*
AIMS -airplane information management system

*
AMU -audio management unit

*
BITE -built-in test equipment

*
CMCF -central maintenance computing function

*
CMCS -central maintenance computing system

*
FT -functional test

*
IM -inner marker

*
I/O -input/output

*
LED -light emitting diode

*
MAT -maintenance access terminal

*
MB -marker beacon

*
MM -middle marker

*
NVM -non-volatile memory

*
OM -outer marker

*
PDSF -primary display system function

*
PFD -primary flight display

*
RF -radio frequency

*
SDI -source/destination indicator

*
VOR -VHF omnidirectional ranging

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777 AIRCRAFT MAINTENANCE MANUAL

MARKER BEACON SYSTEM -INTRODUCTION

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MARKER BEACON SYSTEM -GENERAL DESCRIPTION

General
The marker beacon system has an antenna and a VOR/marker beacon (VOR/MB) receiver. The marker beacon function only operates in the left VOR/MB receiver.
Description
The marker beacon antenna receives the marker beacon signals. The signals go to the left VOR/MB receiver.
The receiver sends marker beacon data to the airplane information management system (AIMS) cabinets to show on the the primary flight displays (PFDs).
The receiver sends marker beacon audio to the audio management unit (AMU).
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MARKER BEACON SYSTEM -GENERAL DESCRIPTION

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MARKER BEACON SYSTEM -COMPONENT LOCATIONS
General
The marker beacon antenna is on the bottom of the fuselage. The left VOR/MB receiver is in the main equipment center.
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MARKER BEACON SYSTEM -COMPONENT LOCATIONS

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MARKER BEACON SYSTEM -INTERFACES

Power
The left VOR/marker beacon (VOR/MB) receiver uses 115v ac for power.
Antenna Interface
The marker beacon antenna sends radio frequency (RF) signals to the left VOR/marker beacon (VOR/MB) receiver.
Air/Ground Relay
The air/ground relay supplies an air/ground discrete signal to the left VOR/marker beacon (VOR/MB) receiver. The VOR/MB receiver uses this signal:
*
To prevent a test in the air

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To count flight legs for an internal nonvolatile fault memory.

Audio Interface
The VOR/MB receiver sends marker beacon audio to the audio management unit (AMU). The AMU supplies marker beacon audio to the flight deck.
CMCS Interface
The left AIMS cabinet sends central maintenance computing system (CMCS) data to the left VOR/MB receiver. The receiver uses this data to start a test.
Marker Beacon Output
The left VOR/MB receiver supplies marker beacon data to the left and right AIMS cabinets. The AIMS cabinets:
*
Supply marker beacon display data to the PFDs

*
Receive marker beacon fault and status data.

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777 AIRCRAFT MAINTENANCE MANUAL

MARKER BEACON SYSTEM -INTERFACES

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MARKER BEACON SYSTEM -VOR/MARKER BEACON RECEIVER

General
The VOR/marker beacon (VOR/MB) receiver has two parts:
*
VOR receiver

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Marker beacon receiver

The marker beacon system uses only the left VOR/MB receiver. The marker beacon receiver receives only 75 MHz signals.
Test and Indications
When you do a test of the left VOR/MB receiver, you do a test of the VOR function and the marker beacon function in the VOR/ MB receiver at the same time.
There is a test switch and three light emitting diodes (LEDs) on the front panel of the VOR/MB receiver.
You can also do a test from the maintenance access terminal (MAT).
Flight Fault Memory
The VOR/MB receiver has a nonvolatile flight fault memory. Only shop personnel can read the memory.
　
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