General
The components on the flight deck that interface with the VOR system are:
*
Captain and first officer navigation displays (NDs)
*
Left and right EFIS control panels (CPs)
*
Left and right CDUs
*
Audio control panels (ACPs).
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777 AIRCRAFT MAINTENANCE MANUAL
VOR -FLIGHT DECK COMPONENT LOCATION
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VOR -ANTENNA AND MAIN EQUIPMENT CENTER COMPONENT LOCATION
General
The VOR antenna is at the top of the vertical stabilizer.
These components are in the main equipment center on the E1 and E2 racks:
*
Left and right VOR/MB receivers
*
Left and right RF power dividers
*
Left and right resistor assemblies.
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VOR -ANTENNA AND MAIN EQUIPMENT CENTER COMPONENT LOCATION
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VOR -POWER, ANALOG, AND DISCRETE INTERFACE
General
These are the components that have interface with the VOR system:
*
Circuit breakers
*
VOR antenna
*
Control display units (CDUs)
*
AFDCs
*
Air/ground relays
*
Audio management unit (AMU).
Circuit Breakers
The VOR circuit breakers supply 115v ac power for operation. The left VOR/MB receiver gets power from the ac standby bus and the right VOR/MB receiver gets power from the right ac transfer bus.
CDUs
The CDUs send a frequency source select discrete to cause the VOR receivers to select the tune input from either the CDU or the AIMS cabinets. The resistor assemblies pull up the discretes to 28v dc. The left CDU sends a ground discrete to the left VOR receiver to change the source. The right CDU sends a ground discrete to the right VOR receiver to change the source.
Air/Ground Relay
The air/ground relays supply discrete inputs to the VOR/MB receivers to do these functions:
*
Set flight legs (as alternate source, primary is from the CMCF of AIMS)
*
Inhibit test commands in the air.
VOR Antenna
The VOR antenna sends RF signals through the left and right power dividers to the VOR/MB receivers.
Audio Management Unit
The audio management unit receives Morse code station identifier signals and station audio from the VOR receivers and supplies them to the flight interphone speakers and headsets.
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VOR -POWER, ANALOG, AND DISCRETE INTERFACE
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VOR -SYSTEM INTERFACE
General
These are the components that interface with the VOR receivers:
*
Left and right control display units (CDUs)
*
Left and right airplane information management system (AIMS) cabinets.
All digital interfaces are on ARINC 429 data buses.
CDU
The left and right CDUs supply alternate tune inputs directly to the VOR receivers if the AIMS tune inputs fail. The left CDU alternate tunes the left VOR receiver and the right CDU alternate tunes the right VOR receiver.
AIMS
The left AIMS cabinet sends test commands and primary flight leg information to the left and right receivers on the Left CMC bus and right CMC bus.
The right AIMS cabinet sends manual tune and autotune inputs to the left and right VOR receivers on the left tune bus and right tune bus.
VOR Outputs
Each VOR receiver has two output buses. One output bus to the left AIMS cabinet and one output bus to the right AIMS cabinet. Output bus one and two from each receiver sends VOR data, test results, and fault information to the left and right AIMS cabinets.
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777 AIRCRAFT MAINTENANCE MANUAL
VOR -SYSTEM INTERFACE
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VOR -VOR/MB RECEIVER
General
The VOR/marker beacon (VOR/MB) receiver has two receivers:
*
VOR receiver
*
Marker beacon receiver
Test and Indications
There are two light emitting diodes (LEDs) and a test switch on the front panel of the VOR/MB receiver. The LEDs show receiver test status when you do a test of the VOR/MB receiver. The red control fail input LED shows the status of the tune inputs. The green or red LRU status LED shows the status of the receiver test.
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