Figure 2-8:
Runway Elevation Data Entry (example)
Automatic Operations of Runway Elevation: The automatic operation for
runway elevation data entry is:
• If the ENTER pushbutton is not pushed after a new runway elevation is
entered, the new number is not accepted. If the STBY, RWY, G/S, or
ACT pushbutton is pushed before the ENTER pushbutton is pushed,
the runway elevation goes back to the number and status that were set
when data entry started.
• After a power interruption or HC reset in flight, the runway elevation
goes back to the last number and status set.
• After a power interruption or HC reset on the ground, the runway
elevation becomes invalid (RWY line shows a “?”).
• When the aircraft lands and the airspeed is less than 20 knots, the
runway elevation becomes invalid (RWY line shows a “?”).
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
2-14 November 2002 9701-1153 Rev A
Reference Glideslope Angle Data Entry
Set the reference glideslope angle to use the HGS for approach and landing.
The reference glideslope angle data entry limits are 0.00 to –9.99°.
Follow these steps to set a new reference glideslope angle number.
Figure 2-9 shows an example.
1. Push and release the G/S pushbutton. The G/S line shows a solid arrow
that points to the right, a minus sign (“–”), and the last accepted
reference glideslope angle. The G/S pushbutton light comes on.
2. Use the keypad to put in the reference glideslope angle. When the
keypad is pushed, the last accepted reference glideslope angle is
removed and replaced with the new number, a space, and a flashing
cursor (“_”). If three digits are put in, the cursor is removed and any
other keypad entries are ignored. If an error is made, push the CLR
pushbutton as a backspace and erase the last number. Push the G/S
pushbutton to erase the entire entry.
3. After the correct numbers show on the G/S line, push the ENTER
pushbutton to accept the new reference glideslope angle. This step adds
“°” for degrees after the number. The G/S pushbutton light goes off.
Figure 2-9:
Glideslope Data Entry (example)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 2-15
Automatic Operations of Reference Glideslope Angle: The automatic
operation for reference glideslope angle data entry is:
• If the ENTER pushbutton is not pushed after a new reference
glideslope angle is entered, the new number is not accepted. If the
STBY, RWY, G/S, or ACT pushbutton is pushed before the ENTER
pushbutton is pushed, the reference glideslope angle goes back to the
number and status that were set when data entry started.
• After a power interruption or HC reset in flight, the reference
glideslope angle goes back to the last number and status set.
• After a power interruption or HC reset on the ground, reference
glideslope angle becomes invalid (G/S line shows a “?”).
• When the aircraft lands and the airspeed is less than 20 knots, the
reference glideslope angle becomes invalid (G/S line shows a “?”).
HCP Display Brightness
Use the HCP BRT+ and DIM- pushbuttons and the DSPL cockpit
brightness control to set the intensity of the HCP to the intensity of the
Radio Tuning Unit (RTU) and the FMS CDU displays:
1. Set the DSPL control at a point where the RTU and the FMS CDU first
go off.
2. Push and hold the HCP BRT+ or DIM- pushbuttons to a point where
the HCP display first goes off.
3. Use the cockpit DSPL control to adjust the intensity of the HCP, RTU
and FMS CDU displays to a satisfactory level.
The backlighting of the HCP is set with the INTEG cockpit brightness
control so that the backlighting of the HCP is the same as other cockpit
panels.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
2-16 November 2002 9701-1153 Rev A
HGS Computer (HC)
The Head-Up Guidance Computer (HC) (Figure 2-10) receives input signals
from aircraft sensors and equipment and converts the data to symbology.
The HC also evaluates system performance using extensive Approach
Monitor, Built-in Test, and input validation processing. The HC is installed
in the avionics bay below the cabin floor.
Figure 2-10:
HGS Computer
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 2-17
HGS Overhead Unit (OHU)
The Overhead Unit (OHU) is located above the left pilot’s head
(Figure 2-11) and positioned relative to the Combiner so that symbols such
as the Glideslope Reference Line overlay the corresponding features of the
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