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For automatic  High friction in  Do a check on the friction  If the speedbrake 
actuation, the  the ground  of the speedbrake lever  lever forces are 
speedbrake control  spoiler control  (AMM 27-62-00/501).  less, replace the 
lever moves slow,  valve  If the forces are not out  ground spoiler 
feel normal. manual forces but the lever  mechanism slips. lever brake The speedbrake  the ground spoiler control lever forces again. valve input rod. Measure the speedbrake of tolerance, disconnect  the same, adjust lever forces stay If the speedbrake the mechanism control valve. 
(AMM 27-62-21/401). 

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 ALL  ú ú 01 Page 105 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
When automatically extended, with advance of thrust levers No. 1 or 2, speedbrakes do not retract. circuit breaker trips during automatic operation (force required to rotate control lever not excessive). system is armed on approach. Green Armed light illuminates. On landing Armed light extinguishes and amber Do Not Arm Auto Speedbrake Auto Speedbrake light illuminated.  Engine Throttle Switch, (lever No. 1) or (lever No. 2), is bad or out of adjustment. electric actuator is defective. Speedbrake lever switch is bad or out of adjustment. Engine Throttle  Adjust or replace engine throttle switch (AMM 27-62-04/401). Replace actuator (AMM 27-62-31/401). switch Adjust or replace engine throttle (AMM 27-62-04/401). 

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 ALL  ú ú 01.1 Page 106 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 SPEED BRAKE CONTROL SYSTEM - MAINTENANCE PRACTICES
__________________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is a task to supply the hydraulic power to systems A and B. There is also a task to remove the hydraulic power from systems A and B.
 B.  You must release the pressure from the hydraulic systems A and B before you do maintenance on the speed brake control system. This is to prevent injury to persons because of accidental operation of the control system during maintenance. You must keep maintenance stands and equipment away from the limits of travel of the control surfaces.
 C.  When you operate the hydraulic systems A and B, you must obey these conditions:
 (1)  A minimum of 1675 pounds (761 kilograms, 250 gallons) of fuel is necessary in each fuel tank to keep the hydraulic fluid cool. On hot days, or when the temperature of the fuel is more than 90°F (32.2°C), you must monitor the overheat indicators. Turn the pump switches off if the hydraulic fluid becomes too hot.
 TASK 27-62-00-862-001
 2.  Speed Brake Hydraulic Systems A and B Pressurization____________________________________________________
 A.  References
 (1)  
AMM 12-12-00/301, Hydraulic Servicing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 32-00-01/201, Ground Lock Assemblies

 B.  
Access

 (1)  
Location Zones
 101, 102 Control Cabin
 216, 217 Main Wheel Well

 C.  
Pressurize the Hydraulic Systems A and B

 (1)  
Supply the electrical power (AMM 24-22-00/201).

 (2)  
Make sure that the hydraulic reservoirs are full (AMM 12-12-00/301).

 S 862-003
 S 212-004
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 ALL  ú ú 02 Page 201 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
　
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