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• Approach and landing performance (below 500 feet AGL).
If the monitor finds a sensor or input data problem, or a BIT fault, AIII
capability is lost. These changes occur if any condition causes a loss of AIII
capability:
• “NO AIII” shows on the HCP ACT line (Figure 3-8).
• “NO AIII” flashes for 5 seconds and then is steady on the Combiner
display (Figure 3-9).
• “AIII” shows in yellow on the PFDs.
• The Guidance Cue is removed from the Combiner display.
If the aircraft is above 500 feet AGL, these “NO AIII” displays stay until
the HGS regains AIII capability, or until PRI Mode is selected.
Figure 3-8:
NO AIII Display on HCP
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-14 November 2002 9701-1153 Rev A
Below 500 feet AGL, if AIII capability is lost, or approach and landing
performance is out of tolerance, an approach warning occurs: “APCH
WARN” shows on Combiner display (Figure 3-9) and in red on the PFDs.
If an approach warning occurs, the left-side pilot should do a go-around,
unless adequate visual cues are available.
Use of autopilot: If the autopilot is engaged and the HGS AIII Mode is
active below 1000 feet AGL, “DISC” shows on the Combiner display as a
reminder to disconnect the autopilot. If the autopilot is still engaged below
650 feet AGL, “DISC” flashes on the Combiner. Below 500 feet AGL, an
approach warning occurs.
Figure 3-9:
NO AIII and Approach Warning (example)
NOTE: Figure 3-9 shows a glideslope failure at 300 feet that causes a
loss of AIII. “APCH WARN” and “NO AIII” show on the
Combiner display, and glideslope raw data and the Guidance
Cue are removed from the Combiner display.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-15
RO Mode
The HGS RO Mode (if enabled) gives guidance to track the runway
centerline after an AIII approach (Figure 3-10).
RO Mode Requirements and Conditions
RO Mode is automatically armed when these conditions are met:
• All reversion selections (ATTD HDG, AIR DATA, EICAS, DISP
CONT, MFD reversion) are in NORM position.
• All sensors/input data are valid.
• There are no HGS BIT faults.
• #1 and #2 VHF NAV receivers are set to the localizer frequency.
• Runway length is set within defined limits before the aircraft descends
below 500 feet AGL.
• AIII Mode is active.
RO shows as the armed mode on the Combiner display and on the PFDs.
RO Mode Selection
The HGS changes automatically to RO Mode at touchdown after an AIII
approach.
When RO is the active mode:
• “RO” shows on the HCP ACT line, on the upper left of the Combiner
display, and in green on the PFDs.
• The Combiner display shows RO Mode symbology.
• PRI Mode is automatically set as the standby mode.
RO Mode stays the active mode until ground speed is less than 20 knots.
The HGS then changes to PRI Mode.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-16 November 2002 9701-1153 Rev A
Figure 3-10:
RO Mode Symbology (example)
RO Mode Monitor
In RO 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, RO
capability is lost. These changes occur if any condition causes a loss of RO
capability:
• “NO RO” shows on the HCP ACT line.
• “NO RO” flashes for 5 seconds and then is steady on the Combiner
display.
• “RO” shows in yellow on the PFDs.
• The Guidance Cue is removed from the Combiner display.
If RO capability is lost, a rollout caution occurs: “RO CAUTION” shows on
the Combiner display and “RO CAUT” shows in red on the PFDs.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-17
AII Approach Mode
NOTE: Obtain operational approval from the appropriate regulatory
authority before conducting HGS low-visibility operations.
The HGS AII mode is specifically designed for manual ILS approach and
landing operations to CAT II minimums. The AII Approach Mode
symbology (Figure 3-11) has the same format as the AIII Approach Mode
symbology.
NOTE: In AII mode, the guidance cue is removed at 80 feet AGL.
Figure 3-11:
AII Approach Mode Symbology (example)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-18 November 2002 9701-1153 Rev A
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