*
Left and right master warning lights
*
Captain and first officer navigation displays (NDs)
*
Left and right electronic flight instrument system (EFIS)
control panel (CP)
*
Left and right control display units (CDUs)
*
Captain and first officer primary flight displays (PFDs).
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777 AIRCRAFT MAINTENANCE MANUAL
GPWS -FLIGHT DECK COMPONENT LOCATIONS
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GPWS -MAIN EQUIPMENT CENTER COMPONENT LOCATIONS
GPWS Component Locations
These components are in the main equipment center:
*
Terrain select relays
*
Ground proximity warning computer (GPWC).
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GPWS -MAIN EQUIPMENT CENTER COMPONENT LOCATIONS
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GPWS -INTERFACE
Power
The GPWC gets 115v ac power from the GND PROX circuit breaker on the P11 overhead circuit breaker panel.
General Interface
The ground proximity warning computer (GPWC) has an interface with these:
*
Left, right, and center radio altimeter transceivers
*
Weather radar (WXR) receiver/transmitters (RTs)
*
Left and right AIMS cabinets
*
Multi-mode receivers (MMRs)
*
Warning electronic units (WEUs)
*
Landing gear panel
*
Program pins
*
TCAS computer.
Radio Altimeter System
The GPWC uses radio altitude from the three radio altimeter transceivers. If the three radio altimeter transceivers are valid, the GPWC selects the left radio altimeter transceiver if the left radio altitude is within 500 feet of the center or right radio altitudes.
If the three radio altimeter transceivers are valid and the left radio altitude is not within 500 feet of the center or right radio altitudes, the GPWC uses the center radio altimeter transceiver if its altitude is within 500 feet of the right radio altitude.
If the three radio altimeter transceivers are valid and the left, right, and center radio altitudes are different by more than 500 feet between each other, the GPWC uses the left radio altimeter transceiver.
If there are less than three valid radio altimeter transceivers, the GPWC selects one of the radio altimeter transceivers in this order:
*
Left
*
Center
*
Right.
Airplane Information Management System (AIMS)
The GPWC receives data from the left and right AIMS cabinets. The primary input is from the left AIMS cabinet. Both cabinets supply data to the GPWS on three ARINC 429 data buses. A fourth data bus from the left AIMS cabinet supplies CMCF test requests to the GPWC.
IRS data buses supply this data:
*
Latitude and longitude (from the ADIRU)
*
Magnetic track
*
Ground speed
*
True heading
*
Vertical speed
*
True track
*
Inertial vertical speed and altitude
*
Pitch and roll angle
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GPWS -INTERFACE
*
Pitch rate
*
Normal acceleration
*
Longitudinal acceleration
*
Vertical acceleration.
The general purpose (GP) data buses supply this data:
*
Computed airspeed
*
True airspeed
*
Barometric altitude
*
Baro-corrected altitude
*
Barometric altitude rate
*
Latitude and longitude (from the FMCF)
*
Magnetic track
*
Decision height
*
Electronic flight instrument system (EFIS) control panel (CP) control data
*
Control display unit (CDU) control data (alternate EFIS CP)
*
Flap and gear position
*
Indicated and corrected AOA
*
Stick shaker AOA
*
Minimum operating speed
*
Air/ground status.
The central maintenance computing (CMC) data bus supplies test commands.
The GPWC sends digital data to the AIMS cabinets on an ARINC 429 data bus. This is the data:
*
Windshear warning discrete
*
Pull up warning discrete
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*
Master warning light enable
*
Test command reply.
Global Positioning System (GPS)
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