SPOILER AND SPEEDBRAKE CONTROL -FUNCTIONAL DESCRIPTION -SECONDARY MODE
General
In secondary mode operation of the PFCS, the PFCs calculate roll and speedbrake control commands for the electrically-controlled spoilers based on this data:
*
Secondary roll spoiler schedule
*
Secondary speedbrake spoiler schedule
*
Spoiler lockout.
The PFCs do not control spoilers 4 and 11 in the secondary mode. These spoilers only receive roll commands from the cable-controlled system.
Secondary Roll Spoiler Schedule
The PFCs receive roll control command signals from the wheel position transducers. The secondary roll spoiler schedule determines the spoiler roll commands for all spoilers except 4 and 11. This schedule supplies a fixed, nonlinear relationship between the control wheel command and the spoiler commands. The PFCs invert the commands for the left wing in relation to the commands for the right wing.
During roll control in flight and on the ground, the PFCs command the inboard spoilers to a maximum of 20 degrees and the outboard spoilers to a maximum of 45 degrees, except spoilers 5 and 10. Spoilers 5 and 10 do not operate for roll control in secondary mode.
The cable-controlled system and linkages supply fixed, roll schedules for spoilers 4 and 11.
Secondary Speedbrake Spoiler Schedule
The PFCs receive speedbrake command signals from the speedbrake lever position transducer. The secondary speedbrake spoiler schedule determines the spoiler speedbrake commands for all spoilers except 4, 5, 10, and 11.
During speedbrake control in flight and on the ground, the PFCs command the inboard spoilers to a maximum of 20 degrees and the outboard spoilers to a maximum of 45 degrees, except for spoilers 4, 5, 10, and 11. Spoilers 4, 5, 10, and 11 do not operate as speedbrakes in secondary mode.
Combined Spoiler Commands
The PFCs combine the speedbrake and roll commands to calculate the inboard and outboard spoiler commands for the electrically-controlled spoilers.
Spoiler Lockout
Spoilers 5 and 10 are locked out at all times during roll and speedbrake commands in secondary mode of the PFCS.
EFFECTIVITY BEJ ALL 27-61-00
Page 50
D633W101-BEJ Sep 05/2002
SPOILER AND SPEEDBRAKE CONTROL -FUNCTIONAL DESCRIPTION -SECONDARY MODE
EFFECTIVITY BEJ ALL 27-61-00
Page 51
D633W101-BEJ Sep 05/2002
SPOILER AND SPEEDBRAKE CONTROL -FUNCTIONAL DESCRIPTION -DIRECT MODE
General
In the direct mode operation of the PFCS, the ACEs calculate roll and speedbrake commands for the electrically-controlled spoilers based on these inputs:
*
Direct roll spoiler schedules
*
Direct speedbrake spoiler schedules
*
Spoiler lockout.
The ACEs do not control spoilers 4 and 11 in the direct mode. These spoilers only receive roll commands from the cable-controlled system.
Direct Roll Spoiler Schedules
The ACEs receive roll command signals from the wheel position transducers. The ACEs use the direct roll spoiler schedules to calculate the roll commands for the inboard and outboard spoiler PCUs. These schedules supply a fixed nonlinear relationship between the control wheel command and the spoiler command. The ACEs invert the commands for the left wing in relation to the commands for the right wing.
In roll control in flight and on the ground, the ACEs command the inboard spoilers to a maximum of 20 degrees and the outboard spoilers to a maximum of 45 degrees.
The mechanical cable system and linkages supply fixed roll schedules for spoilers 4 and 11.
Direct Speedbrake Spoiler Schedules
The ACEs receive speedbrake command signals from the speedbrake lever transducer. The ACEs use the direct speedbrake spoiler schedules to determine the speedbrake commands for the inboard and outboard spoilers excepts 4, 5, 10 and 11. These schedules supply a fixed nonlinear relationship between the speedbrake lever command and the spoiler command.
In speedbrake control in flight and on the ground, the ACEs command the inboard spoilers to a maximum of 20 degrees and the outboard spoilers to a maximum of 45 degrees except for spoilers 4, 5, 10 and 11. Spoilers 4 and 11 do not operate as speedbrakes in direct mode.
Combined Spoiler Commands
The ACEs combine the speedbrake and the roll commands to calculate the inboard and outboard spoiler commands for the electrically-controlled spoilers.
Spoiler Lockout
Spoilers 5 and 10 are locked out at all times during roll and speedbrake commands in direct mode of the PFCS.
EFFECTIVITY BEJ ALL 27-61-00
Page 52
D633W101-BEJ Sep 05/2002
SPOILER AND SPEEDBRAKE CONTROL -FUNCTIONAL DESCRIPTION -DIRECT MODE
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