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 B.  When the airplane is airborne, the right main gear shock strut is extended and the push-pull cable closes the ground spoiler interlock valve. The valve blocks pressure from the ground spoiler control valve causing the ground spoilers to remain faired. The speed brake lever may be rotated aft to the FLIGHT detent. This is the maximum inflight speed brake setting. A double-acting lever brake in the speed brake drum mechanism retains the lever at the selected setting between DOWN and the FLIGHT detent. With the speed brakes in use, rotation of the aileron control wheels will cause further operation of the flight spoilers. Rotating the control wheels will lower the flight spoilers on the wing going up and raise the flight spoilers on the wing going down. As speed brakes are applied, the ratio changer reduces the amount of roll control input to the spoiler mixer for a given control wheel position. This reduces the angular change in spoiler position for a given roll control input.
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A
737-300/400/500MAINTENANCE MANUAL
 C.  When the airplane is on the ground, the right main gear shock strut is compressed and the push-pull cable opens the ground spoiler interlock valve. The valve then connects the ground spoiler control valve to the up side of the ground spoiler actuators. When the speed brake control lever is rotated approximately 29 degrees aft from the DOWN position, the speed brake control valve directs hydraulic pressure through the interlock valve to cause all the ground spoilers to extend 60 degrees. On the ground, the speed brake lever may be rotated aft to the UP position. In this configuration, all the ground spoilers will be raised 60 degrees and all the flight spoilers will be raised 40 degrees.
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A

737-300/400/500MAINTENANCE MANUAL
GROUND SPOILER CONTROL VALVE
SEE A
A
SEE B
FWD  INBD 
INTERLOCK VALVE 
CONTROL CABLE 
GROUND SPOILER 
INTERLOCK VALVE 
B 

Ground Spoiler Interlock Valve and Ground Spoiler Control Valve
Figure 6

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A 737-300/400/500MAINTENANCE MANUAL
28V DC
BUS 2
C440
AUTO SPEED

M394 DIODE HEATBRAKE
A SINK (P6)
P6-2 CIRCUIT BREAKER PANEL

B
DS2< 60 KNTREVERSEDBRIGHT
THRUST
R165 REJECTED
S650 REJECTED TAKEOFF RELAY

< 60 KNT
> 60 KNT
TAKEOFF SW (P8) (E3-2) BDIM
A R87 AUXILIARY
DS1
> 60 KNT DIM RELAY (P6)
B
SPEED BRAKE TEST

< 60 KNT
K2 LEFT
SPEED BRAKE
OUTBOARD
DS4
ARM/M6
123
K1 RIGHT
ARMED
WHEEL
LOWER
OUTBOARD
SPEED
LEFT OUTBOARD > 60 KNT
S276 SPEED
WHEEL
WHEEL K4
BRAKE ARMING RIGHT OUTBOARD
SPEED
SPEED
1
R INBD
SW RIGHT INBOARD
SIGNAL & SQUAT LEFT INBOARD
K3 LEFT INBOARDWHEEL SPEED
C
S289 SB TEST RAISE
AND SQUAT
INBOARDSWITCH 1 WHEELS
ANTI SKID DS3 M359 SPEED BRAKE LEVERINOP DET
B
ACTUATOROUTBOARD S315 SB TEST
WHEELS
ANTI SKID > 60 KNTSWITCH 2 INOP DET
M162 ANTI SKID CONTROL
UNIT (E3-2)

G
< 60 KNT
G
L441 SPEED BRAKESWITCH 3S316 SB TEST ARMED LIGHT
A
K5 GOAROUND
A
4 SEC
P2-2 PILOTS CENTER PANEL

L442 SPEED BRAKEGNDDO NOT ARM LIGHT
P1-3 CAPTAIN'S FLIGHT INSTR PANEL
4 SEC ADV THROTTLE ADV THROTTLE
K7 AIR
AIR
DS 1
SENSING C
　
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