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AII Mode Requirements and Conditions
These AII conditions are necessary to arm AII Mode:
• The runway elevation is set.
• The G/S angle is set.
• IRS #1 and IRS #2 are in NAV mode.
• All reversion selections (ATTD HDG, AIR DATA, EICAS, DISP
CONT, MFD reversion) are in NORM position.
• Basic attitude (pitch, roll, heading) data are within limits.
• All sensors/input data are valid.
• There are no HGS BIT faults.
• #1 and #2 VHF Navigation Receivers are tuned to the same localizer
frequency.
• FCS armed lateral and vertical modes are LOC and GS.
• The aircraft is above 800 feet AGL.
NOTE: AII Mode can be selected on the STBY line before some of the
conditions necessary to arm the mode are met. “AII” (with no
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 AII can become the active mode, FCS captured modes must be LOC
and GS.
AII Mode Selection
Use this procedure to arm AII Mode:
NOTE: AII must be armed above 800 feet AGL.
1. Push the ACT pushbutton.
2. Push the STBY pushbutton until “AII?” shows.
3. Push the ENTER pushbutton.
The AII Mode is now armed. “AII” shows on the HCP STBY line. When
the FCS captures LOC and GS modes, “AII” flashes in the upper left corner
of the Combiner display, and the HGS changes to AII Mode.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-19
When AII is the active mode:
• “AII” 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 AII Mode symbology.
• PRI Mode is automatically set as the standby mode.
AII Mode Approach Monitors
In AII Mode the HGS monitors these requirements:
• Sensors and input data
• HGS system integrity (BIT faults)
• Approach and landing performance.
If the monitor finds a sensor or input data problem, or a BIT fault, AII
capability is lost. These changes occur if any condition causes a loss of AII
capability:
• “NO AII” shows on the HCP ACT line (Figure 3-12).
• “NO AII” flashes for 5 seconds and then is steady on the Combiner
display (Figure 3-13).
• “AII” 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 AII” displays stay until the
AII conditions are met, or until PRI Mode is selected.
Figure 3-12:
NO AII Display on HCP
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-20 November 2002 9701-1153 Rev A
Below 500 feet AGL, if AII capability is lost, or approach and landing
performance is out of tolerance, an approach warning occurs: “APCH
WARN” shows on Combiner display (Figure 3-13) 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.
NOTE: A coupled approach below 500 feet AGL results in an
approach warning.
Figure 3-13:
NO AII and Approach Warning (example)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-21
AI Approach Mode
NOTE: Obtain operational approval from the appropriate regulatory
authority before conducting HGS low-visibility operations.
The HGS AI mode is specifically designed for manual ILS approach and
landing operations to CAT I minimums. The AI Approach Mode
symbology (Figure 3-14) has the same format as the AIII Approach Mode
symbology.
NOTE: In AI mode, the guidance cue is removed at 80 feet AGL.
Figure 3-14:
AI Approach Mode Symbology (example)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-22 November 2002 9701-1153 Rev A
AI Mode Requirements and Conditions
These AI conditions are necessary to arm AI Mode:
• The runway elevation is set.
• The G/S angle is set.
• IRS #1 and IRS #2 are in NAV mode.
• Basic attitude (pitch, roll, heading) data are within limits.
• All sensors/input data are valid.
• There are no HGS BIT faults.
• #1 and #2 VHF Navigation Receivers are tuned to the same localizer
frequency.
• FCS armed lateral and vertical modes are LOC and GS.
• The aircraft is above 800 feet AGL.
NOTE: AI Mode can be selected on the STBY line before some of the
conditions necessary to arm the mode are met. “AI” (with no
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