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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-31-00-011
General
The navigation (NAV) control panels supply frequency control
and test signals to the DME, the MMR, and the VOR navigation
radios.
Operation
The NAV control panels have an active frequency indicator and
a standby frequency indicator. The frequency that shows in the
active frequency indicator is the frequency the navigation radios
use for operation. The standby frequency indicator shows the
next frequency you will use.
The frequency transfer switch is a momentary action switch. It
transfers the frequency in the standby frequency indicator to the
active frequency indicator. When you push the switch, the
frequency in the active frequency indicator transfers to the
standby frequency indicator.
The frequency selectors are continuous rotary selectors. There
is an inner selector and an outer selector. The outer selector
sets the tens and ones numbers. The inner selector sets the
tenth and one hundredth numbers. The frequency selectors
only change the numbers in the standby frequency indicator.
At power up, the frequency displays show the last frequency
entry before power down.
The NAV control panel continuous BITE function monitors the
operation. The NAV control panel shows FAIL in the active and
the standby frequency indicators when there is a control panel
failure.
An internal monitor in the NAV control panel monitors the 28v
dc input. If the monitor does not see the 28v dc, it shows the
message BLANK in the active and the standby frequency
indicators.
Test
When you push the NAV control panel test switch, a test
command goes out on the data bus. If a VOR frequency is
active, the VOR receiver starts a self test. If an ILS frequency is
active, the MMR receiver starts a self test. If a DME frequency is
paired with the VOR or ILS frequency, the DME interrogator
starts a self test at the same time.
When you do a test of the master dim and test system, the NAV
control panel shows 188.88. The display shows for two seconds
on, then one second off until the test is complete.
ILS - NAVIGATION CONTROL PANEL
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-31-00-012
ILS - NAVIGATION CONTROL PANEL
ILS - NAVIGATION CONTROL PANEL
EFFECTIVITY
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ILS - NAVIGATION CONTROL PANEL
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Power Interface
The NAV control panel uses 115v ac power for operation. It also
uses 28v dc for an internal monitor. The NAV control panel uses
5v ac from the master dim and test for panel lights.
ARINC 429 Interfaces
Frequency tune inputs and test commands from the NAV control
panel go to the MMR on an ARINC 429 bus.
When you tune an ILS frequency, the frequency tune circuits
operate switches in the NAV control panel that send these
discrete signals:
* Open discrete to the REU
* Ground discrete to the DEUs
* 28v dc to the FCCs
* 28v dc to the LOC antenna switches.
Discrete Interfaces
The REU uses the open discrete to select ILS audio. The DEUs
use the ground discrete to set the ILS displays. The NAV control
panel sends the 28v dc to the FCCs when an ILS frequency is
active. It also sends 28v dc to the LOC antenna switches when
an ILS frequency is active for switch operation.
The on-side FCC supplies a discrete during an AFDS approach
mode. The discrete causes the MMR to not accept any
frequency changes. The discrete also goes to the NAV control
panel. When the discrete is set, It prevents any frequency
change to the output data word that goes to the MMR. The MMR
uses the air/ground discrete for flight leg count.
RF Interfaces
RF signals from the VOR/LOC antenna or localizer antenna in
the nose radome, go to the localizer receiver circuits in the
MMR. RF signals from the glideslope antenna in the nose
radome go to the glideslope receiver circuits in the MMR.
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