*
Localizer deviation indication and scale
*
Glideslope deviation pointer and scale
*
Course pointer.
Localizer Deviation
When the localizer deviation is invalid, the localizer deviation bar and scale go out of view. The LOC flag shows when all ILS receivers fail.
Glideslope Deviation
When the glideslope deviation is invalid, the glideslope deviation pointer and scale go out of view. The G/S flag shows when all ILS receivers fail.
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ILS -ND ILS INVALID DISPLAY
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ILS -PFD AND ND ILS TEST DISPLAYS
General
Use the maintenance access terminal (MAT) to do a test of the multi-mode receivers (MMRs). The MAT sends the test command to the left AIMS cabinet. The central maintenance computer function of the left AIMS cabinet sends the command to the MMR.
Test Sequence
The receivers start their test sequence when the test command comes from the AIMS cabinet. This is the sequence:
*
Invalid data for the first three seconds
*
NCD data for approximately two seconds
*
Valid data -glideslope pointer up one dot, localizer pointer left one dot for 3 seconds
*
Valid data -glideslope pointer down one dot, localizer pointer right one dot for 3 seconds
*
Back to pretest displays.
The AIMS cabinets change the ILS display source when a receiver goes invalid. For this reason, the LOC and G/S flags do not show while the receiver test sequence goes invalid. To see the flags in the test sequence, the receivers that are not in test must be in a failed condition or power removed.
When the test sequence goes NCD, the localizer pointers and glideslope pointers go out of view.
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ILS -FRONT PANEL TEST
Description
Push the test switch on the front of the receiver to start a test of the receiver.
The receiver does a lamp test for the first three seconds then goes to an NCD condition for the next three seconds.
The receiver then does a check of the internal receiver circuits. Test results show on the status LEDs.
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 multi-mode receiver (MMR). You must do all tests for the MMR 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, these LRUs have a front panel test feature.
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ILS -GROUND TEST
General
You can do a test of the ILS system from the MAT. These are the tests that are available from the operational test selection on the MAT:
*
Center instrument landing system
*
Left instrument landing system
*
Right instrument landing system.
Operational Test
The operational test make sure that the instrument landing system is serviceable.
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
MARKER BEACON SYSTEM -INTRODUCTION
Purpose
The marker beacon system supplies visual and aural indications when the airplane flies over marker beacon transmitters.
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