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Vol. 1 12--70--49
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual
CSP A--013
MASTER
Primary Mode --- Barometric Altitude Indications
Figure 12---70---21 Sheet 1
Analog indication of the
airplane’s barometric corrected
altitude. Displayed only during
the primary mode.
Moving vertical scale with fixed
index (digital readout window)
that indicates barometric
corrected altitude, ranging
from --200 to 50,000 feet, with
440 feet always in view.
The scale is similar in format
and operation to the altitude
tape in the PFDs.
Small tick marks every
20 feet.
Large tick marks every 100
feet with their corresponding
numerical values in
hundreds.
The thousands numerical
values are contained within
the altitude index (window).
Altitude Select Bug
Double lines indicate
selected altitude as set at
ALT knob on flight control
panel. Displayed only when
selected altitude is within
the scale in view.
Altitude Index
Altitude readout
window which indicates
the airplane’s current
barometric corrected
altitude.
200
100
000
900
800
3200
3
NOTE
Ensure that the landing field
elevation is correctly set at the
HGS control panel and the cabin
pressurization selector panel.
Cross--check barometric pressure
setting on PFDs and standby
altimeter.
10 10
AP 10
SYNC
PRI
HDG
ALT
LOC 1
GS
5 5
21
1700
--5 --5
M .545
240
220
200
180
160
VOR 1
10.0 NM
190 GS
ADF1
ADF2
HDG 210
0.0 VS
21
30
2 000
100
900
800
00
000
1
Barometric Altitude Indicator
(Tape)
ELV 200
Runway Elevation Readout
(Example: ELV 200)
Digital indication of the
runway’s elevation, in 1--foot
increments.
Displayed and remains on
for 5 seconds, anytime the
runway elevation value is
changed at the HGS control
panel..
REV 56, Jan 31/03
Vol. 1 12--70--50
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual MASTER
CSP A--013
Primary Mode --- Barometric Altitude Indications
Figure 12---70---21 Sheet 2
Selected Altitude Readout
Indicates the selected
altitude value, with double
lines drawn over and under
the hundreds digits.
Displayed in 100--foot
increments (rounded--off to
the nearest 100 feet).
Flashes for 5 seconds
when1,000 feet away from
target (selected) altitude.
ALT
Altitude Failure Flag
An altitude failure is indicated by the
above failure flag and all altitude
information is removed from the display.
A miscompare between the altitude
sources is indicated by the same failure
flag but altitude data is retained. The
flag flashes for 5 seconds when the
miscompare is first detected and
thereafter remains displayed until the
condition is corrected.
10 10
AP
10
SYNC
PRI
HDG
ALT
LOC 1
GS
5 5
21
1700
--5 --5
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
ELV 200
1. The HGS does not display
barometric pressure indications.
Cross--check barometric pressure
setting on PFDs and standby
altimeter.
2. The HGS does not display
barometric altitude in meters.
NOTE
Negative Altitude
Indicator
Annunciates altitudes
less than 0 feet.
000
900
800
700
600
Consists of the characters ‘MDA’
which indicates the airplane’s
passage of the selected minimum
descent altitude. The MDA
message comes on at the MDA
and flashes for 2 seconds and
thereafter remains displayed until
touchdown or until the airplane
climbs above the selected MDA
plus 100 feet.
MDA 740 B
Selected MDA Readout
(Example: MDA 740)
Digital indication of the
selected MDA, in 10--foot
increments.
Displayed and remains on
for 5 seconds, anytime the
MDA value is selected on the
air data reference panel.
Minimum Descent Altitude
(MDA) Alert
10
32 000
DH 100
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