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COMBINATION ROLL ASSIST AND PROPORTIONAL LIFT DUMPING . MFS control mixes the roll command and proportional lift dumping command. To command a handwheel command and a FSCL command, spoiler deployment of one wing decreases and increases on the other. The roll effect is obtained by the differential deployment of left and right spoilers.
For roll assist and proportional lift dumping, the spoiler scheduling depends on handwheel roll sensors and FSCL sensors. Corrections to the scheduling is a function of the airplane airspeed provided by the three air data computers and flap position under control of the SFCUs.
SPLRS/STAB IN TEST
An advisory message “SPLRS/STAB IN TEST”will be displayed when the spoilers and stab trim systems are performing self-test when hydraulics are first applied. The spoiler system is inoperative throughout the duration (approximately 20 seconds) of the test.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
ROLL SPOILER PRIORITY
The “ROLL SPLRS”priority switches are located on the glareshield at each pilot position. They are released/pressed switches with a split legend, an amber “ROLL SEL”and a white “PLT ROLL” (“CPLT ROLL”). During normal operation, the switches are not selected and remain dark. The MFSs receive roll commands from the FCUs through sensor inputs from movement of each control column. The roll commands are averaged from the sensor inputs to the FCUs for MFS operation, with the disconnect system in the normal configuration.
JAMMED AILERON CIRCUIT
In the event of a jammed aileron system, the pilots free the non-jammed system by forcing the disconnect mechanism. If no ROLL SPLRS switch selection is made within 30 seconds following disconnect, the roll disconnect switch sends a signal to the FCUs which command both “ROLL SEL” captions and a “ROLL SELECT”message to appear. Both “ROLL SEL”captions illuminate to indicate to the pilot that a priority is required by switch selection, for MFS operation due to disconnect. The 30 second time delay for illumination of the “ROLL SEL”captions is to avoid increasing pilot workload in the instant following an aileron system failure.
Selecting the appropriate priority switch prior to or following a “ROLL SEL”indication, commands the valid side to be used by the FCUs. Example above: if pilot side is selected, both pilot and copilot “ROLL SEL”captions extinguish and the “PLT ROLL”caption illuminates and vice versa for a copilot action. Until one side is selected, the FCUs continue to average pilot and copilot roll commands. After switch selection, both FCUs will use the corresponding roll input (unjammed side). This will enable the MFS to operate through their full range of operation with a single control column input.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
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