*
A/G -air/ground
*
AGS -air/ground system
*
AIMS -airplane information management system
*
APU -auxiliary power unit
*
ASCPC -air supply and cabin pressure controller
*
ASG -ARINC signal gateway
*
ARINC -Aeronautical Radio, Inc.
*
ATC -air traffic control
*
EEC -electronic engine control
*
ELMS -electrical load management system
*
gnd -ground
*
HF -high frequency
*
HYDIM -hydraulic interface module
*
ILS -instrument landing system
*
MAT -maintenance access terminal
*
MLG -main landing gear
*
PA/CI -passenger address/cabin interphone
*
PSEU -proximity sensor electronic unit
*
TCAS -traffic alert and collision avoidance system
*
VOR/MB -VOR/marker beacon
*
WHCU -window heat control unit
*
WOW -weight-on-wheels
*
WX -weather
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777 AIRCRAFT MAINTENANCE MANUAL
AIR/GROUND SYSTEM -INTRODUCTION
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D633W101-BEJ Jan 05/2002
AIR/GROUND SYSTEM -INTERFACES
General
Two WOW cards supply air/ground signals to other airplane systems through:
*
Left and right systems ARINC 629 buses
*
ARINC 429 buses
*
Air/ground relays in the ELMS.
The WOW cards get inputs from airplane systems through:
*
Left and right systems ARINC 629 buses
*
ARINC 429 buses
*
Hard-wire.
ARINC 629 Interfaces
These systems and components get air/ground signals through the systems ARINC 629 buses:
*
Airplane information management system (AIMS)
*
Airborne vibration monitor signal conditioner unit (AVMSCU)
(2)
*
Autopilot flight director computer (AFDC) (3)
*
Audio management unit (AMU)
*
APU controller (APUC)
*
Air supply cabin pressure controller (ASCPC) (2)
*
Backup generator converter
*
Bus power control unit (BPCU)
*
Cabin system management unit (CSMU)
*
Cabin temperature controllers (CTC) (2)
*
Control display unit (CDU) (3)
*
Engine data interface unit (EDIU) (2)
*
Electrical load management system (ELMS)
*
Fuel quantity indication system (FQIS) processor
*
Flap slat electronic unit (FSEU) (2)
*
Generator control unit (GCU) (3)
*
Overhead panel bus controller (OPBC)
*
Passenger address/cabin interphone (PA/CI) controller
*
Proximity sensor electronics unit (PSEU) (2)
*
Warning electronic unit (WEU) (2).
The AIMS uses the air/ground signals for these functions:
*
Central maintenance computing
*
Data communications management
*
Data conversion gateway
*
Flight management computing
*
Navigation display
*
Primary flight display
*
Software data loader
*
Thrust management computing function.
These systems get air/ground data through the data conversion gateway function in the AIMS:
*
Cabin telecommunications unit (CTU)
*
Flight data recorder (FDR)
*
Global positioning system (GPS)
*
Ground proximity warning system (GPWS)
*
Primary flight computer (PFC) (3).
The ELMS supplies air/ground signals for these functions:
* APU controls
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D633W101-BEJ Sep 05/2002
AIR/GROUND SYSTEM -INTERFACES
*
Cargo fire extinguishing
*
DC standby system
*
Ground crew call horn
*
Fuel jettison
*
Fuel management
*
Hydraulic pump control
*
Passenger oxygen system.
Internal Card File Systems
These cards in the left and right systems card files get air/ ground signals through ARINC 429 which go through the ASG cards:
*
Airfoil and cowl ice protection system (ACIPS) card (2)
*
Cargo smoke detection system (CSDS) card (2)
*
Environmental control system miscellaneous card (ECSMC)
(2)
*
Hydraulics interface modules (HYDIM) card (4).
The duct leak overheat detection system (DLODS) also gets air/ ground inputs through the systems card files.
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