CHAPTER
27
Flight Controls
27-CONTENTS
Page 17
D633W101-BEJ
Jan 05/2002
FLIGHT CONTROLS -INTRODUCTION
General
The flight controls keep the airplane at the desired attitude during flight. They consist of movable surfaces on the wing and the empennage. The flight controls change the lift of the wing and the empennage.
There are two types of flight controls: the primary flight control system and the high lift control system.
Primary Flight Control System
The primary flight control system (PFCS) uses a fly-by-wire control system with digital and analog electronic equipment. It receives commands from the flight crew and the autopilot and causes the control surfaces to move.
The PFCS controls the attitude of the airplane during flight. The control surfaces operated by the PFCS are:
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One aileron on each wing
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One flaperon on each wing
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Seven spoilers on each wing
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One horizontal stabilizer
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One elevator on each side of the horizontal stabilizer
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One tabbed rudder.
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High Lift Control System
The high lift control system (HLCS) uses a fly-by-wire control system with digital electronic equipment. It receives commands from the flight crew and causes the flaps and slats to move.
Operation of the HLCS increases the wing lift so the airplane can takeoff and land at lower speed and higher weight. The high lift devices operated by the HLCS are:
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Seven leading edge slats on each wing
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One Krueger flap on each wing
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One single slotted outboard flap on each wing
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One double slotted inboard flap on each wing.
Operation of the HLCS also causes the ailerons and the flaperons to move. They droop on both wings when the high lift devices extend.
Benefits of the Fly-By-Wire System
The fly-by-wire design of the flight controls permits:
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A more efficient structure design
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Increased fuel economy
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A smaller vertical fin
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A smaller horizontal stabilizer
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Reduced weight
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Improved controls and protections.
Abbreviations and Acronyms
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Page 1 D633W101-BEJ Sep 05/2002
FLIGHT CONTROLS -INTRODUCTION
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ACE -actuator control electronics
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ACMS -airplane condition monitoring system
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ADIRS -air data inertial reference system
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ADIRU -air data inertial reference unit
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ADM -air data module
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AFDC -autopilot flight director computer
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AFDS -autopilot flight director system
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AIMS -airplane information management system
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ARINC -Aeronautical Radio, Inc.
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BAP -bank angle protection
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B/D -backdrive
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CMCS -central maintenance computing system
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CPU -central processing unit
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EDIU -engine data interface unit
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EHS -electrohydraulic servo valve
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EICAS -engine indication and crew alerting system
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FCDC -flight controls direct current
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FMCS -flight management computer system
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FSEU -flap/slat electronics unit
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HLCS -high lift control system
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LIB -left inboard
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LOB -left outboard
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LVDT -linear variable differential transformer
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MCP -mode control panel
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MFD -multi functional display
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PCU -power control unit
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PDU -power drive unit
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PFC -primary flight computer
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PFCS -primary flight control system
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PMG -permanent magnet generator
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PSA -power supply assembly
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PSEU -proximity sensor electronic unit
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RIB -right inboard
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ROB -right outboard
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RVDT -rotary variable differential transformer
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SAARU -secondary attitude air data reference unit
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SOL -solenoid
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SOV -shutoff valve
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STCM -stabilizer trim control module
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TAC -thrust asymmetry compensation
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WEU -warning electronic unit
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WOW -weight on wheels
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777 AIRCRAFT MAINTENANCE MANUAL
FLIGHT CONTROLS -INTRODUCTION
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Page 3
D633W101-BEJ Jan 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
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