27-61-00
 ALL  ú ú 01 Page 14 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Flight Spoiler Electrical Schematic
Figure 9

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 27-61-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
FLIGHT SPOILER CONTROL SYSTEM - TROUBLE SHOOTING
1. Flight Spoiler Control System Trouble Shooting Chart
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Flight spoilers do not operate Spoilers do not start to rise control wheel within allowable rotation from spoilers do not rise to full up position Inboard or out-board flight spoilers do not operate neutral or  Shear rivets on spoiler control quadrant shaft are sheared No hydraulic pressure avail-able Insufficient tension in cables to actuator quadrants Spoiler-mixer cam follower out of adjustment Defective motor operated hydraulic shutoff valve Flight spoiler actuator out of adjustment  Check witness hole on aileron input crank lever Ref Chapter 29, Hydraulic System - Trouble Shooting Check cable tension Open grease fitting access covers on aft surface of spoiler-mixer. Rotate captain's control wheel clockwise 87` from neutral and then counterclockwise 87` from neutral. Check portion of cam at 87` that applicable cam follower is on maximum rise Check that spoiler shutoff valve position indicator moves to position 1 when spoiler switches are turned on and returns to position 2 when spoiler switches are turned off. If not, spoiler shutoff valve actuator is defective position  Replace shear rivets (Ref 27-61-41, AR) Adjust tension (Ref 27-61-00, Adjust Spoiler Control System Wing Cables and Actuators) Adjust spoiler mixer (Ref 27-61-00, A/T) Replace spoiler shutoff valve (Ref 27-09-221) Adjust flight spoiler (Ref 27-61-00, A/T) 

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 ALL  ú ú 01 Page 101 ú Feb 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Spoilers do not rise when control wheel is rotated from neutral Travel of adja-cent spoilers is restricted Spoiler does not fair One flight spoiler does not operate Excessive external leakage in spoiler actuator  Wing cables jammed or broken defective Tension in cables to actuator quadrants is low Actuator quadrant and/or actuator piston rod end improperly ad-justed connecting actuator quadrant Rivet sheared to gooseneck lever Flight spoiler actuator inoper-ative Spoiler-mixer  Check wing cable runs for broken or jammed cables quadrants when control mixer is defective if quadrant does not move correctly Check cable tension Check position of spoiler panel. If panel does not fair with control wheel in neutral position, quadrant and/or actuator piston rod end requires adjustment Check scribe marks on quadrant. If marks do not align, rivet is sheared. Check quadrant and actuator for cause of sheared rivet Check actuator quadrant movement when control wheel is rotated. Actuator is defective if quadrant moves correctly and spoiler does not Check spoiler-mixer output wheel is rotated. Spoiler- Correct as required mixer Adjust cable tension (Ref 27-61-00, Adjust Spoiler Control System Wing Cables) Adjust actuator quadrant and/or actuator piston rod end (Ref Replace shear rivet (Ref 27-61-61, AR) Replace spoiler actuator Replace spoiler actuator 27-61-00, A/T) Replace spoiler-

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 ALL  ú ú 01 Page 102 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
　
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