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position. the handle is in to operate after Auto Speedbrake the fully-extended actuator continues  Speedbrake actuator Speedbrake actuator Speedbrake cables rig tensions are out of lubrication assembly needs Forward drum limit switch has faulty internal is out of rig  Speedbrake actuator. (AMM 12-22-81/301). (AMM 27-62-00/501). S/B-2 and S/B-3 in the quadrants. Check tensions on cables SBA and SBB mechanism. drum of the speedbrake fully extends and the that the actuator Apply 28V DC to D1084, drum assembly Lubricate forward motor stops running. to ground. Make sure a jumper from pin 1 pins 7, and connect forward drum assembly. swing free of the Allow actuator to rod end of the Auto Disconnect the forward SB-1 in the forward Install the rig pin Install rig pin S/B-1,  Speedbrake actuator If the Auto speedbrake Adjust the (AMM 27-62-31/401). (AMM 27-62-00/501). (AMM 27-62-21/401). (AMM 27-62-31/401). replace the continues, remove forward drum and replace the If the problem continues to run, assembly actuator install the rig pin cannot easily mechanism if you to required table Adjust cables values 

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 ALL  ú ú 01 Page 103 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 
Speedbrakes do do not operate Ground spoilers as speed brakes do not operate Flight spoilers extension, or not retain set position No spoiler direction only motion in one  slipping mechanism defective defective defective speedbrake body interlock valve is control valve is cable is bad Ground spoiler Ground spoiler Ground spoiler interlock valve Spoiler mixer is Ratio changer input rod disconnected Lever brake Insufficient or wheel well Broken or disconnected cable cable tension  defective if drum can be leaking control valve. (AMM 27-62-61/501). (AMM 27-62-51/501). Check for damaged or Check operation of interlock valve Check operation of interlock valve cable input rod movement. Move control wheel and check for ratio changer Check cable system. (AMM 27-62-00/501). rotated. Check cable tension forward drum by-hand. Lever brake mechanism is attempting to rotate lever brake mechanism by Check locking action of  (AMM 27-62-21/401). necessary Adjust or replace Rig speedbrake (AMM 27-62-41/401). (AMM 27-62-61/401). (AMM 27-62-51/401). necessary Replace valve linkage as cable as necessary Adjust or replace Replace interlock valve and valve (AMM 27-61-31/401). necessary. mixer Replace spoiler Repair or replace components as (AMM 27-62-00/501). necessary. cables mechanism as Adjust cables as 

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 ALL  ú ú 01 Page 104 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 
One ground  Defective ground  Operate ground spoiler and  Replace defective 
spoiler does not  spoiler actuator  check for external leadage  actuator 
operate correctly.  overheating. or for evidence of  AMM 27-62-94/401). (AMM 27-62-71/401 
Ground spoiler  Defective ground  Check actuator linkage for  Replace actuator 
float  or actuator linkage spoiler actuator  loose, broken, or worn parts.  or actuator AMM 27-62-94/401). or AMM 27-62-82/401 (AMM 27-62-71/401, necessary linkage as 
For automatic  Speedbrake lever  Operate automatic  Adjust or replace 
actuation,  brake mechanism  speedbrake system  mechanism as 
speedbrake control  is defective, or  (AMM 27-62-00/501).  necessary 
lever and system  out of adjustment  Check if electric actuator  (AMM 27-62-21/501). 
do not actuate or  operates, but lever brake 
do not actuate  slips. 
fully UP or DOWN 
(force required  Speedbrake arming  Electric actuator does  Adjust or replace 
to rotate control  switch is bad  not operate.  arming switch 
lever not  or out of  (AMM 27-62-34/501). 
excessive).  is defective adjustment Speedbrake lever electric actuator  (AMM 27-62-31/401). Replace actuator 
　
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