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Figure 12---70---16 Sheet 2
Flight Path
Symbol
23 24
LOC 1
5.7 NM
--0.7 VS
5
AP
10
1700
140 --5
130 GS
--3.00
--5
--10 --10
1820 B
--3.00
5
Flight Path
Acceleration
Symbol
Roll Indicator
Slip/Skid Indicator
Heading Bug
Glideslope and Index
Reference
Line
Glideslope
Readout
HGS Guidance
Cue
Removed from
the display at
touchdown.
Lateral
Deviation
Line and
Glideslope
Line
Selected
Course
Bug
Airspeed Error Symbol
A III
A loss of the applicable approach capability is
indicated by boxing and flashing the active AIII
mode annunciator.
HGS control panel will annunciate ‘NO AIII’.
Copilot’s PFD will display a red AIII message.
Loss of Approach Capability Flag
A III
Approach Warning Message
(Category IIIa at 500 feet)
Indicates that HGS Category IIIa limits have
been exceeded, or the autopilot is still
engaged at 500 feet.
Copilot’s PFD will display APCH WARN (red
and boxed) message.
APCH WARN
The glideslope line is
removed from the
display at 70 feet AGL.
Vol. 1 12--70--39
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual
CSP A--013
MASTER
Category IIIa (AIII) Model Approach and Landing
Figure 12---70---16 Sheet 3
160
23 24
LOC 1
5.7 NM
--0.7 VS
5
AP
10
140 --5
130 GS
--3.00
--5
--10 --10
280 B
--3.00
5
A III
Runway Symbol
Represents the airplane’s orientation relative to the runway.
Displayed from 300 feet to 60 feet AGL. Position depends upon
runway elevation, airplane heading, altitude, course setting,
localizer deviation, and system resolution.
Tick marks indicate runway aim point, which
represents 1,050 feet from the runway threshold.
Lines represent outline of runway threshold,
scaled to a width of 200 feet.
MM
During a Category III
approach, message
comes on at 1,000 feet
and at 650 feet AGL,
flashes for 10 seconds,
to indicate that the
autopilot must be
disconnected. An
approach warning
message comes on if
the autopilot is not
disengaged by 500
feet AGL.
Autopilot Disconnect
Message
DISC
IDLE Command
Displayed during
Category IIIa
operations, when
the HGS has
determined that
the thrust levers
must be selected
to IDLE.
IDLE
LOC 1
NM
--0.6 VS
138 --5
GS
--3.00
--5
--10 --10
B
--3.00
125
1.1
30
150
The symbol cues the pilot as to where to expect the real runway
when adequate visibility is achieved and is used as an additional
altitude awareness cue.
REV 56, Jan 31/03
Vol. 1 12--70--40
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual MASTER
CSP A--013
Category IIIa (AIII) Model Approach and Landing
Figure 12---70---16 Sheet 4
5 5
10
23 24
LOC 1
NM
5 VS
--5
GS
--3.00
--5
--10 --10
B
--3.00
HGS/AFCS Mode Annunciator
Autopilot Mode
Annunciator
Comes on if a flare command is not available.
Indicates that the flare maneuver should be
initiated but not how to perform the maneuver.
+ +
Flare Cue
(Double cross symbol)
Flare cue, when flare command is available;
Compass rose, Airspeed Tape, Altitude Tape
and their associated symbols.
The following symbols / readouts are not available when in AIII mode:
Flare Command
+
(Single cross symbol)
Displayed only during a Category IIIa
approach. Provides guidance on how
to perform the correct flare maneuver.
135 125
123
0.9
--0.4
If pitch compression
occurs in AIII mode,
a “NO AIII” message
is annunciated on the
HCP and the HGS
mode is removed
from the combiner.
NOTE
A III
Active Mode
(HGS)
AIII
+
IM
Vol. 1 12--70--41
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual
CSP A--013
MASTER
Rollout Mode
Figure 12---70---17
24
80
23
LOC 1
0.7 NM
0.0 VS
Active Mode
(HGS)
　
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