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The localizer antenna RF inputs go directly to the LOC ANT
switches. The antenna switches select the VOR/LOC antenna or
localizer antenna as the source of the localizer RF signal input
to the MMRs.
The glideslope antenna inputs do not go through the antenna
switches. Glideslope antenna RF inputs go directly to the
MMRs.
When you tune an ILS frequency on the navigation (NAV) control
panels, they send 28v dc to the LOC antenna switches. The LOC
ANT switches use 28v dc from the NAV control panels and a
discrete signal from the integrated flight system accessory unit
(IFSAU) for operation.
The IFSAU sends the discrete when it receives a discrete from
the Flight Control Computers (FCCs). The FCCs send the
discrete when you select the approach (APP) or localizer (LOC)
mode on the DFCS mode control panel.
ILS - ANTENNA INTERFACE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ILS - ANTENNA INTERFACE
ILS - ANTENNA INTERFACE
EFFECTIVITY
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General
When you tune an ILS frequency on the NAV control panels,
discrete signals go to the DEUs to tell if the frequency is an ILS
or VOR frequency. Each NAV control panel sends the discrete
signal to the DEU 1 and DEU 2.
The FCCs send an ILS tune inhibit to the ILS function of the
MMRs during the approach (APP) mode of operation. The ILS
receiver will not accept another tune frequency during this
mode.
The PSEU sends air/ground discrete signals to the MMRs to set
the flight leg count in the internal memory, and also inhibit test
in the air.
The MMRs send ILS ground station audio to the REU. The REU
sends the audio to the flight compartment.
ILS - ANALOG INTERFACES
EFFECTIVITY
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ILS - ANALOG INTERFACES
ILS - ANALOG INTERFACES
EFFECTIVITY
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Purpose
The multi-mode receiver contains an ILS receiver and a global
positioning system (GPS) sensor unit. The ILS receiver function
supplies localizer and glideslope deviation to different airplane
systems. The GPS sensor unit supplies position data and time
to the flight management computer system (FMCS).
Description
The MMR is a standard ARINC 600 3 MCU unit with dimensions
3.75 x 7.75 x 14.6 inches. The receiver weighs 10 pounds and
uses 115v ac 400 Hz power for operation.
Test and Indication
There are status LED indicators and a test switch on the front of
the multi mode receiver. The test switch starts a functional test
of the receiver. The LED status indicators show test results.
ILS - RECEIVER
EFFECTIVITY
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34-31-00-010
ILS - RECEIVER
ILS - RECEIVER
EFFECTIVITY
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Localizer Antenna
The localizer antenna has two elements. One element supplies
RF inputs to ILS receiver 1 and one element supplies RF inputs
to ILS receiver 2. The localizer antenna receives frequencies
from 108.1 Mhz to 111.95 Mhz at odd tenth intervals.
Glideslope Antenna
The glideslope antenna also has two elements. One element
supplies RF signal inputs to MMR 1 and one element supplies
RF signal inputs to MMR 2. The glideslope antenna receives
frequencies from 328.6 Mhz to 335.4 Mhz.
ILS - ANTENNAS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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34-31-00-011
ILS - ANTENNAS
ILS - ANTENNAS
EFFECTIVITY
　
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