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positions to help minimize deviations and anticipate corrections.
• Controls airspeed by maintaining the Flight Path Acceleration symbol
aligned off the Flight Path wing.
These relationships allow the pilot to easily identify any deviations in the
ILS tracking or any airspeed error.
The “AIII” in the Combiner’s upper-left corner shows the selected mode
and approach status. This AIII status message remains as long as all
required parameters and conditions are valid for a CAT III approach. If a
condition develops that invalidates a required parameter, the HGS replaces
the “AIII” message with “NO AIII”. Below 500 feet, the HGS also displays
an “APCH WARN” message. If an approach warning occurs, the left-side
pilot should do a go-around, unless adequate visual cues are available.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 5-19
AIII Approach—50 Feet
Figure 5-13 shows:
• Aircraft descends through 50 feet Radio Altitude.
• Decision Height annunciation shows beside the Radio Altitude.
• When Flare Command (“+”) moves into center of Guidance Cue, flare
maneuver should start. “FLARE” shows in green on PFDs.
• Airspeed is 129 knots and the selected airspeed is 130 knots.
• The Runway Edge Lines do not show below 60 feet. This allows the
pilot to make the decision to land on visual cues only at DH with no
influence from synthetic inputs.
• Glideslope deviation raw data does not show below 70 feet AGL
because the glideslope is unreliable at this point and the HGS no longer
uses it for guidance computations. The HGS is in Glideslope extension
to accurately give touchdown guidance.
• From decision height to touchdown, the left-side pilot should track the
HGS Guidance Cue while using real world visual cues to assist in
assessing approach performance.
• First officer continues to monitor approach, head-down, through
touchdown.
Figure 5-13:
AIII Approach—50 Feet
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
5-20 November 2002 9701-1153 Rev A
AIII Approach—Flare/Touchdown
A flare maneuver transitions the aircraft from the approach attitude to the
touchdown attitude.
The computed touchdown is designed to firmly establish the aircraft on the
ground within the acceptable touchdown footprint, while tracking the
runway centerline.
Figure 5-14 shows:
• Aircraft is flared into landing attitude
• Aircraft descends through 15 feet AGL
• “IDLE” shows on Combiner display to remind left-side pilot to idle
power
• Aircraft slows through 128 knots
• Aircraft is in position over centerline of runway
Figure 5-14:
AIII Approach—Flare/Touchdown
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 5-21
AIII Rollout (if enabled)
Figure 5-15 shows:
• At touchdown in AIII Mode, HGS automatically changes to RO Mode
(if enabled)
• “RWY” gives remaining runway of 3,500 meters (if enabled)
• Ground Guidance Cue and Ground Localizer Deviation Scale and
Pointer give a precise indication of aircraft’s lateral deviation from
runway center line
• Ground speed is 80 knots.
When the aircraft starts to decelerate, the Deceleration Scale shows on
rollout. The Deceleration Pointer (“>”) shows the deceleration rate (in
“Gs”) caused by braking. When the ground speed is less than 20 knots, the
HGS changes automatically to PRI Mode.
Figure 5-15:
AIII Rollout (if enabled)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
5-22 November 2002 9701-1153 Rev A
Rollout with Localizer Line (if RO Mode not enabled)
Figure 5-16 shows rollout with localizer line symbology. This display
shows after touchdown following an approach in PRI, AIII, AII, AI, or F/D
if RO Mode is not enabled.
Figure 5-16:
Rollout with Localizer Line
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 5-23
AII Approach
The AII approach mode display is similar to an AIII approach with the
differences shown in Figure 5-17.
• The HGS active mode is AII
• Guidance Cue is removed at 80 feet AGL
• AII approach monitor is active only to 80 feet AGL.
Figure 5-17:
AII Approach—300 Feet
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
5-24 November 2002 9701-1153 Rev A
AI Approach
The AI approach mode display is similar to an AIII approach with the
　
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