*
ARINC -Aeronautical Radio, Incorporated
*
ASG -ARINC signal gateway
*
BSCU -brake system control unit
*
CG -center of gravity
*
DB -data base
*
FMCF -flight management computing function
*
FSEU -flap/slat electronics unit
*
GPWC -ground proximity warning computer
*
GPSL -glideslope power level
*
GW -gross weight
*
HYDIM -hydraulic interface module
*
MAT -maintenance access terminal
*
MCP -mode control panel
*
MGSCU -main gear steering control unit
*
MLG -main landing gear
*
MMO -maximum operating mach number
*
MWL -master warning light
*
NCD -no computed data
EFFECTIVITY
BEJ ALL
*
NLG -nose landing gear
*
OPBC -overhead panel bus controller
*
OPC -operational program code
*
OPS -operational program system
*
PFC -primary flight computer
*
PFCS -primary flight control system
*
PFD -primary flight display
*
PLI -pitch limit indication
*
PSEU -proximity sensor electronics unit
*
PWS -predictive windshear
*
RA -radio altitude
*
RA RT -radio altimeter receiver-transmitter
*
SAARU -secondary attitude air data reference unit
*
SBLP -speedbrake lever position
*
SBPL -speedbrake power level
*
STRIP -stick shaker trip point
*
TBD -to be determined
*
TCAS -traffic alert and collision avoidance system
*
TLRA -thrust lever resolver angle
*
V1 -decision speed
*
VBFLO -initial buffet onset speed
*
VCAS -computed airspeed
*
VCMIN -active control minimum speed
*
VFE -maximum flaps extended speed
*
VLE -maximum gear extended speed
*
VMAX -maximum speed limit
*
VMIN -minimum speed limit
*
VMO -maximum operating speed
*
VSS -stick shaker speed
*
VSSNG -maneuver margin above stick shaker speed
*
WES -warning electronic system
*
WEU -warning electronic unit
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Page 1 D633W101-BEJ Jan 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
WARNING ELECTRONIC SYSTEM -INTRODUCTION
* WXR -weather radar
EFFECTIVITY BEJ ALL 31-51-00
Page 2
D633W101-BEJ Jan 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
WARNING ELECTRONIC SYSTEM -INTRODUCTION
EFFECTIVITY BEJ ALL 31-51-00
Page 3
D633W101-BEJ Jan 05/2002
WES -GENERAL DESCRIPTION
General
The warning electronic system (WES) has two warning electronic units (WEUs). Each WEU has two internal channels which do the same functions. The WES receives inputs from sensors, airframe, and avionics systems. The systems ARINC 629 buses supply most of the data. Discrete inputs supply the rest of the data.
The WES does these functions:
*
Master warning light control
*
Alert aurals control and amplification. This includes amplification of alert aurals from the traffic alert and collision avoidance system (TCAS) computer, the ground proximity warning computer (GPWC), and the predictive windshear (PWS) function of the weather radar (WXR).
*
Landing and takeoff configuration warning
*
Speedbrake alert
*
Stabilizer green band
*
Altitude alert
*
Stall warning
*
Auto slat enable
*
Speed tape parameter calculation. This includes maximum operating velocity (Vmo), and maximum operating mach (Mmo) indication.
Outputs go to these:
*
Master warning lights
*
Aural warning speakers
*
Stick shaker actuators
*
Weather radar (WXR) system
*
Airplane information management system (AIMS) for displays, maintenance functions, and data conversion.
EFFECTIVITY BEJ ALL 31-51-00
Page 4
D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
WES -GENERAL DESCRIPTION
EFFECTIVITY BEJ ALL 31-51-00
Page 5
D633W101-BEJ Jan 05/2002
WES -COMPONENT LOCATIONS 1
General
The warning electronic units (WEUs) are in the main equipment center.
The alternate gear down dispatch switch is on the right side of the lower main equipment access hatch.
EFFECTIVITY BEJ ALL 31-51-00
Page 6
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