EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-31-00
 ALL  ú ú 01 Page 102 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Column force below minimum tolerance and autopilot travel excessive above 125 knots during flight column forces Low control Control column can be moved forward and/or aft moderately without elevator surface movement (elevator dead band). After movement, forces are normal or more than the limit, power on.  leakage in pitot system and/or test equipment 1) Air pressure internal leakage Feel actuator bearings components and/or centering unit Worn feel and Worn bearing or bearings components and/or centering unit Worn feel and torque tube on aft input bearings binding  Test pitot lines for leak-age (AMM 27-31-17/501) is 10 to 14 pounds. actuator crank attach bolt the breakout force at the tube crank. Make sure that from the aft input torque centering unit output rod actuator. Disconnect the to extend the feel cycle the control column With hydraulic power off, Do the system test - power AMM 27-31-00/501. mode operation per AMM 27-31-00/501. mode operation per Do the system test - power Disconnect cables from aft torque tube. from the bearings of the movement or grinding sounds there is no ratcheting by hand, make sure that pilot PCU. While turning elevator PCU, and auto-feel and centering unit, input rods to the elevator input torque tube, and  AMM 27-31-67/401. feel actuator per Replace elevator Replace elevator 401. per AMM 27-31-64/ centering unit feel and 401. per AMM 27-31-64/ centering unit feel and Replace elevator Replace aft input AMM 27-31-71/401. torque tube per 

H55366
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-31-00
 ALL  ú ú 01 Page 103 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Column force below minimum tolerance and autopilot travel excessive (Cont) excessive Column force  2) Hydraulic pressure from feel computer low 3) Bad feel actuator 4) Bad feel and centering unit Bad check valve package hydraulic modular controls in the flight  AMM 27-31-00/501 Replace and rerun test per AMM 27-31-00/501 lic pressure lines and Disconnect flexible hydrau-return lines from feel actuator located on feel and centering unit. Attach a hydraulic pressure gage to each of the four lines (Range 0-1500 psi). Plug open ports in feel actu-ator. Set stabilizer B dimension at 41.57 |0.01 inches. Pressurize pitot system to 0.50 |0.05 psi. Pressure at pressure lines return line pressure. Pressurize pitot system to 3.5 |0.05 psi. Pressure at pressure lines should be line pressure. Remove pressure from pitot system. Pressure at pressure lines Replace and rerun test per return line pressure should be 290 |35 psi above 1385 |150 psi above return should be 200 +25 psi above Do a check of hydraulic modular package controls hydraulic leakage from the flight  401) (AMM 27-09-21/ modular package hydraulic flight controls Replace the 401) (AMM 27-31-64/ Replace feel and centering unit 401) (AMM 27-31-14/ actuator 401) (AMM 27-31-37/ computer Replace feel Replace feel 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-31-00
 ALL  ú ú 01 Page 104 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
(Cont) tolerance below minimum autopilot travel excessive and Column force  2) Hydraulic excessive 1) System friction high feel computer pressure from 3) Bad feel actuator centering unit 4) Bad feel and  Problem elevator centering may be excessive. Refer Check for chafing cables, to neutral, system friction elevator does not return Check elevator centering per AMM 27-31-00/501). If to troubleshooting item: misaligned or bad pulleys or fairleads, foreign objects interfering with cable or control linkage movement. Cycle control column through full travel. Operation shall be smooth without binding or rough spots Same as 2) troubleshooting item: Column force below minimum tolerance and autopilot travel excessive Replace and rerun test per AMM 27-31-00/501 Replace and rerun test per AMM 27-31-00/501  Replace feel Repair or replace Replace feel bad parts. Remove foreign objects computer (AMM 27-31-37/ 401) actuator 401) centering unit Replace feel and (AMM 27-31-14/ 401) (AMM 27-31-161/ 
　
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