777 AIRCRAFT MAINTENANCE MANUAL
ILS -GLIDESLOPE ANTENNA INPUTS
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ILS -RECEIVER
Purpose
The multi-mode receiver (MMR) supplies localizer and glideslope deviation to the autopilot flight director computers (AFDCs) and to the AIMS cabinets for display.
Description
Each receiver is a standard ARINC 600 3 MCU unit. The receiver weighs ten pounds and uses 115v ac power for operation.
There are status LEDs on the front panel and a receiver test switch. The ILS status LEDs show either green for a test pass, or red for a test fail.
The receiver has a nonvolatile flight fault memory. Use the ATE connector at the rear of the ILS receiver to access the fault memory. Only shop personnel can use this feature.
Front Panel LEDs
The receiver front panel has these LEDs:
*
LRU STATUS -red shows for an internal receiver failure
*
CONTROL FAIL -red shows for a control failure
*
ANT FAIL -not connected.
Training Information Point
The maintenance manual and the fault isolation manual do not have a task for the line maintenance technician to do a test from the front panel of the receiver. You must do all tests for the receiver from the MAT or a PMAT.
Many LRUs on the 777 are compatible with other model airplanes that do not have a central maintenance computing system (CMCS). For that reason those LRUs have a front panel test feature.
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777 AIRCRAFT MAINTENANCE MANUAL
ILS -RECEIVER
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ILS -LOCALIZER AND GLIDESLOPE ANTENNAS
Localizer Antennas
There are two localizer antennas. Each antenna has two elements. The localizer antennas receive frequencies from
108.1 MHz to 111.95 MHz at odd tenths intervals.
The antennas supply signal reception within 90 degrees to the left or right of the airplane centerline.
Glideslope Capture Antennas
There are two glideslope antennas. Each antenna has two elements. The glideslope antennas receive frequencies from
328.6 MHz to 335.4 MHz. The glideslope frequencies are paired with localizer frequencies.
The antennas supply signal reception within 90 degrees above or below the airplane centerline.
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777 AIRCRAFT MAINTENANCE MANUAL
ILS -LOCALIZER AND GLIDESLOPE ANTENNAS
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ILS -GLIDESLOPE TRACK ANTENNA
General
The glideslope track antennas supply final approach and landing glideslope signals. The track antennas are in a position to minimize the vertical distance between the antenna flight path and the main landing gear.
Description
The antennas receive in the frequency range of 328.6 MHz to
335.4 MHz. The glideslope track antennas are on the left and right aft nose gear doors.
Each antenna is a dual element antenna. The left glideslope track antenna on the left aft nose gear door supplies glideslope signals to the left and center ILS receiver. The right glideslope track antenna on the right aft nose gear door supplies glideslope signals to the right ILS antenna.
The graphic below shows the left and center glideslope antenna. The right glideslope antenna looks the same.
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777 AIRCRAFT MAINTENANCE MANUAL
ILS -GLIDESLOPE TRACK ANTENNA
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ILS -FUNCTIONAL DESCRIPTION
General
The multi-mode receiver (MMR) gets tune inputs to tune the localizer and glideslope receivers. These receivers inside the MMR provide localizer and glideslope deviations to other systems.
CDU and AIMS Inputs
Manual or autotune inputs from the AIMS cabinets, or alternate tune inputs from the CDUs go through the input port switch then to the processor. The processor sends them to the synthesizers to tune the glideslope and localizer receivers.
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