H56176
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27-31-00
ALL ú ú 01.1 Page 117 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
H56179
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-31-00
ALL ú ú 01 Page 118 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
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
H56180
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-31-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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