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turn
• Aircraft descends through 6,000 feet toward the Selected Altitude of
5,000 feet at 2100 FPM
• Airspeed is at 230 knots
• Because of the descent angle, the aircraft accelerates without added
thrust, as shown by the Acceleration Caret and the Airspeed Trend
Vector.
Figure 5-8:
Descending Turn
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 5-13
ILS Intercept
In PRI Mode, the HSI/CDI shows all course deviations whether Localizer,
VOR, or FMS. When ILS is selected, the glideslope scale and deviation
pointer are displayed.
Figure 5-9 shows:
• Autopilot is engaged at a 30° intercept heading (130°) to the ILS course
of 158°
• Heading Mark and HSI show selected heading
• The Selected Course and the Selected Course Mark (below the Zero-
Degree Pitch Line and on the HSI) show the ILS course. In this
example, the ILS course is outside field-of-view (158°), thus the
pointer is “ghosted” on the right end of Zero-Degree Pitch Line.
• Aircraft level at 3,000 feet with intercept from below glideslope
• Aircraft is 13.4 nautical miles from DME station
• Aircraft decelerates to selected airspeed of 150 knots.
Figure 5-9:
ILS Intercept
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
5-14 November 2002 9701-1153 Rev A
ILS Capture
Figure 5-10 shows the Combiner display immediately before ILS capture.
AIII mode is armed and the aircraft has completed the turn to the final
approach. When the ILS is captured, the HGS will automatically change to
AIII mode.
Figure 5-10:
ILS Capture
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 5-15
AIII Approach - Beginning the Approach
Figure 5-11 shows:
• AIII Mode active, RO Mode armed
• Aircraft on localizer and glideslope
• Guidance Cue is in center of Flight Path symbol and is above –3.00°
Reference Glideslope line (aircraft correcting to glideslope)
• Aircraft descends at 500 FPM through 1820 feet (1700 AGL) over the
Outer Marker (OM) at 5.8 nautical miles
• Aircraft decelerates through 135 knots toward selected airspeed of
130 knots
Figure 5-11:
AIII Approach
At the point Figure 5-11 shows, the HGS displays Localizer Deviation as
vertical bars laterally positioned relative to the Selected Course pointer and
Glideslope Deviation as horizontal bars vertically positioned relative to the
Reference Glideslope line. When centered, these bars create a cross in the
center of the display with the Flight Path and HGS Guidance Cue in the
middle.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
5-16 November 2002 9701-1153 Rev A
In AIII mode, the Guidance Cue gives pitch and roll commands derived by
the HGS and gives guidance all the way to touchdown.
AIII mode includes an approach monitoring function that is active from 500
feet AGL to touchdown. This monitor controls the “APCH WARN”
message in the event of a system fault (i.e., sensor, equipment or HGS
failure) or if the aircraft exceeds a performance monitor limit. Performance
monitoring is related to the left-side pilot’s ability to track the ILS and flare
guidance, and to the projected touchdown being within the required
touchdown limits, including excessive lateral and vertical position, airspeed,
sink rate, crosstrack rate and long landing.
HGS RO Mode: If RO Mode is enabled, it is automatically armed when
AIII Mode is active. “RO” shows to the right of the vertical line in the
upper left corner of the Combiner display (Figure 5-11). When RO Mode is
armed, “RO” flashes for 5 seconds and then is steady.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 5-17
AIII Approach—300 Feet
Figure 5-12 shows:
• Aircraft descends through 300 feet Radio Altitude
• Aircraft at 130 knots and on speed
• Runway Edge Lines show in perspective and are set relative to the
Conformal Selected Course Pointer to overlay “real-world” runway.
Figure 5-12:
AIII Approach—300 Feet
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
5-18 November 2002 9701-1153 Rev A
The environmental conditions for nominal CAT III operations are usually
stable, so the HGS symbology is stable. The pilot then:
• Centers and maintains the Flight Path symbol over the cue to track the
HGS Guidance Cue, and subsequently the ILS.
• Monitors raw localizer and glideslope data relative to their null
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