EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-00
 ALL  ú ú 01 Page 104 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Trim switch binds Excessive pedal rudder trim travel Insufficient adjustment moves Rudder pedal aft position Pedal adjustment binds in full forward or full adjustment forces Restricted trim switch travel  Binding in trim Binding between switch knob and lightplate switch within trim switch Foreign objects rigged installed or improperly actuator Rudder trim linkages and rudder trim actuator or centering unit jackshaft bad parts in Foreign objects or structure interfering with Insufficient clearance between input rods or cranks or quad-rants near full travel positions Loose, worn or assembly Interference Jackscrew over rotated in adjustment nut flexible shaft Bad or binding jackshaft assembly or bad parts in  lation (AMM 27-11-121/401) Check trim switch instal-(AMM 27-21-00/501) Check rudder trim switches Check for bad parts or (AMM 27-21-00/501) Check system rigging parts for loose, worn or bad or interference in area of rudder trim actuator and centering unit With rudder trim actuator near full travel position, check for clearance between rods and cranks, etc. Fwd stops should be contacted before linkages run out of travel Check for foreign objects Check jackshaft assembly (AMM 27-21-00/501) Check that rudder pedals are adjusted fully forward or fully aft determine if bad foreign objects in jackshaft assembly Remove flexible shaft, Check rudder trim switches  (AMM 27-11-94/401) binding Adjust switch height to prevent (AMM 27-11-94/401) Replace switch Repair or replace Remove interference object or interference bad parts Remove foreign Adjust system as necessary bound mechanism (AMM 27-11-94/401) Backdrive rudder pedal adjustment crank up to 100 pound-inches torque to free Replace bad parts or repair bad Remove foreign object, replace flexible shaft Replace switch 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-00
 ALL  ú ú 01 Page 105 ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Rudder trim  Foreign objects  Check for foreign objects  Remove foreign 
control system  interfering with  obstructing movement of  objects 
restriction  Trim actuator bad torque tube bad parts in in feel and bad bearing Binding, worn or centering unit Binding in power control unit valve input rods or power control units Rudder control system jammed or binding system components and linkages Binding, worn or  Check trim actuator (AMM 27-21-00/501) system is binding 401) bearings. (AMM 27-21-82/ unit and standby actuator. ing unit ,power control quadrant, feel and center-connecting torque tube to rudder aft control Disconnect linkages Rotate torque tube to check for interference With rudder power control unit and standby actuator input rods disconnected from torque tube, cycle input rods by hand to check for binding input linkages excessive forces. If excessive forces are encountered, rudder control Check rudder pedals for system components and linkages Isolate feel and centering unit, examine pivot bear- (AMM 27-21-87/401) Replace actuator control unit Replace bad power Repair or replace Refer to trouble item on binding or jammed rudder control system bad parts bad parts Replace worn or 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-00
 ALL  ú ú 01 Page 106 ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Excessive yaw standby or from standby to A or B hydraulics in from A and B when you switch flight. hydraulics to flight Trim drifts from setting during Excessive play in rudder surface Rudder centering faulty  Standby actuator out of rig Trim actuator brake inoperative High system friction and poor centering Worn or bad parts Rudder system out of rig unit Bad centering Excessive system friction  Examine the system rigging Check rudder centering (AMM 27-12-00/501) troubleshooting Check rudder centering to bad rudder centering may be excessive. Refer neutral, system friction rudder does not return to (AMM 27-21-00/501). If area Check for worn or bad bearings or hinges in fin (AMM 27-21-00/501) Check system rigging centering unit may be bad Check for rubbing or misaligned cables. Check for foreign objects interfering with system worn or bad parts. Check pedal breakout force. If it exceeds 18 lbs, system friction may be too high. Check for loose, Check pedal breakout force. If it is less than 10 lbs, (AMM 27-21-00/501).  Adjust the system, if it is (AMM 27-21-87/401) Replace trim actuator Remove source of friction bad part Replace or repair Adjust as required unit bad centering bad parts. Replace worn or Remove foreign object Replace or repair necessary. 
　
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