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(ADS), radio altimeter, standby instruments and aircraft clocks.
ELECTRONIC FLIGHT INSTRUMENT SYSTEM (EFIS)
The electronic flight instrument system (EFIS) takes input data from airplane radios, sensors and
control panels, and displays the information on four electronic flight displays (EFDs).
Two of the EFDs function as primary flight displays (PFDs), and two EFDs function as multifunction
displays (MFDs).
The color conventions used for the PFD and MFD symbology are:
White For all scales and on-side FMS sensor data
Green For on-side sensor data (non-FMS)
Yellow For cross-side sensor data and caution information
Magenta For pilot-selectable data
Cyan For secondary information
Red For warnings and failure flags
Electronic Flight Displays
Figure 11−10−1
Components and Operations
Primary Flight Display
The primary flight display (PFD) presents the flight instruments in a typical “T” formation, which
includes both the attitude director indicator (ADI) and the horizontal situation indicator (HSI).
The two PFDs are the outboard EFDs of the instrument panel, The PFDs come on automatically
upon receiving DC power.
FLIGHT INSTRUMENTS
Description
Vol. 2 11−10−1
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ELECTRONIC FLIGHT INSTRUMENT SYSTEM (EFIS) (CONT'D)
The following data is displayed on the PFD:
• Attitude
• Heading
• Airspeed
• Altitude
• Vertical speed
• Flight mode annunciators
• Nav source and navigation information
• HSI
Primary Flight Display (PFD)
Figure 11−10−2
Multifunction Display
The MFDs present navigation information in pilot-selectable formats.
The MFDs are the displays located inboard of the PFDs. Like the PFDs, they come on
automatically upon receiving DC power. The MFDs also provide reversionary backup displays
for the PFD or the EICAS.
FLIGHT INSTRUMENTS
Description
Vol. 2 11−10−2
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ELECTRONIC FLIGHT INSTRUMENT SYSTEM (EFIS) (CONT'D)
The following page formats may be displayed on the MFDs:
• HSI
• Nav sector map
• FMS map
• Plan map
• TCAS
Additional MFD information includes:
• Weather radar
• Terrain data (if EGPWS installed)
• Checklist (operated from the EICAS control panel)
• Reversion to PFD or EICAS
• Remote text (maintenance diagnostic computer and FMS text)
FLIGHT INSTRUMENTS
Description
Vol. 2 11−10−3
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ELECTRONIC FLIGHT INSTRUMENT SYSTEM (EFIS) (CONT'D)
Multifunction Display (MFD)
Figure 11−10−3
EFIS Comparator Monitor
Data displayed on the two PFDs is continuously compared for deviations. When defined trip levels
are exceeded, the EFIS COMP MON caution EICAS message is displayed, and the flashing
MASTER CAUTION lights are triggered.
FLIGHT INSTRUMENTS
Description
Vol. 2 11−10−4
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ELECTRONIC FLIGHT INSTRUMENT SYSTEM (EFIS) (CONT'D)
The comparator monitor has two sections; the full-time comparators and the category II
comparators.
Full-Time Comparator
Full-time comparator warning is performed for pitch, roll, heading, altitude and airspeed data.
Comparator warnings appear in yellow and flash temporarily on the PFD. They then remain
displayed while the condition exists.
NOTE
A subsequent EFIS comparator monitor indication will not cause
another Master Caution to flash. Only the comparator indication on
the PFD will flash.
Pitch
Pitch comparator monitoring is enabled if both sides are using different inertial reference system
(IRS) sources, and both sources have not failed (any ATT flag). When enabled, if the pilot’s and
copilot’s displayed pitch difference is greater than 4° when en route, or greater than 3° during
approach, the pitch comparator warning “PIT” shows on the attitude indicator.
Roll
Roll comparator monitoring is enabled if both sides are using different IRS sources, and both
sources have not failed (any ATT flag). When enabled, if the pilot’s and copilot’s roll difference is
greater than 4° when en route, or greater than 3° during approach, the comparator warning
“ROL” shows on the attitude indicator.
Heading
The heading comparator is enabled when:
　
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