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P IN
P
OUT
P
P
P
P
S
S
S
S
P3
P1
P2
P/S
DRAINS DRAINS
0
9
8
7
6
5
4
3
2
1
100 FEET
ALT
1 000 32
4
10 13
mb/hPa
29 9 2
IN HG
IAS KNOTS
180 200 220 250
BARO
MACH TRANSDUCER
PITOT
CLOSED
STATIC
CLOSED
For Training Purposes Only
Sept 04
7-67
P I LOT T R A I N I N G GU I D E
ELECTRONIC DISPLAY SYSTEM
AIR DATA SYSTEM
The air data system provides computed air data (speed, altitude and temperature data)
to various systems:
• Integrated Avionics Computers (IAC)
• Data Acquisition Units (DAU)
• Inertial Reference System (IRS)
• Stall Protection Computer (SPC)
• Electronic Display System (EDS) – EFIS and EICAS
• Automatic Flight Control System (AFCS)
Pitot and static pneumatic inputs and total air temperature provide raw air data
information to the ADCs. Static input to each ADCs absolute sensors produces the
altitude sensor data. Static and pitot inputs to each ADCs differential sensor produces
the airspeed sensor data.
Each ADC computes the following:
• Pressure altitude and barometric-corrected altitude
• Vertical speed, indicated airspeed, Mach number and true airspeed (TAS)
• Static Air Temperature (SAT), Total Air Temperature (TAT), and temperature
variations from ISA
• IAS reference (SPD switch on guidance panel, FMS or manual input)
• Vertical speed reference (VS switch on guidance panel)
• Attitude reference
• Airspeed and altitude trend vector
• Alerts
• Static source error correction
• Maximum speed values
• Overspeed warning
The reversion control panel, located on the pedestal, is used for pilot input to the air
data system and was covered earlier in this chapter.
P I LOT T R A I N I N G GU I D E
ELECTRONIC DISPLAY SYSTEM
7-68 For Training Purposes Only
Sept 04
PRIMARY FLIGHT INSTRUMENTS
PFD 1 and PFD 2 are digital CRT-based versions of the traditional (analog/
mechanical) flight instruments. Input to the PFDs is derived from the ADCs and IRS
units selected, and commands set on the PFD control panel, and the MFD control
panel. The PFDs function as the following flight instruments:
• Attitude Director Indicator (ADI)
• Horizontal Situation Indicator (HSI)
• Radio Magnetic Indicator (RMI)
• Attitude Indication
• Radio Altimeter Indicator
• Airspeed Indicator (Mach and IAS)
• Vertical Speed Indicator (VSI)
The mode annunciator panel for flight director and autopilot is above the ADI display,
directly on the PFD. Messages and cues for windshear alerts, TCAS traffic alerts and
commands are also provided on the ADI.
For Training Purposes Only
Sept 04
7-69
P I LOT T R A I N I N G GU I D E
ELECTRONIC DISPLAY SYSTEM
PRIMARY FLIGHT DISPLAY
220
200
190
180
170
160
150
LIM HDG
9500
210 BARO 29.92 IN
AP1 ASEL
AT1
VTA
SPD VAPP VNAV
M
0.856M
DTK
360
HDG
330
SRP
1000
VS 1000
54
MSG 0
1
2
3
1
2
3
9500
10500
10000
VOR 1
VOR 2
ATT2
ADC1
20 20
10 10
10 10
20 20
1300
200
185
6
4
10400
20
00
80
60
95
N
33
30
W
24
21
S
15
12
E
6
3
H23.4NM
FMS1
GX_07_042
Navigation
Annunciation
Airspeed
Indication
Autothrottle
Annunciation
Flight Director/Autopilot
Mode Annunciations
Source
Annunciation
Altitude
Indication
BARO Set
Vertical Speed
Target Readout
Compass
Vertical Speed
Indication
Honeywell
P I LOT T R A I N I N G GU I D E
ELECTRONIC DISPLAY SYSTEM
7-70 For Training Purposes Only
Sept 04
PRIMARY FLIGHT DISPLAY (Cont)
220
200
190
180
170
160
150
LIM HDG
29.92 IN
AP1 ASEL
SPD VAPP VNAV
0.856M
CRS
360
HDG
330
1000
VS 1000
MSG 0
1
2
3
1
2
3
9500
10500
10000
VOR 1
VOR 2
ATT2
ADC1
20 20
10 10
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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