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elevation. The HCP also displays selected modes, numbers entered, system
test, and status data.
The HCP (Figure 2-6) contains mode, function, and data-entry pushbuttons,
along with a display field. Four pushbuttons (RWY, G/S, CLR, and TEST)
contain lights to show when they are active.
The CLR, BRT+, DIM-, pushbuttons, and numeric keypad allow operators
to enter data. A FAULT light in the lower left corner of the HCP comes on
when an HGS BIT (Built In Test) detected fault occurs.
HGS
Control Panel
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
2-8 November 2002 9701-1153 Rev A
FLIGHT DYNAMICS
Figure 2-6:
HGS Control Panel (HCP)
The six primary HCP pushbuttons, and their associated displays, are:
ACT: Push the ACT pushbutton to move “PRI” from the STBY (standby)
line to the ACT (active) line and make PRI the active mode.
STBY: Push the STBY pushbutton to change the mode on the STBY line.
This change occurs only when “PRI” is on the ACT line.
NOTE: For more information related to ACT and STBY operations,
see “HGS Modes of Operation” (Section 3).
RWY: Push the RWY pushbutton to enter a new Runway Length or
Runway Touchdown Zone Elevation (TDZE). Typically, this is the data
printed on instrument approach plate or other airport documentation. The
RWY pushbutton data entry functions are covered in “Data-Entry
Functions” later in this chapter.
G/S: Push the G/S pushbutton to enter a new glideslope angle for the
landing runway (usually the glideslope angle that appears on instrument
approach plates and other approach documentation, or the desired glide path
angle for a visual approach). The G/S pushbutton data entry functions are
covered in “Data-Entry Functions” later in this chapter.
ENTER: Push the ENTER pushbutton to arm the mode on the STBY line.
Also, push to accept entries for runway length, runway elevation, and
reference glideslope angle as covered in “Data-Entry Functions” later in this
chapter.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 2-9
TEST: Push the TEST pushbutton to enter the maintenance test mode. The
TEST pushbutton light comes on and the ACT line shows TEST.
Three pushbuttons that control the HCP display are:
CLR: Push the CLR pushbutton to remove all symbology from the
Combiner. When the CLR is pushed, the pushbutton light comes on, and the
ACT display line shows “CLR.” All other HGS functions continue
normally.
The Combiner display returns when:
• The EGPWS senses a windshear condition
• The HGS senses an unusual attitude
• The go-around pushbutton is pushed
• The CLR pushbutton is pushed a second time
• The TEST pushbutton is pushed (on ground only).
NOTE: During data entry and TEST operations, the CLR pushbutton
functions as a backspace pushbutton.
BRT+: Push the BRT+ pushbutton to increase the HCP’s display
brightness.
DIM–: Push the DIM– pushbutton to decrease the HCP’s display
brightness.
NOTE: When the RWY and G/S data entry functions are in use, or
when the TEST mode is in use, the BRT+ and DIM–
pushbuttons have different functions.
Data-Entry Functions
Use the data-entry functions to set the runway length, runway elevation, and
a reference glideslope angle.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
2-10 November 2002 9701-1153 Rev A
Runway Length Data Entry
For HGS-guided takeoffs and AIII approaches with rollout (if enabled), set
the runway length, which can be in feet or meters (if enabled).
Follow these steps to set a new runway length. Figure 2-7 shows an
example.
1. Push and release the RWY pushbutton until the RWY line shows an
“L”, followed by a solid arrow that points to the right, and the last
accepted length. The RWY pushbutton light comes on.
2. Use the HCP keypad to enter the new runway length. The last accepted
length is then replaced with the new length and a flashing cursor (“_”).
Use the numeric keypad to put in the first number of the new runway
length. Continue to use the keypad until the new runway length shows
on the RWY line. If five digits are put in, the system removes the
cursor and ignores further keypad entries. If an error is made, push the
CLR pushbutton as a backspace. Each push of the CLR pushbutton
erases the last digit.
NOTE: The HGS accepts only runway lengths from 5,000 to 13,500
feet (or 1,524 to 4,115 meters). If the runway length is longer
than the upper limit, then “L 13500?” (or “L 4115?”) on the
　
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