During roll control, the spoilers on one wing move up and the spoilers on the other wing stay down.
The pilots manually control roll with the rotation of the control wheels. When engaged, the autopilot automatically commands the spoilers. During autopilot operation, the backdrive actuators backdrive the control wheels.
In roll control, all spoilers except for 4 and 11, are fly-by-wire. Spoilers 4 and 11 receive mechanical signals for roll control.
EFFECTIVITY
BEJ ALL
Spoiler Lockout
Symmetrical spoiler pairs fair and lock out if one actuator in the pair fails. Spoilers 5 and 10 fair and lock out as a function of altitude and airspeed.
Speedbrake Control
During speedbrake control, the spoilers on both wings move symmetrically.
The pilots manually command speed brake control with a conventional speedbrake lever on the aisle stand. The autopilot does not control the speedbrake function.
In speedbrake control, all spoilers are fly-by-wire, including spoilers 4 and 11.
Auto Speedbrake Control
The auto speedbrake system supplies automatic extension or retraction of the speedbrakes during landings and refused takeoffs.
To arm the system, the pilots must either place the speedbrake lever in the armed position or command reverse thrust.
See the auto speedbrake control section for more information (SECTION 27-62).
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SPOILER AND SPEEDBRAKE CONTROL -INTRODUCTION
Abbreviations and Acronyms
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ACE -actuator control electronics
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ADIRS -air data inertial reference system
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ADIRU -air data inertial reference unit
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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 -computed airspeed
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CMCS -central maintenance computing system
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EHSV -electrohydraulic servo valve
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EICAS -engine indication and crew alerting system
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FMCS -flight management computer system
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FSEU -flap/slat electronics unit
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IB -inboard
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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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MFD -multi-function display
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OB -outboard
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PCU -power control 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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RBL -right buttock line
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RIB -right inboard
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ROB -right outboard
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RTO -refused takeoff
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RVDT -rotary variable differential transformer
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SOV -shutoff valve
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TEU -trailing edge up
EFFECTIVITY BEJ ALL 27-61-00
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SPOILER AND SPEEDBRAKE CONTROL -INTRODUCTION
EFFECTIVITY BEJ ALL 27-61-00
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777 AIRCRAFT MAINTENANCE MANUAL
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SPOILER AND SPEEDBRAKE CONTROL -GENERAL DESCRIPTION
General
In roll control, the pilots manually command the spoilers and the autopilot automatically commands them. In speedbrake control, the pilots manually command the spoilers.
Roll Control -Manual Operation
The flight crew uses two conventional control wheels to control roll. All spoilers, except 4 and 11, have an electrical command path. Spoilers 4 and 11 have a mechanical command path in roll control.
Electrical Command Path
Six wheel position transducers change the flight crew control wheel commands 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, 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 spoilers. The position transducers on the actuator pistons supply position feedback to the ACEs.
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