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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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CAS -calibrated airspeed
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CMCS -central maintenance computing system
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CPU -central processing unit
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EHSV -electrohydraulic servo valve
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EICAS -engine indication and crew alerting system
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AILERON AND FLAPERON CONTROL -INTRODUCTION
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FCDC -flight controls direct current * Vmo -maximum operating limit speed
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FMCS -flight management computing system * WEU -warning electronic unit
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FSEU -flap/slat electronics unit * WOW -weight-on-wheels
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HLCS -high lift control system
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LAM -landing attitude modification
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LIB -left inboard
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LOB -left outboard
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LRU -line replaceable unit
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LVDT -linear variable differential transformer
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MCP -mode control panel
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MEC -main equipment center
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Mdive -maximum design dive Mach number
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MFD -multi-function display
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Mmo -maximum operating Mach number
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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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PFD -primary flight display
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PMG -permanent magnet generator
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PSA -power supply assembly
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PSAS -pitch stability augmentation system
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PSEU -proximity sensor electronics 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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TED -trailing edge down
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TEU -trailing edge up
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Vdive -maximum design dive speed
EFFECTIVITY BEJ ALL 27-11-00
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D633W101-BEJ Jan 05/2002
AILERON AND FLAPERON CONTROL -INTRODUCTION
EFFECTIVITY BEJ ALL 27-11-00
Page 3
D633W101-BEJ Jan 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
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Page 4 D633W101-BEJ Jan 05/2002
AILERON AND FLAPERON CONTROL -GENERAL DESCRIPTION
General
The pilots manually command the ailerons and flaperons; the autopilot automatically commands them.
Manual Operation -Control Wheels
The flight crew uses two conventional control wheels to control roll. A wheel jam breakout mechanism supplies a mechanical link between the control wheels. If a control wheel jams, the other continues to control.
Six position transducers change the flight crew commands of the control wheel to analog electrical signals. These signals go to the four actuator control electronics (ACEs). The ACEs change the signals to digital format and send them to the three primary flight computers (PFCs) through the flight controls ARINC 629 buses.
The PFCs use the control wheel position data, along with data from the ADIRU and AIMS, to calculate control surface commands. The PFCs send the digital commands to the ACEs, which change them to analog signals. The ACEs send the analog position commands to the power control units (PCUs) which move the control surfaces. The position transducers on the actuator pistons supply position feedback to the ACEs.
Manual Operation -Aileron Trim
The aileron trim switches and the trim actuator permit the flight crew to trim out unwanted control wheel forces. When the pilots move the aileron trim switches on the aisle stand, the switches send a signal to the aileron trim actuator. The trim actuator moves the control wheels and the position transducers through the feel and centering mechanism. This changes the neutral position of the control wheels. The transducers send a signal to the ACEs and PFCs to move the ailerons and flaperons.
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