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crosstrack rate, vertical speed, lateral and longitudinal position
S For possible unsafe landings by evaluating the sink rate, lateral displacement from
runway centerline, airspeed relative to selected airspeed, crosstrack rate, roll angle,
and distance traveled along the runway.
H. System Test/Fault Codes
The HGS continuously checks its operational status and if a fault is detected the system
will blank the CRT and the combiner. EICAS and the PFDs will display applicable HGS
failure / approach warning messages. The HGS control panel FAULT lamp will come
on, the HGS control panel LED unit will display an applicable fault code.
I. HGS Mode Selections/Indications
The HGS control panel is used to enter runway and glideslope data, to accomplish
testing troubleshooting, to select HGS modes and to display the mode in use. Modes
are indicated on the control panel as follows:
S The CRT line adjacent to the ACT key indicates the current active mode
S The CRT line adjacent to the STBY key indicates the next available / next selectable
mode
S The CRT line to the far right side of the STBY key indicates HGS capability (AIII,
AII, AI).
The flight mode annunciator area of the HGS combiner and the PFDs will echo the
corresponding HGS mode.
REV 56, Jan 31/03
Vol. 1 12--70--20
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual MASTER
CSP A--013
HGS System --- EICAS Messages <MST>
Figure 12---70---7
Status Page
HGS FAIL
<0039>
<0039>
HGS FAIL
Status (White)
Comes on to indicate
head up guidance
system failure.
Vol. 1 12--70--21
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual
CSP A--013
MASTER
Primary Mode --- Radio Altitude Indications
Figure 12---70---8
AP
10
SYNC
PRI
HDG
ALT
LOC 1
GS
21
1700
M .545
240
220
200
180
160
VOR 1
10.0 NM
190 GS
ADF1
ADF2
0.0 VS
21
30
2 000
100
900
800
00
000
1
Flashing characters
indicate that the
airplane has arrived at
the selected decision
height.
During go--around,
alert is disabled at
DH +100 feet.
Alerts inhibited
below 5 feet.
Selected Decision
Height Readout
(Example: DH 100)
Indicates decision height, in
1--foot increments as set at
DH knob on altitude
reference panel (range is 0 to
999 feet).
Radio Altitude Readout
Indicates radio altitude
from 0 to 2,500 feet.
50--foot increments from
2,500 to 1,000 feet;
10--foot increments from
1,000 to 50 feet;
5--foot increments from
50 to10 feet;
1--foot increments from
10 to 0 feet;
Negative radio altitude
is displayed as 0 feet.
Below 2,500 feet AGL, a radio altimeter failure is
indicated by the above failure flag and the radio
altitude readout is removed.
A comparison between the two radio altitude
sources is only performed below 1,000 feet
AGL. A miscompare is indicated by the same
failure flag but the radio altitude readout is
retained. The flag flashes for 5 seconds when
the miscompare is first detected and thereafter
remains displayed until the condition is
corrected.
APPROACHING MINIMUMS
MINIMUMS
FIVE HUNDRED
DECISION HEIGHT
FIFTY
FORTY
THIRTY
TWENTY
TEN
Decision Height Alert
Example: DH 100
RA Failure Flag
10
32 000
DH 100
MDA 740
RA
REV 56, Jan 31/03
Vol. 1 12--70--22
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual MASTER
CSP A--013
HGS /AFCS Modes
Figure 12---70---9 Sheet 1
10 10
AP
SYNC
PRI
HDG
ALT
A
LOC 1
GS
5 5
24
M .545
2 000
100
900
000
1
HGS/ AFCS Mode Annunciator
Selectable Approach Mode
(HGS)
Armed Lateral Mode
(AFCS)
Armed Vertical Mode
(AFCS)
Active Mode
(HGS)
Captured Lateral Mode
(AFCS)
Captured Vertical Mode
(AFCS)
Active HGS Mode
PRI Primary
AIII Approach Category III
AII Approach Category II
AI Approach Category I
F/D Flight Director
VMC Visual Meteorological
Conditions
Selectable Approach HGS Mode
PRI Primary
AIII Approach Category III
AII Approach Category II
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