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Intermittent 15 to 20。  Unsequenced foreflap - Check sequencing carriage  Replace rub strips 
control wheel  outboard flaps  rub strips for wear, galling 
requirement in flight  and binding 
at any flap setting other than 0  Check foreflap track roller for wear and/or binding  Replace roller 
Visually check tracks, rollers, flaps and other areas for contamination which may cause binding Check foreflap toggles for damage Check foreflap toggle pivot bolts for damage Check foreflap track for structural interference with midflap  Clean and lubricate Replace toggle Replace bolt Remove interference 
Intermittent 15 to 20。  Asymmetric extension  Check clutch breakout load  Adjust clutch (Ref 
control wheel  or retraction of inboard  OHM 57-53-24) 
requirement in flight at any flap setting  aftflap  Visually check tracks, rollers, flaps and other areas for contamination which may cause binding Check drive boom support fitting for damage Check drive cable tension Check aftflap pushrods for damage and/or structural interference  Clean and lubricate Replace or reword fitting Adjust tension Remove interference 

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27-09-400  Jun 20/88 
Page 104 
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TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Intermittent 6。 to 10。 control wheel requirement in flight at any flap setting Consistent 2。 to 10。 control wheel requirement in flight at any flap setting  Leading edge slats No. 1 or 6 skewed Misrigging  Loose outboard flap track aft support fittings  Outboard aftflap drive mechanism  Outboard midflap carriage Flight director balls  Outboard midflap carriage  Leaf spring at outboard flap carriages  Check detent arm for damage or misadjustment. Visually inspect tracks for contamination Leading edge actuator malfunction Check aileron, flap and spoiler surface rigging Check track support fittings for tightness and check track shims Check hinge bushing, check for interference between fairing and mechanism, and check support arm roller travel in track Check rollers for wear and deterioration Check leveling of balls Check forward support thrust bearing for wear and deterioration Check rigging of leaf springs  Replace detent or readjust. Clean and lubricate tracks. Replace actuator Rerig, if required, or reshim outboard flapsTighten and/or add shims as required. Recheck WCP alignment with trailing edgesReplace and/or readjust Replace AdjustReplace and recheck WCP alignment with trailing edgesAdjust springs and adjust flaps trailing edge alignment 

500 
May 15/70  27-09-400 
Page 105 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Consistent trim change, when flaps move from flap 0 to flap 1, of 60 to 120 control wheel Consistent trim requirements of 60 to 120control wheel with WCP trailing edge rigging within tolerances and symmetrical Consistent trim requirements of 60 to 120control wheel at flaps 15 to 40 only  Outboard midflap deflection control stop outboard roller Rub strip interference with outboard end of outboard midflap Outboard flap screw fairings Warped flap or aileron surface Drive screw upstop clearance rigging Flaps 40 mid-to-airflap gaps  Check clearance between ramp and roller Check clearance between rub strip and midflap Check fairing preload Check surface trailing edges for straightness within .12 inch for full length Check outboard flap screws upstop clearances Check gap symmetry  Adjust ramp for proper clearance. Recheck WCP trailing edge alignment Shim flap carriages and adjust deflection ramp. Recheck WCP trailing edge alignment Readjust Replace warped components Adjust as required Adjust symmetry within .05 inch 
Consistent trim required on aileron or rudder with flaps extended  Flaps 40 interference between outboard aftflap and screw fairing tailcone Fairing tracks in outboard flaps screw fairings Fractured flap carriage spindle  Check fairing tailcone clearance with outboard aftflap at flaps 40 setting Check security of track attachments in fairings Remove panels over outboard flap carriage spindle and check for fractured spindle  Shim flaps at carriage and/or adjust fairing preload at flaps 0 Rework or replace fairings if damaged Replace flap carriage spindle (AMM 27-51-81/401) 
　
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