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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
scale. The on-side ADRP is used to select this display and set the appropriate value.
An MDA alert displays near the left center of the ADI when the airplane is at the
Minimum Descent Altitude. During the MDA alert the icon flashes yellow.
MDA Pointer
A cyan pointer marks the selected Minimum Descent Altitude on the fine barometric
altitude scale. This pointer appears when the MDA display is selected and the value is
in the display range. This pointer flashes during an MDA alert.
FLIGHT INSTRUMENTS
For Training Purposes Only
Jan 04
11-29
P I LOT T R A I N I N G GU I D E
Decision Height Display
The Decision Height value is selected for display and set by the on-side ADRP. If this
display is selected, it is automatically displayed once the aircraft has descended
through 2500 feet above ground. If Decision Height data becomes invalid, the numeric
values are replaced with red dashes.
A DH alert displays when the airplane is at or below Decision Height. On the right
center of the attitude indicator, DH flashes in yellow, accompanied by the voice alert
“MINIMUMS”.
There is also a DH Pointer which marks the selected Decision Height on the analog
radio altitude scale. This pointer appears when the DH display is selected and the
value is in the display range.
MDA and DH Displays
Figure 11-15
2
R
T
160
140
120
100
20
10
10
20
900
000
800
700
RWY
GPS APPR
ADF1
NO FLIGHT PLAN
29.85 IN
2400M
LNV1 DR VGP
ALTS
AP
FMS1
1
DTK 072
.3
RW07
NM
4
4
2
2
1
1
0.6
129
N
33
S
15
12
E
6
3
0
900
MDA 840
M.452
TA
ONLY
430FT
4
3
2
5
6
DH 100
MDA
2
R
T
160
140
120
100
20
10
10
20 300
400
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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