777 AIRCRAFT MAINTENANCE MANUAL
GPS -FUNCTIONAL DESCRIPTION
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GPS -DISPLAYS -1
General
The flight management computing function (FMCF) of the AIMS shows position initialization and position reference pages on the control display unit (CDU).
The multi-mode receivers (MMRs) send GPS data to the AIMS cabinets. GPS data shows on the CDU. The position initialization page shows the GPS position and GPS time.
The flight crew can use the GPS position to initialize the air data inertial reference unit (ADIRU) position.
The GPS universal time (coordinated) (UTC) shows on the CDU when the GPS time is valid.
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777 AIRCRAFT MAINTENANCE MANUAL
GPS -DISPLAYS -1
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GPS -DISPLAYS -2
General
Position reference page two shows the active flight management computing function (FMCF) airplane position.
The FMCF can use GPS position data to calculate the airplane position. The FMCF also uses these other navigation aids to calculate the airplane position:
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Air data inertial reference unit (ADIRU)
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Distance measuring equipment (DME)
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Very high frequency omnidirectional ranging (VOR)
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Localizer (LOC).
The FMCF calculates the accuracy of the data from each navigation aid. These calculations show as ACTUAL next to each navigation aid on POS REF page 2 of 3. Accuracy shows in nautical miles.
Use line select keys (LSK) 2R-4R to make the active FMCF use the selected data to update the FMCF position.
The left FMCF uses the left multi-mode receiver (MMR), and the right FMCF uses the right MMR. If the onside MMR fails, the FMCFs use the offside MMR.
Use line select key 6R to see the position reference in bearing/ distance format or in latitude/longitude format.
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777 AIRCRAFT MAINTENANCE MANUAL
GPS -DISPLAYS -2
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GPS -DISPLAYS -3
General
Position reference page three shows this information:
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GPS position
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Bearing and distance to the FMCF airplane position from the GPS position.
GPS Data Elimination
You can remove GPS data from the FMCF position calculation:
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Select line select key (LSK) 5R when ON shows in larger letters to remove GPS data from the FMCF calculation
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Select LSK 5R when OFF shows in larger letters to let the FMCF use GPS data.
Push LSK 6R to see the FMCF airplane position as bearing/ distance or latitude/longitude.
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777 AIRCRAFT MAINTENANCE MANUAL
GPS -DISPLAYS -3
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GPS -GROUND TEST
General
There are only system tests available for the GPS. These are the system tests available:
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Left global positioning system
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Right global positioning system.
System Test
This test lets you verify the operation of the GPS function of the multi-mode receivers (MMRs).
Training Information Point
The MMRs report their operational status to the central maintenance computing system (CMCS) at all times during operation after power-up. The MMRs do not do any additional test when you do a test from the maintenance access terminal (MAT).
During power-up, the MRRs do a test of the antennas. At that time, the MRRs verify continuity on the antenna connections. The MRRs do not do a test of the antennas during operation after power-up.
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777 AIRCRAFT MAINTENANCE MANUAL
GPS -GROUND TEST
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FLIGHT MANAGEMENT COMPUTING SYSTEM -INTRODUCTION
General
The purpose of the FMCS is to supply these functions:
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Flight plan control data
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Navigation calculations
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Display information.
The flight crew can use the FMCS data to manually or automatically fly the airplane.
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