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Indicates that the rudder limiter switching capability is lost. It may
be accompanied by an additional rudder authority caution message.
RUD AUTHORITY LOW
Indicates that the rudder authority available is low (rudder limiter failed in low authority position).
split is:
RUD LIMITER FAULT RUD AUTHORITY SAFE
At or greater than 4 degrees Indicates that one Indicates that rudder
above 250 knots, or channel of the rudder authority is safe in current limiter is inoperative. configuration and speed.
6 degrees below 250 knots.
"NO TAKE-OFF"
GF1010_032
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
PRIMARY/SECONDARY FLIGHT CONTROL EICAS MESSAGES (CONT'D)
STAB CH 1-2 FAIL
Indicates that channel 1 or 2 failed.
SPLRS/STAB BIT
Indicates that a fault has been recognized by the flight control unit (maintenance action before the next scheduled check). This message appears only on the ground.
PITCH FEEL FAULT
Indicates that either pitch feel is inoperative or degraded (force gradient not nominal) on one or both channels.
STAB CH 1-2 OFF
Indicates that the affected pitch trim off switch (centre pedestal) has been selected to the OFF position.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
SLAT/FLAP CONTROL SYSTEM
The slat and flap control system is an integrated electro-mechanical system which operates both slats and flaps from a single flight compartment control lever. The flap and slat control systems are mechanically independent. Each system is comprised of actuators, linked through a rigid driveline, to a central Power Drive Unit (PDU). Each PDU incorporates dual electric motor/brake assemblies. The slats and flaps will continue to operate at half speed with a single motor operating.
Asymmetry brakes for both flaps and slats are installed to provided driveline braking in the event of shaft failures. Dual sensors are located at the outboard-most ends of the driveline. They are used by the control units for system positioning and fault monitoring. Position sensors are located next to each flap actuator to provide position feedback to the control units.
The slats are extended first if both slat and flap extension is required. The flaps are retracted first if both slat and flap retraction is required.
Two Slat/Flap Control Units (SFCUs) control the operation of the slats and flaps. Electrically there are two independent channels for slats and two independent channels for flaps. Each SFCU controls and monitors the flaps and slats independently of the other unit. Each SFCU controls one slat PDU motor and asymmetry brake and one flap PDU motor and asymmetry brake. System control provides protection against asymmetry and uncommanded movement.
Slat/Flap System Schematic
SLAT/FLAP
CONTROL
LEVER
SLAT SYSTEM
SFCU 1 SFCU 2
FLAP SYSTEM
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