*
CDU -control display unit
*
clb -climb
*
CMCF -central maintenance computing function
*
DLGF -data load gateway function
*
EICAS -engine indication and crew alerting system
*
F/D -flight director
*
FMCF -flight management computing function
*
FMCS -flight management computing system
*
FPA -flight path angle
*
FPM -feet per minute
*
FSEU -flap/slat electronics unit
*
G/A -go-around
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AUTOPILOT FLIGHT DIRECTOR SYSTEM -INTRODUCTION
*
G/S -glideslope
*
GCU -generator control unit
*
hdg -heading
*
HYDIM -hydraulic interface module
*
LCD -liquid crystal display
*
LED -light emitting diode
*
LNAV -lateral navigation
*
loc -localizer
*
MCP -mode control panel
*
MFD -multi-function display
*
ND -navigation display
*
OPAS -overhead panel ARINC 629 system
*
PCU -power control unit
*
PFC -primary flight computer
*
PFD -primary flight display
*
PSEU -proximity sensor electronics unit
*
pth -path
*
SAARU -secondary attitude air data reference unit
*
spd -speed
*
TMCF -thrust management computing function
*
TO/GA -takeoff/go-around
*
trk -track
*
V2 -takeoff safety speed
*
V/S -vertical speed
*
VNAV -vertical navigation
*
WOW -weight-on-wheels
*
X-CH -cross channel
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AUTOPILOT FLIGHT DIRECTOR SYSTEM -INTRODUCTION
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Page 3
D633W101-BEJ Jan 05/2002
AFDS -GENERAL DESCRIPTION
Pilot Interface
The mode control panel (MCP) is the primary interface between the pilot and the autopilot flight director computers (AFDCs).
Other pilot inputs to the AFDCs are the disconnect switches and the go-around (GA) switches.
Sensors
Sensors supply the AFDCs with this information:
*
Transducer positions
*
Inertial data
*
Atmospheric data
*
Ground reference data
*
Airplane accelerations
*
Velocities
*
Attitudes.
These are the types of sensors:
*
Airplane sensors
*
Navigation sensors
*
Air data sensors (ADIRU and SAARU).
Airplane Information Management System (AIMS) Interface
The flight management computer function (FMCF) sends LNAV and VNAV data to the AFDCs.
The thrust management computer function (TMCF) sends autothrottle data to the AFDCs.
The primary display function receives AFDS display data.
Primary Flight Control System (PFCS)
The primary flight computers (PFCs) receive commands from the AFDCs. The PFCs calculate and send surface position commands to the actuator control electronics (ACE).
The ACEs receive surface position commands from the PFCs. The ACEs send commands to the surface power control units (PCU). The PCUs move the surface.
The PFCs also calculate and send backdrive commands to the AFDCs.
Backdrive Actuators
The AFDCs receive backdrive actuator commands from the PFCs. The AFDCs send backdrive commands to the backdrive actuators. The actuators cause the control wheels, control columns, and rudder pedals to move.
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777 AIRCRAFT MAINTENANCE MANUAL
AFDS -GENERAL DESCRIPTION
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D633W101-BEJ Jan 05/2002
AFDS -FLIGHT DECK COMPONENT LOCATIONS
AFDS Component Location In The Flight Deck
These are the AFDS components in the flight deck:
*
Mode control panel (MCP)
*
Takeoff/go-around (TO/GA) switches
*
Autopilot disconnect switches.
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777 AIRCRAFT MAINTENANCE MANUAL
AFDS -FLIGHT DECK COMPONENT LOCATIONS
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D633W101-BEJ Jan 05/2002
AFDS -MAIN EQUIPMENT CENTER COMPONENT LOCATION
AFDS Component Location
The AFDCs are on the E1, E2, and E4 racks in the main equipment center.
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