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VOR SYSTEM - NAVIGATION CONTROL PANEL
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D633A101-SHZ1 Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The receiver contains VOR and marker beacon functions. This
section only covers the VOR function.
Operation
Frequency tune inputs from the NAV control panel go to an
ARINC 429 receiver in the VOR/MB receiver, then to the
processor. The processor sends the tune inputs to the
frequency synthesizer to tune the receiver circuits.
The control panel sends a discrete to the REU when you tune a
VOR frequency. The REU uses the discrete to select VOR audio
inputs.
When you tune a VOR frequency, the control panel also sends a
discrete to the DEUs. The DEUs use the discrete to display VOR
or ILS as the frequency data source on the lower left corner of
the captain and first officer NAV displays.
The processor sends fault data to the memory card. Only shop
personnel can read the memory card contents.
The air/ground discrete input from the PSEU inhibits a VOR test
when the airplane is in the air. The receiver also uses the
discrete for flight leg count.
RF input signals from the VOR/ILS antenna go through the
power divider then to the receiver circuits in the VOR/MB
receiver. The receiver circuits send audio and morse code
station identifier signals from the ground station to the audio
processor.
The audio processor sends the audio and morse code station
identifier signal to the audio output circuits then to the remote
electronics unit.
The morse decoder circuit decodes the station identifier and
puts it in digital format then sends it to the ARINC 429
transmitter. The display electronic units (DEU 1 & 2), use the
data to show the station identifier.
The VOR/MB VOR receiver circuits send the antenna inputs to
the bearing processor which calculates the VOR station
bearing. Data from the bearing processor goes to the ARINC
429 transmitter. The VOR/MB receiver transmits VOR bearing
and receiver status on two output buses.
Output bus 1 goes to the onside FCC. Output bus 2 goes to these
components:
* Flight data acquisition unit (FDAU)
* Radio magnetic indicator (RMI)
* Flight management computers (FMC)
* Display electronic units (DEU).
VOR SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Test
When you push the test switch on the NAV control panel, a test
command goes to the receiver when a VOR frequency is the
active frequency. When the processor receives a test command,
it monitors the VOR/MB receiver operation and control input
status. Test results show on the status LEDs when you do a test
from the front panel switches.
VOR SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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VOR SYSTEM - FUNCTIONAL DESCRIPTION
VOR SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Frequency Transfer Switch
The frequency transfer switch on the NAV control panel
transfers the frequency in the standby window display, to the
active window display.
The transfer switch also provides a discrete to the FCCs. The
FCCs use the discrete to disengage the autopilot when the
autopilot system is in the VOR mode and the crew changes the
VOR frequency.
Instrument Switching Module
The instrument switching module on the P5 overhead panel
provides discretes to the display electronics unit (DEU) for
display switching when you move the switch to the both on 1 or
both on 2 position.
With the switch in the both on 1 position, the DEU’s use VOR
data from VOR/MB receiver 1 for display. With the switch in the
both on 2 position the DEU’s use VOR data from VOR/MB
receiver 2 for display.
The instrument switching module also sends discretes to the
FCC when you move the switch out of the normal position.
VOR SYSTEM - FREQUENCY TRANSFER AND INSTRUMENT SWITCHING
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