Third symbol generator act as a standby unit and may supply either of the pilot’s displays in case of failure.
Each symbol generator receives inputs from all navigational sources, both internal and external, and interfaces between these inputs and the display screens to present the information in a standard format. In addition, the symbol generators perform the monitoring and control functions of the EFIS.
NBAA 2003
Civil Aviation Flight University of China 9
Electronic Flight Instrument Systems (EFIS)
NBAA 2003
The EFIS comprises two identical systems supplying the captain and first officer with navigational information on two display screens.
◆ Electronic Attitude and Direction Indicator (EADI) ◆ Electronic Horizontal Situation Indicator (EHSI)
Each pilot’s display has its own control panel, and a symbol generator.
EADI
EASymbol Generator
Center Symbol Generator
Right Symbol Generator
Data
Tusses
TMC (ctr) IRS FCC
Figure 2.1
(Left) VOR DME ILS RAD ALT WXR RADAR IRS FCC FMCS
二、分类
Electronic Instrument Systems (EIS)
NBAA 2003
Electronic Instrument Systems 电子仪表系统
Civil Aviation Flight University of China 6
Electronic Instrument Systems (EIS)
ON
Weather Radar Display Button
BRT MAP
WXR
ON ON ON ON ON
Electronic Flight Instrument Systems (EFIS)
NBAA 2003
EFIS Control Panel
Decision Height Reference Indicator
ADI DH REF
Decision Height Setting Knob
Decision Height
Civil Aviation Flight University of China10
Electronic Flight Instrument Systems (EFIS)
Left Light Sensor
Right Light Sensor
NBAA 2003
Left Control Panel
Right Control Panel
NBAA 2003
The principal electronic display systems in use are the Electronic Flight Instrument System (EFIS) for the presentation and control of navigational information and, for presentation of engines and systems information, either the Engine Indicating and Crew Alerting System (EICAS) or Electronic Centralized Aircraft Monitoring (ECAM). EICAS is generally used in aircraft of American manufacture and ECAM in Airbus Industries aircraft.
Civil Aviation Flight University of China 7
Electronic Instrument Systems (EIS)
NBAA 2003
Civil Aviation Flight University of China 8
Electronic Instrument Systems (EIS)
(l&r) (ctr) TMC VOR IRS DME FCC WXR FMCS IRS ILS FCC RAD ALT
(right)
FMCS
TMC (ctr) (Right) IRS VOR FCC DME ILS RAD ALT WXR RADAR IRS FCC FMCS
Civil Aviation Flight University of China11
Reset Button
RST
EADI Brightness Control Knob
BRT
Figure 2.2
EHSI Range Setting Knob
80 100 320 40 20 10
RANGE
HSI
EXP
VOR ILS
MAP
CTR
NAV
MAP
VOR
PLAN
ILS
FULL
NAV
EHSI Manual Brightness Control