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The desired flight director, navigation source, EIU, IRU, and ADC can be
selected.
CRT Brightness Control
The brightness of each CRT can be adjusted. The outboard and inboard CRT
brightness controls are on the glareshield. The upper and lower CRT brightness
controls are on the center panel. The inner brightness control on the inboard and
lower CRT controls the weather radar returns.
If a CRT color fails, the display changes color but all indications remain
distinguishable and no information is lost.
Light sensors above the glareshield and near each CRT and CDU measure ambient
light level and adjust CRT brightness to maintain the desired illumination.
Display Selection and Control Examples
The following examples depict display selections.
Normal Display Configuration
PFD ND ND PFD
EICAS
NORM
PFD ND
LWR CRT
EICAS
PRI
NORM
INBD CRT
NORM
ND PFD
LWR CRT
NORM
EICAS
PRI
INBD CRT
EICAS
PRIMARY
EICAS
DISPLAY
SECONDARY
EICAS
DISPLAY
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
10.20.4 D6-30151-425
Flight Instruments, Displays -
System Description
CRT Failure Automatic Switching
Inboard CRT Display Switching
PFD ND PFD
EICAS
NORM
PFD ND
LWR CRT
EICAS
PRI
NORM
INBD CRT
NORM
ND PFD
LWR CRT
NORM
EICAS
PRI
INBD CRT
EICAS
PRIMARY
EICAS
DISPLAY
PFD ND PFD
EICAS
NORM
PFD ND
LWR CRT
EICAS
PRI
NORM
INBD CRT
NORM
ND PFD
LWR CRT
NORM
EICAS
PRI
INBD CRT
EICAS
SECONDARY
EICAS
DISPLAY
PRIMARY
EICAS
DISPLAY
December 01, 1999
747 Operations Manual
Flight Instruments, Displays -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 10.20.5
Lower CRT Display Switching
Standby Flight Instruments
The standby flight instruments include:
Standby Magnetic Compass
A standard liquid–damped magnetic standby compass is located on the center post
above the glareshield. A card located near the compass provides heading
correction factors.
Standby Attitude Indicator
The standby attitude indicator on the center instrument panel incorporates an
(APP) display, a bank indicator, and a pitch scale display. The main battery powers
the standby attitude indicator. The left ILS receiver provides approach
information.
Standby Airspeed Indicator
The standby airspeed indicator on the center instrument panel receives pitot
pressure from auxiliary pitot source 1 and static pressure from the alternate static
source.
Standby Altimeter
The standby altimeter on the center instrument panel receives static pressure from
the alternate static source. The pointer completes one revolution every 1,000 feet.
• standby magnetic compass
• standby attitude indicator
• standby airspeed indicator
• standby altimeter
• radio magnetic indicator
ND PFD
ND
EICAS
NORM
PFD ND
LWR CRT
EICAS
PRI
NORM
INBD CRT
PFD
NORM
ND PFD
LWR CRT
NORM
EICAS
PRI
INBD CRT
EICAS
PRIMARY
EICAS
DISPLAY
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
10.20.6 D6-30151-425
Flight Instruments, Displays -
System Description
Radio Magnetic Indicator
The radio magnetic indicator displays selected VOR and ADF bearings. The right
IRU provides heading information when the F/O’s IRS source selector is in
RIGHT. The center IRU provides heading information when center or left is
selected.
When the Heading Reference switch is in NORM, a heading flag is in view north
of 82° latitude (or north of 70°N between 80°W and 130°W) or south of 82°
latitude (or south of 60°S between 120°E and 160°E). When the switch is in
TRUE, true heading displays and selecting a VOR displays the VOR failure flag.
Clocks
The Captain’s clock provides time and date to the FMCs. If the Captain’s clock
fails, the F/O’s clock provides this information. In addition to time, the clocks
provide alternating day andmonth–year, elapsed time, and chronograph functions.
Chronograph switches on the glareshield control the clock chronograph function.
　
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