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outside world.
Figure 2-11:
OHU Location
OHU
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
2-18 November 2002 9701-1153 Rev A
The Overhead Unit (OHU) (Figure 2-12) contains CRT and projection
optics to display symbolic images on the Combiner. The OHU also contains
circuitry to control display intensity and monitor the Combiner’s position.
Figure 2-12:
Overhead Unit (OHU)
HGS Head-Down Data
The HGS head-down data is shown on the PFDs and the EICAS.
The PFD shows the active and armed HGS modes and the command field
(Figure 2-13). When the flight crew selects an HGS mode, it flashes for 10
seconds and then is steady. If a mode becomes invalid, the message flashes
for 10 seconds and is then removed. Refer to Table 2-1 for PFD message
color indications. If the HGS fails, all PFD HGS data is removed and a redboxed
“HGS” flashes in the PFD HGS command field (Table 2-2) for ten
seconds and then either is steady (if the decision height is less than 100 feet)
or is removed (if the decision height is 100 feet or greater).
The EICAS also shows messages about data and conditions for the HGS. If
the HGS senses an internal fault, “HGS FAIL” shows in white as a status
message on the upper right part of the EICAS display.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 2-19
Figure 2-13:
PFD with HGS Data (example)
HGS
Active Mode
HGS
Armed Mode
HGS
Command Field
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
2-20 November 2002 9701-1153 Rev A
Table 2-1: HGS PFD Modes
HGS Mode Color Specifies:
AIII Yellow AIII Mode on STBY; AIII conditions not satisfied
AIII White AIII Mode armed
AIII Green AIII Mode active
AII Yellow AII Mode on STBY; AII conditions not satisfied
AII White AII Mode armed
AII Green AII Mode active
AI Yellow AI Mode on STBY; AI conditions not satisfied
AI White AI Mode armed
AI Green AI Mode active
RO Yellow RO Mode not valid
RO White RO Mode armed
RO Green RO Mode active
TO Yellow TO Mode not valid
TO White TO Mode armed
TO Green TO Mode active
Table 2-2: HGS PFD Command Fields
Command Color Specifies:
APCH WARN Red Approach Warning
FLARE Green Flare maneuver
RO CTN Yellow Rollout caution
TO WARN Red Takeoff warning
HGS Red HGS fail
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 3-1
Section 3:
HGS Modes of Operation
Introduction
The HGS Control Panel (HCP) always shows the current mode of operation
on the ACT display line and the next available mode on the STBY display
line. In Figure 3-1, PRI is the current mode and VMC is the next available
mode.
FLIGHT DYNAMICS
Figure 3-1:
HGS Control Panel (HCP)
Push the STBY pushbutton to change which mode shows on the STBY line.
Push the ENTER pushbutton to arm the mode that shows on the STBY line
(the question mark is removed).
When the armed mode conditions are met, the mode becomes the active
mode and is shown on the ACT line.
When a mode other than PRI is active, PRI is the next available mode and is
shown on the STBY line. To select PRI mode, push the ACT pushbutton.
NOTE: PRI is the only mode that is selected with the ACT pushbutton.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
3-2 November 2002 9701-1153 Rev A
The Model 4200 HGS has eight modes of operation. The eight HGS modes
are:
Primary Mode (PRI): available during all phases of flight from takeoff to
landing.
Takeoff Mode (TO): available for low-visibility takeoff (LVTO) with
expanded LOC guidance.
AIII Approach Mode (AIII): available for manual ILS approach and
landing operations to Cat III minimums.
Rollout Mode (RO): available on the ground for runway guidance after a
successful AIII approach and touchdown. Upon touchdown, the AIII mode
automatically changes to RO (if enabled).
AII Approach Mode (AII): available for manual ILS approach and landing
operations to CAT II minimums. With the applicable regulatory authority,
use AII for CAT II approaches at Type 1 airfields.
AI Approach Mode (AI): available for manual ILS approach and landing
operations to CAT I minimums. Use also during coupled autopilot
approaches to monitor autopilot performance.
Flight Director Mode (F/D): available for Flight Director approaches that
are either manual or autopilot coupled.
Visual Meteorological Conditions Approach Mode (VMC): available for
visual approaches. No FCS or HGS guidance is available in VMC mode.
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