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27-51-00
ALL ú ú 01 Page 104 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Flaps will not extend hydrauli-cally or elec-trically in flaps 25 to 40 range inflight (Cont) 9. Midflap car-riage forward and aft flight rollers jammed and skidding at flap jack-screws #1 and #8 10. Outboard aft-flap drive mechanism failure or jam Outboard fore-flap sequenc-ing carriage toggle failure (unsequenced foreflap) plus galled or damaged fore-flap carriage rub strips Outboard aft-flap track rollers jammed flap drive mechanism jam or failure Inboard aft-11. 12. 13. Outboard fore-flap track rollers 14. Inspect rollers for free rotation. Inspect tracks for evidence of skidding. Inspect roller OD for signs of skipping/skidding Inspect drive mechanism in outboard screw fairings Inspect outboard foreflap toggles and sequencing carriages for failure or binding and rub strips for galling Inspect rollers for free rotation. Inspect tracks for evidence of skidding Inspect mechanism for failed parts. Check drive clutch setting Inspect rollers for free rotation. Inspect tracks for evidence of skidding Replace roller if binding or there are signs of the roller skipping/ skidding, relube all main carriage rollers Repair or replace damaged parts Replace damaged parts Replace rollers if binding Replace parts or readjust clutch Replace rollers if binding
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-51-00
ALL ú ú 01 Page 105 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Flaps will not 15. Transmission Disconnect transmissions Replace transmis-
extend hydrauli- torque brake and check torque brake sion if torque
cally or elec- setting too settings in the following brake settings
trically in flaps low order: not correct
25 to 40 range #2 and #7 (887 lb-in. min)
inflight (Cont) #4 and #5 (330 lb-in. min) #1 and #8 (582 lb-in. min) #3 and #6 (365 lb-in. min) Ref 27-51-71, I/C
Excessive force Excessive cable Check cable tension per Adjust cable
required to tension 27-51-00, Fig. 501 tension
position flap Rubbing cables, Check that pulleys align Repair or replace
control lever misaligned or defective pulleys Binding flap control valve Binding flap control quadrant with cables within 2 degrees. Check cable runs for free running pulleys, and foreign objects Remove lower pan from flap control unit and disconnect trailing edge cam link from crank to check freedom of bellcrank. Actuate bell-valve slide Disconnect WFA and WFB cables from flap control quadrant. Remove lower pan from flap control unit and disconnect trailing edge cam link from bell-crank. Manually rotate quadrant to check freedom of quadrant bearings (Ref 27-51-77, 27-51-79, R/I) defective parts. Remove foreign objects Replace trailing edge flap control valve (Ref Replace defective flap control quadrant bearings R/I)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-51-00
ALL ú ú 01 Page 106 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
not hydraulically electrically but Flaps operate tolerance are not within dimensions X2-X1 Flap jackscrew WFB cables tion (Position 2) cable Broken control pressure No hydraulic hydraulic motor Defective flap in bypass posi-Flap bypass valve tension on WFA, adjustment or low ging out of Flap lever rig-control unit Defective flap tion in flap control system Excessive fric- is defective power is present, valve flap bypass valve. If OFF, check for power at OFF. With both switches break detector switch is Check that flap cable master switch is OFF. within tolerance. Refer to A/T Trailing Edge Flap System, cable Check cable run for broken has malfunction supply trouble shooting Check hydraulic pressure pressure is present, motor pressure at motor. If Check for hydraulic system and that alternate flap circuit breaker is closed Check that FLAP VALVES properly adjusted Check that flap system is lever operating forces are Check that flap control (Ref 27-51-57, 27-51-82, (Ref 27-51-74, R/I) R/I) valve. (Ref (Ref 27-51-00, A/T) R/I) cable Replace broken hydraulic motor. Replace flap Replace bypass cable tension. Check rigging and control unit. Replace flap Shooting Chart this Trouble Control Lever in Position Flap Force Required to See Excessive
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