(6)
Icing conditions during cold weather operation can cause lockout if procedures for operating during these conditions are not followed. See Cold Weather Maintenance in Chapter 12.
(7)
If a lateral trim change is noted when lockout occurs, the probable cause may be failure in the inboard or outboard aftflap mechanisms, a drive failure which causes the flap asymmetry shutoff system to function, or an unsequenced foreflap.
B.
For trouble items not related to flap drive system inflight lockout, refer to appropriate trouble headings in trouble shooting chart.
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A
737-300/400/500MAINTENANCE MANUAL
2. Trailing Edge Flap System Trouble Shooting Chart
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Flaps will not extend hydrauli-cally or elec-trically in flaps 0 to 25 range inflight Structural fail-ure and/or interference Power unit gear-box binding Angle gearboxes binding Right angle gear-boxes binding Transmission internal jam Visually inspect all flap and flap drive components where relative motion occurs, for structural failure or foreign object damage Disconnect gearbox and check for free rotation Disconnect gearboxes and check for free rotation Disconnect gearboxes and check for free rotation Disconnect transmissions from torque tubes and jackscrews and check for free rotation Repair as required Replace gearbox if binding Replace gearbox if binding Replace gearbox if binding Replace transmis-sion if binding
Flaps will not extend hydrauli-cally or elec-trically in flaps inflight 25 to 40 range The following items are listed in descending order of effec-tiveness for causing flap drive system lockout but also weighted in order of probability of occurrence. The flap system should be inspected in the sequence listed. The items 1 thru 8 will discovered and corrected, no further checks are required. Items 9 thru 15 will not cause lockout when acting alone but require some combination with other items. The possible combinations of these items to cause lockout are: Items 9 + 10,11,12 or 14 Items 9, dual roller jam Items 10 + 9,11,12 or 14 Items 11 + 9,10,12 or 14 Items 12 + 9,10,11 or 14 Items 14 + 9,10,11 or 12 1. Midflap car-riage forward and aft flight rollers jammed and skidding at flap jack-screws 2,3,4, 5,6,7 (single roller) Inspect rollers for free rotation. Inspection tracks for evidence of skidding. Inspect roller OD for signs of skipping/ skidding Replace roller if binding or there are signs of the roller skipping/ skidding. Lubri-cate all midflap carriage rollers (Ref Chapter 12) cause lockout if found discrepant, therefore, if condition
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A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Flaps will not 2. Outboard flap Disconnect transmission Replace transmis-
extend hydrauli- drive trans- from torque tubes and jack- sion if bearing
cally or elec- mission output screws and check for free defective
trically in flaps bearing jammed rotation by rotating the
25 to 40 range and/or exces- output shaft with a small
inflight (Cont) sively corroded Jackscrew ball nut jammed or binding Structural failure and/or interference Power unit gearbox binding Transmission 4. 5. 3. internal jam Angle gear-boxes binding Right angle gearbox bind 6. 7. 8. side load on it. Check that bearing ID does not rotate relative to shaft. Check for signs of rust at the edges of the bearing seal. Inspect in this order: 2,7,1,8 Disconnect ball nuts. Clean ball screws. Check for free rotation and signs of gouging in ball nut grooves Visually inspect all flap and flap drive components where relative motion occurs, for structural failure of foreign object damage Disconnect gearbox and check for free rotation from torque tubes and jackscrews and check for free rotation Disconnect gearboxes and check for free rotation Disconnect gearboxes and check for free rotation Disconnect transmission Replace jackscrew assembly if bind-ing Repair as required Replace gearbox if binding Replace transmis-sion if binding Replace gearbox if binding Replace gearbox if binding
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