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differences shown in Figure 5-18.
• The HGS active mode is AI
• Guidance Cue is removed at 80 feet AGL
• AI approach monitor does not include aircraft performance, and is only
active to 80 feet AGL
• Approach warnings are not given.
Figure 5-18:
AI Approach—300 Feet
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 5-25
Flight Director Approach (F/D)
The F/D mode allows the pilot to fly an FCS approach using the same
approach display format as the HGS AIII approach mode. In the F/D Mode,
the Guidance Cue is controlled by the FCS.
The F/D approach mode display is similar to an AIII approach with the
differences shown in Figure 5-19.
• The HGS active mode is F/D.
• The HGS derives the guidance cue from the FCS and removes it from
the display at 80 feet.
• The HGS displays FCS modes.
• The HGS shows the F/D Mode on the Combiner display and the PFDs.
• The HCP ACT line shows “F/D”.
• The HGS does not monitor the approach or give flare guidance.
However, the HGS shows flare cue (“+ +”) for the visual flare.
The left-side pilot can use the F/D Mode during a standard Flight Director
approach that is approved for the basic airplane or the operator’s Operations
Specification (e.g., a CAT I Flight Director approach).
Figure 5-19:
F/D Approach
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
5-26 November 2002 9701-1153 Rev A
Visual Approach
The HGS VMC mode makes situational awareness better during a visual
approach. This is particularly useful during visual approaches into airports
without visual approach aids like a VASI. For a visual approach, the HGS
allows the left-side pilot to accurately control the glidepath to the runway
without using ground-based guidance signals.
The Combiner displays shows the Glideslope Reference Line as it relates to
the real-world runway touchdown point. The left-side pilot uses Flight Path
on the touchdown point to fly the aircraft, which causes the aircraft to track
an inertial-based glideslope. The left-side pilot then has accurate descent
path data to prevent undershooting or overshooting the runway because of
poor visual cues or depth perception.
The subsections in the list that follows give data and instructions about how
to use the HGS VMC Mode:
• Establishing the Intercept Point
• Intercepting the Touchdown Zone
• Reaching Glidepath Position at 500 Feet
• Accomplishing Flare and Landing
• Basic Rollout
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 5-27
Establishing the Intercept Point
In Figure 5-20, the left-side pilot maneuvers the aircraft to establish the
intercept point. The aircraft is in a descending left turn to align itself
laterally with the runway.
Figure 5-20:
VMC Mode Approach—Lateral Alignment
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
5-28 November 2002 9701-1153 Rev A
Intercepting the Touchdown Zone
In Figure 5-21, the aircraft is now aligned laterally with the runway, and the
left-side pilot has leveled the aircraft to intercept the correct glideslope
angle.
If the Glideslope Reference Line is below the Touch Down Zone (TDZ), the
left-side pilot must fly a higher flight path angle until the line and the TDZ
intersect. If the Glideslope Reference Line is above the TDZ, the left-side
pilot must increase the descent, which occurs when the Flight Path symbol
is set below the TDZ until the Glideslope Reference Line and the TDZ are
aligned.
When the Glideslope Reference Line is on the TDZ, the left-side pilot
makes small corrections to keep the Flight Path on the TDZ and the
Glideslope Reference Line.
Figure 5-21:
VMC Approach—Intercepting the Touchdown Zone
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 5-29
Reaching Glidepath Position at 500 Feet
Figure 5-22 shows VMC symbology at 500 feet AGL. When the Glideslope
Reference Line overlays the TDZ, keep the Flight Path on the Glideslope
Reference Line to fly a 3° glidepath. The left-side pilot keeps airspeed
control the same as during other approach operations.
Figure 5-22:
VMC Approach—Glidepath Position at 500 Feet
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
5-30 November 2002 9701-1153 Rev A
Accomplishing Flare and Landing
The left-side pilot uses the usual visual cues and landing procedures to
accomplish flare and landing in the VMC mode (Figure 5-23). Between 60
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