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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Over-sensitive pitch control in control wheel steering mode (Airplane over reacts to column input) (Cont) Interference at air pressure seals (pressure bulkhead, STA 1020) Foreign objects interfering with elevator system components Pulley binding on cable guard or bracket Fwd elevator quadrant binding or interfering with floor beam Fwd elevator quadrant bearings binding Pitch control wheel steering force transducer misrigged Sticky flexural pivot on force transducer installation Aft quadrant support defective Disconnect system as above. With column force exceeded per above check for interference at seals. Disconnect system as above. With column force exceeded per above, check for interference from foreign objects Release tension in elevator control system cables. Check pulleys to see if they rotate freely. (Pay special attention to pulley installations at STA 1064) Release tension in elevator control system cables. Inspect for interference. Release tension in elevator control system cables. Check for rough & binding bearings Check rigging procedure per 22-11-91, Adjustment/Test Remove pivot from installation and inspect for binding Release tension in elevator control system cables. Check for rough or binding bearings Replace air pressure seals and align cable thru seals and lubricate (Ref 20-10-101)Locate and remove objects Rework to clear or replace assemblyEliminate interference Replace bearings Rerig Replace pivot if binding Replace bearings
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Over-sensitive pitch control in control wheel steering mode (Airplane over-reacts to column input) (Cont) Autpilot fails system bite test Control cable tension repeatedly checks low after flight following normal rig procedures Elevator power control unit valves sticking Release tension in elevator control system cables. Check for roughness and binding at input cranks Replace elevator power control unit (Ref 27-31-101, R/I) Elevator feel and centering unit has excessive play Check input crank for backlash Replace feel and centering unit (Ref 27-31-151, R/I) Worn rivets in autopilot elevator actuator lever assembly Hold lever assembly and attempt to rotate at shear rivet area Remove assembly and replace rivets, (Ref OHM 27-09-05) NOTE: Refer to 22-11-0, Trouble Shooting, for further autopilot trouble shooting related to over-sensitive pitch control in control wheel steering mode. Rerig control cable as follows: 1. Increase cable rig load listed in cable tension chart (Ref 27-31-0, A/T) 2. Cycle system 25 times while maintaining Excessive cable tension relaxation Check control cable tension (Ref 27-31-0, A/T). If cable rig load is repeatedly more than 15 pounds below value listed in cable tension chart, cable is worn, or requires rerigging
increased rig load. 3. Reduce cable rig load listed in cable tension chart (Ref 27-31-0, A/T) 4. Cycle system 25 times while maintaining normal rig load (Step 3). NOTE: Do not allow cable rig load to relax below rig load established in Step 3.
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Control cable tension repeatedly checks low after flight following normal rig procedures (Cont) Check control cable for broken wires (Ref 20-20-31, I/C). 5. After approximately one week of service rig cable to normal rig load (Step 3). 6. Cycle system 25 times while maintaining normal rig load (Step 3). Replace control cable (Ref 20-10-91, R/I).
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本文链接地址：737 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 2(59)
