 November 2002 9701-1153 Rev A
VMC Approach Mode
VMC Mode allows for visual approach operations. In VMC Mode the leftside
pilot establishes and maintains the aircraft on the proper glide path to
the runway without reference to a ground-based landing system (ILS,
VASI, etc.). VMC Mode approach symbology (Figure 3-17) is in the same
format as AIII, AII, AI, and F/D Modes with one exception: in VMC Mode
the HGS does not show a guidance cue. Instead, the left-side pilot uses the
Flight Path and Glideslope Reference Line to manually control the approach
using visual cues. This is particularly beneficial during approaches at night
or with poor visual cues.
VMC Mode Selection
Use this procedure to select VMC Mode:
1. Push the ACT pushbutton.
2. Push the STBY pushbutton until “VMC?” shows on the STBY line.
3. Push the ENTER pushbutton.
When VMC is the active mode:
• “VMC” shows on the HCP ACT line and on the upper left part of the
Combiner display.
• The Combiner display shows VMC mode symbology (Figure 3-17).
• PRI Mode is automatically set as the standby mode.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-27
Figure 3-17:
VMC Approach Mode Symbology (example)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
　
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