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increments. The display window range is 2250 feet. The scale moves down for
increasing altitude.
Barometric Pressure Display
Barometric pressure correction is numerically displayed in either inches of mercury or
in hectopascals (hPa). The correction value and format are set by the on-side ADRP.
Preselect Altitude Display
The preselected altitude is numerically displayed in magenta above the barometric
altitude scales. The ALT knob on the FCP sets the value.
A metric preselected altitude readout with an “M” label may also
be displayed below the normal display. The boxed readout
displays the preselected altitude in meters.
NOTE
NOTE
FLIGHT INSTRUMENTS
For Training Purposes Only
May 03
11-27
P I LOT T R A I N I N G GU I D E
PFD Altitude Displays
Figure 11-14
Preselect Altitude Bug
The ALT set knob on the FCP is used to set the preselected altitude value. The preset
altitude is displayed on the top of the altitude scale in magenta, and as a window on the
coarse and fine altitude scales.
This four-line marker displays on the coarse and fine barometric altitude scales to
mark the preselected altitude value. The marker is always in view on the coarse
barometric altitude scale and then shows on the fine barometric altitude scale when in
range.
2
R
T
180
160
140
120
100
20
10
10
20
300
200
100
000
400
8000
GPS APPR
ADF1
TRU
NO FLIGHT PLAN
29.96 IN
2400M
GS
RA
LNV1
LOC 1
DR VGP
AP
FMS1
1
DTK 071
.7
ONB
NM
4
4
2
2
1
1
0.8
2500M
N
33
S
15
12
E
6
3
2
1500
MDA 840
128
0.7
M.576
1500
260
220
240
280
20
10
10
20
200
100
100
000
800
8000
TERM
VOR1
TRU
NO FLIGHT PLAN
29.92 IN
6700M
GS
RA
HDG
LOC 1
DR ALTS
AP
FMS1
21
DTK 279
.6
HOKKE
NM
4
4
2
2
1
1
6710M
N
2
S
15
12
E
6
3
22
22000
VOR2
250
M.584
P604_11_028
1800FT
Coarse
Altitude
Scale
Fine
Altitude
Scale
Preselect
Altitude
FMS VNAV
Altitude
Preselect
Altitude Bug
(Coarse Scale)
Preselect
Altitude Bug
(Fine Scale)
Selected Altitude
Metric Readout
Altitude Metric
Readout
Barometric
Pressure
Display
300
200
400
1
2
FLIGHT INSTRUMENTS
11-28 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
The preselected altitude display and bug both change colors and/or flash as the
airplane acquires a preselected altitude. These displays are normally magenta. Both
displays flash magenta when the airplane approaches the preselected altitude and then
become steady again at altitude capture.
Preselect Altitude Warnings
Preselect altitude warnings provide aural and visual signals. The aural warning signal
is a one-second C-chord tone. After capture, the digital display flashes amber for
minor altitude deviations. The bug and numeric display both flash amber for major
altitude deviations.
The Air Data Computers use the preselected altitude data to initiate two different types
of cues and warnings. These cues and warnings are initiated when the difference
between the preselected and barometric altitude is greater than the programmed limits.
The programmed limits are:
• minor deviation is ± 200 feet
• major deviation is ± 1000 feet
(See Chapter 4 Automatic Flight Control System for additional altitude preselect
tracking information)
Preselect Altitude Cross-Side Tracking
Each ADC receives the preselected altitude via its on-side ADRP and the cross data
bus. The ADCs compare the preselected altitude values of the two computers. If the
values are not equal due to a bus failure, the digital preselect altitude indication
changes from magenta to cyan when the adjustment knob is turned. If full bus
operation is recovered, the two sides will synchronize to the value held by the coupled
side ADC. The indication returns to magenta after synchronization has been achieved.
MDA Display
The Minimum Descent Altitude (MDA) is numerically displayed below the altitude
　
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