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The wide field-of-view Combiner (24° vertical by 30° horizontal) positions
and focuses the projected image to superimpose the symbology on the leftside
pilot’s view of the real world.
Combiner
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
2-4 November 2002 9701-1153 Rev A
Combiner Display Brightness
The Combiner display brightness control (HUD BRT) knob is located on
the upper right side of the Combiner (Figure 2-3). Turn the HUD BRT knob
to adjust the intensity.
• Rotate the knob clockwise to increase the display intensity.
• Rotate the knob counter-clockwise to decrease the display intensity.
Push the knob in to select the automatic (AUTO) brightness mode. Pull the
knob out to select the manual (MAN) brightness mode.
The light plate is energized from the “MISC OVERHEAD LIGHTS”
dimmer control.
Figure 2-3:
HGS Combiner
Auto Mode: In AUTO mode, the intensity of the display changes
automatically to maintain the contrast ratio set by the pilot. This gives a
constant contrast ratio relative to the light conditions, so the display is
visible without manual adjustment as the aircraft travels through different
light conditions. The range is from nearly off to the maximum contrast ratio
for the ambient light level.
Manual Mode: In MAN mode, the display intensity level does not change
after it is set. Thus, when the aircraft travels through different light
conditions, it is possible for the display to “disappear.” In manual mode,
display intensity can be any setting within the adjustable range—from no
visible display to maximum available intensity.
Stow
Lever
Brightness
Control
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 2-5
Combiner Sun Visor
The Combiner has a sun visor to use in bright light. The sun visor is easily
attached to and removed from the Combiner with Velcro®. When it is not
in use, keep the sun visor in a holder under the windscreen glare shield.
Combiner Positions
CAUTION: DO NOT USE FORCE TO MOVE THE
COMBINER GLASS OUT OF THE STOW,
NORMAL, OR BREAKAWAY POSITIONS.
Stow Position: the position of the Combiner glass when not in use. To stow
the Combiner glass from the normal position, push the stow lever
(Figure 2-3) and hold the Combiner glass by the edges. Rotate the
Combiner glass up and aft from the normal position to the stow position.
When the Combiner glass is stowed, a lock holds it tightly in place.
Normal Position: the position of the Combiner glass while in use. To move
the Combiner glass from the stow to the normal position, push the stow
lever and hold the Combiner glass by the edges. Lower the Combiner arm
until the Combiner glass is in the normal position detent. When the
Combiner glass moves into the normal position , the OHU projects
symbology onto the Combiner glass (after a warm-up period).
Breakaway Position: The Combiner can also breakaway forward from its
normal position. This feature allows the Combiner to rotate horizontally
forward and inboard during a sudden deceleration of the aircraft. The
Combiner is designed to stay in place if it rotates to its maximum
breakaway travel.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
2-6 November 2002 9701-1153 Rev A
Combiner Alignment Detector
The Combiner also contains an infra-red optical sensing system to precisely
monitor the normal position of the Combiner glass relative to the fixed part
of the Combiner structure (Figure 2-4). The Combiner Alignment Detector
(CAD) signals the OHU and HC if the Combiner is not within alignment
tolerances when in the normal position. Combiner alignment is critical
during visual operations (VMC mode) to make sure the HGS is symbology
is conformal with the real-world scene.
An out-of-tolerance condition causes “ALIGN HUD” to show on the
Combiner display. If “ALIGN HUD” shows, gently adjust the Combiner
glass to remove the message.
NOTE: If the “ALIGN HUD” message cannot be removed, do not use
the HGS.
Figure 2-4:
Combiner Alignment Detector
Emitter and Detector
(CAD)
Mirror
(CAD)
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 2-7
HGS Control Panel
The HGS Control Panel (HCP) is located in the aft right side of the center
pedestal and is available to both pilots (Figure 2-5).
Figure 2-5:
HGS Control Panel Location
The HCP allows the flight crew to select HGS modes and enter required
data. This data includes the glideslope angle, runway length and runway
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