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expanded displays if the VOR bearing is in the compass rose
display limit. The bearing pointers can show VOR data in the
APP, VOR, and MAP modes.
The DEUs remove the bearing pointers when the VOR bearing
from the VOR/MB receivers is NCD. The DEUs also remove the
bearing pointers when you set the VOR/ADF selector switches
on the EFIS control panels to OFF.
The NAV data source shows in green at the bottom left and right
corners of the display for bearing pointers 1 or 2. The display
also shows the frequency or identifier for the active station.
Deviation Bar and Scale
The VOR deviation bar shows in magenta. The DEUs use VOR
bearing from the VOR/MB receivers and course inputs from the
DFCS mode control panel to calculate VOR deviation.
The scale is the standard four dot scale. One dot equals five
degrees of deviation.
The DEUs remove the deviation bar for NCD deviation inputs
from the VOR/MB receivers.
Selected Course Pointer
The course select control on the DFCS mode control panel sets
the position of the selected course pointer.
TO/FROM Pointer and Indicator
The TO/FROM pointer is a small white triangle that shows as
part of the selected course pointer. The TO/FROM pointer
shows on the centered VOR display only.
The TO/FROM indicator shows at the bottom right corner of both
the centered and expanded VOR displays. The DEUs use VOR
bearing from the VOR/MB receivers and course inputs from the
DFCS MCP to calculate TO/FROM pointer and indicator
displays.
VOR SYSTEM - EFIS NORMAL DISPLAYS
EFFECTIVITY
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The TO indication shows when you enter a course on the DFCS
MCP that takes you to the VOR station. The FROM indication
shows when you enter a course that takes you away from the
VOR station.
The DEUs remove the TO/FROM pointer and indicators for NCD
and invalid displays.
NAV Data Source
The DEUs show the source of the data for the ND display in the
upper right corner. The normal source for the captain NAV
display is the VOR/MB receiver 1 and the normal source for the
first officer is the VOR/MB receiver 2.
VOR Frequency
The VOR frequency shows in the upper right next to the NAV
data source. The frequency from the NAV control panel goes
through the VOR/MB receivers, then to the DEUs for display.
The frequency shows in green. IF the VOR receiver gets a valid
station identifier from the VOR station, the station identifier
replaces the VOR frequency.
The DEUs change the VOR frequency to dashes for NCD inputs
from the VOR/MB receivers.
VOR SYSTEM - EFIS NORMAL DISPLAYS
EFFECTIVITY
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34-51-00-017
VOR SYSTEM - EFIS NORMAL DISPLAYS
VOR SYSTEM - EFIS NORMAL DISPLAYS
EFFECTIVITY
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34-51-00-017
Invalid Display
The DEUs remove these displays for invalid VOR/MB receiver
inputs:
* Deviation bar and scale
* TO/FROM pointer and indicator
* VOR frequency
* NAV data source
* Bearing pointers.
The DEUs show the amber VOR flags on both the centered and
expanded VOR displays for VOR/MB receiver failures.
VOR SYSTEM - EFIS INVALID DISPLAYS
EFFECTIVITY
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34-51-00-018
VOR SYSTEM - EFIS INVALID DISPLAYS
VOR SYSTEM - EFIS INVALID DISPLAYS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-51-00-018
Test
Push the test switch on the front panel to start a test of the VOR
receiver. The test results show on the LED status indicators.
There are two status LEDs. The LRU status LED can be red or
green. The control fail LED is only red.
When you push the test switch, the receiver does a check of the
internal receiver operation and its interface with the NAV
control panel. The test takes 48 seconds. This is the test
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