NO. 2 OR 4 REVERSE THRUST LEVER ACTUATED SHAFT
D
FWD
INPUT FROM SPEED BRAKE CONTROL LEVER NO-BACK BRAKE INBD E SOLENOID LEVER LOCK SPEED BRAKE
ACTUATOR INPUT CRANK QUADRANT FORWARD
SPRING-LOADED CAM FOLLOWER
CAM DETENT
ARM SWITCH AUTO SPEED BRAKE SPEED BRAKE ACTUATOR INPUT FROM AUTOMATIC
Figure 2 (Sheet 2) Speed Brake Control System Component Location F
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A
747-400 MAINTENANCE MANUAL
SPEED BRAKE DRUM MECHANISM
SBA-1
SBB-1
SPOILER CONTROL DIFFERENTIAL MECHANISMS
SBA-1
SBB-1
SEE G
OUTPUT TO SPOILER CONTROL DIFFERENTIAL MECHANISMS
SBA-1 SPEED BRAKE
SEQUENCE
INPUT CABLES MECHANISM
FROM SPEED BRAKE DRUM SEE H GROUND SPOILER
MECHANISM CONTROL VALVE
SEE I
G
SBB-1
OUTPUT TO GROUND SPOILER CONTROL VALVE
H
Speed Brake Control System Component Location Figure 2 (Sheet 3)
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747-400
MAINTENANCE MANUAL
SEE J
SPOILERS (4) OUTBOARD FLIGHT SPOILER FLIGHT INBOARD SPOILER GROUND
INPUT FROM SPEED BRAKE SEQUENCE MECHANISM
UP 1
PORT
GROUND SPOILER
UP 2 TRAILING CONTROL PACKAGE
PORT PRESSURE EDGE BEAM
PORT
GROUND SPOILER
CONTROL VALVE THERMAL
RELIEF
RETURN VALVE
PORT
I
HYDRAULIC
LINE - UP 2
HYDRAULIC
LINE - UP 1
HYDRAULIC
LINE-RETURN
HYDRAULIC LINE-PRESSURE
EXTENSION CHECK VALVE
GROUND SPOILER
NOTE: LEFT WING GROUND SPOILER SHOWN. SWITCHING VALVE
J
RIGHT WING SIMILAR.
Speed Brake Control System Component Location Figure 2 (Sheet 4)
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MAINTENANCE MANUAL
B. A speed brake lever position transmitter (Ref 27-08-00) is linked to the speed brake drum mechanism. The transmitter provides speed brake control lever position information to the flight control computers (Ref 22-10-00) and to the flight data recorder (Ref 31-31-00).
3. Speed Brake Lever Lock (Fig. 2)
______________________
A. The speed brake lever lock prevents the speed brake control lever from being moved aft of the FLIGHT DETENT position during flight. The lever lock mechanism is located below the control stand in the speed brake lever linkage. A solenoid in the lever lock is energized when the airplane is in the air. The solenoid moves a mechanical stop into the lever linkage.
4. Speed Brake Drum Mechanism (Fig. 2)
__________________________
A. The speed brake drum mechanism is located below and aft of the control stand. The drum mechanism consists of a quadrant assembly and a no-back brake. The linkage from the speed brake control lever attaches to the quadrant through the no-back brake. The quadrant assembly moves the control cables which connect to the speed brake sequence mechanism in the left wing gear wheel well. The no-back brake prevents torque applied through the control cables from passing back to the control lever and allows the lever to have a manual override of the automatic speed brake actuator.
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