(b)  
Make sure the lever latch is in the DOWN detent on the control stand.

 (c)  
In the lower nose compartment, make sure you can easily install the rig pin S/B-1 through the forward drum quadrant (Fig. 502).

 (d)  
If you cannot easily install the rig pin, adjust the lower control rod: 1) Disconnect the top end of the lower control rod from the

 idler link (Fig. 502). 2) Install the rig pin S/B-1 in the forward drum quadrant. 3) Loosen the checknut on the lower control rod. 4) Adjust the lower control rod until you can easily install
 the rod end bolt. 5) Install the bolt with a washer below the head to attach the lower control rod to the idler link.
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A

737-300/400/500
MAINTENANCE MANUAL

GROUND SPOILER

TO MAKE SURE YOU GET THE CORRECT CABLE TENSION,

PERMIT THE AIRFRAME TEMPERATURE TO STABILIZE (|5 DEGREES) FOR A MINIMUM OF ONE HOUR.
YOU MUST ADJUST THE SPEED BRAKE CABLES WHEN THE TENSION IS MORE THAN |15 POUNDS FROM THE VALUES IN THE TABLE I.
Speed Brake Control System - Rig Pin Locations and Cable Tensions Figure 501

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737-300/400/500MAINTENANCE MANUAL
SPEED BRAKE  DOWN
SEE B
CONTROL LEVER

IDLER LINK  ARMED 
SEE  A  FLOOR CABIN CONTROL  CHECKNUT ROD CONTROL LOWER  ROD CONTROL UPPER 
SPRING  SCREWS 
A  DETENT FLIGHT 

SPEED BRAKE
UP
FORWARD DRUM SPEED BRAKE LEVER ACTUATOR
A 
FWD  INBD B 
RIG PIN S/B-1  A 
CAM ROLLER  SPRING DETENT  ROLLER  MARK INDEX 1  RIG PIN S/B-1 HOLE 
LEVER ARM 

ARMED DETENT
SPEED BRAKE
LEVER POSITION
SENSOR SPEED BRAKE
CAM ARMING SWITCH
2
ROD MOUNTING BRACKET
2
LEVER ARM ADJUSTMENT BOLTS
CONTROL ROD (2 LOCATIONS)
MOUNTING BOLT 2 FORWARD
FLIGHT DRUM
DETENT QUADRANT
CABLE SBB ADJUSTABLECABLE SBA CONTROL ROD 2
A-A
1
THE ROLLER ALIGNS WITH THE INDEX MARK WHEN THE SPEED BRAKE CONTROL LEVER IS IN THE DOWN POSITION
2
AIRPLANES WITH SPEED BRAKE LEVER POSITION SENSOR
Speed Brake Forward Drum and Linkage Adjustment Figure 502
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 (e)
(f)

(g)

A
737-300/400/500MAINTENANCE MANUAL
 6) Install the washer and nut on the bolt.
 7) Tighten the checknut on the rod end.
 8) Make sure you can see the rod end through the inspection

 hole on the control rod.Make sure the pointer on the aft face of the speed brake lever aligns with the detents: 1) Move the speed brake lever to the DOWN position. 2) Make sure the pointer aligns with the center of the DOWN
 marker on the control stand. 3) Move the speed brake lever to the ARMED position. 4) Make sure the pointer aligns with the center of the ARMED
 marker on the control stand. 5) Move the speed brake lever to the FLIGHT DETENT position. 6) Make sure the pointer aligns with the center of the FLIGHT
 DETENT marker on the control stand. 7) Move the speed brake lever to the UP position. 8) Make sure the pointer aligns with the center of the UP
 marker on the control stand. 9) Move the speed brake lever to the DOWN position.Make sure the travel of the speed brake lever is 48-1/2 |1/2 degrees: 1) Move the speed brake lever from the DOWN position to the UP
 position. 2) Make sure the speed brake lever moves 48-1/2 |1/2 degrees. 3) Move the speed brake lever to the DOWN position.If the speed brake lever does not align with the markers or the travel is not in the limits, adjust the speed brake lever: 1) Make sure the lever latch is in the detent on the control
　
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