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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
value as 1 inch shaft is same servo output of each autopilot start rotation necessary to Use force Porpoising on than 4.5 pounds measurement more friction force autopilot static both A and B  Faulty Bearings Faulty Autopilot Service  turn freely. lower Torque Tube do not The attach bearings in the Torque Tube. Disconnect elevator PCU input rods at lower than 1 inch pound. servo output shaft is more Disconnect Autopilot Servo rotation of each autopilot necessary to start torque tube, use force control rods at lower below the index mark. Repeat the static friction 0.30 inch above and then positioned 0.10, 0.20 and elevator trailing edge measurement with the  Replace faulty bearings. Replace autopilot friction force. exhibits too much servo that 27-31-00 737-012). balance (Task friction and elevator surface 500 System Test per AMM 27-31-00/ system friction Check elevator 
pound  at Input Quadrant Faulty Bearings Faulty PCU  hand (there is indication disabled, move elevator With hydraulic power Disconnect all four Turn Torque Tube slowly by from the input Torque Tube. elevator control cables freely at both PCUs, If the rods do not move by hand. PCU input rods up and down not rotate freely. The attached bearing does AMM 22-21-11/401. sensor per crank of the neutral shift Actuator jackscrew from the Disconnect the Mach Trim  Replace faulty bearings. PCU Replace faulty AMM 27-31-71/401. bearings per replace faulty quadrant and Remove input 
of binding and friction). 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Cranks not secure Faulty control bearings column support Improper Seal Adjustment Cable System  If friction force measure-0.8 lb ments stay more than If friction force measure-column per AMM 27-31-51. of seal at base of control 0.8 lb, check adjustment as 0.8 lb. procedures is more than ments from previous Disconnect all four friction force measure-ments have the same value neutral position. All and then aft of the normal 0.25 and 0.50 inch forward displaced approximately with the control column friction measurement again position. Do static normal column neutral friction force near the Measure the static approximately 0.01 inch. start a small movement minimum force necessary to friction which is the control column static using tool F70321, measure from the forward quadrant, elevator control cables  crank. Autopilot servo elevator Secure the Replace faulty support bearings. control column Adjust seal and do previous step. Make sure pulleys bulkhead. pressure seals in aft the wings and also those over cable guides, and 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Contamination Faulty autopilot rivets servo shear  compounds. grease or anti-corrosion of the balance bays with contamination of the walls that there are no AMM 27-31-44. Make sure are adjusted per bays to be sure the seals Check elevator balance Check the shear rivets the center of the rivets. a lockwire freely through servo output arm by passing installed in each autopilot 

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 ALL  ú ú 01 Page 119 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ELEVATOR AND TAB CONTROL SYSTEM - MAINTENANCE PRACTICES
_______________________________________________________
 1.  General_______
　
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