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27-09-71
ALL ú ú 01 Page 102 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
B. Asymmetric Inboard Aftflap Extension or Retraction
(1)
Visually check for contamination such as ice, snow, mud or sand which could cause binding. Also check for damaged components, structural interference, and misrigged cables. A malfunctioning inboard aftflap clutch could cause asymmetric extension or retraction. The clutch should be adjusted or replaced as required.
C.
Leading Edge Outboard Slats Skewed
(1)
Slats No. 1 and No. 6 are located chordwise in the takeoff position by a system of spring-loaded detents. If these detents are improperly adjusted or have failed, the slat may assume a position skewed relative to the leading edge of the wing. This will cause a change in lateral trim of a magnitude of 6 degrees of wheel. Should this occur, the mispositioned slat can be observed either from the cockpit or on the ground. A rapid check of the detents system may be made by applying a load normal to the leading edge of the slat in the takeoff position. A load in excess of 90 pounds applied at either end should be required to displace the slat from the detents. Should the slat release at a lower load, the detent torsion tube should be checked for correct preload and structural integrity and the detent arm adjusted.
ú D. Flight Control Surface Trim Required ú (1) A fractured outboard flap carriage spindle may result in an ú asymmetrical flap condition that requires some in-flight corrective ú action (a combination or aileron or rudder trim to maintain level ú flight).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-09-71
ALL ú ú 02.1 Page 103 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
3. __________________________________________
Lateral Trim/Control Troubleshooting Chart ____ If the following trouble items occur, they will appear abruptly rather
NOTE:
than gradually such as with normal wear items.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Consistent trim extended. with flaps aileron or rudder required on flap setting. Intermittent 15 in flight at any wheel requirement to 20` control flaps 0. other than flap setting Intermittent 15 in flight at any wheel requirement to 20` control carriage spindle Fractured flap inboard aftflap retraction of extension or Asymmetric Unsequenced board flaps foreflap - out- spindle. check for fractured Remove panels over outboard flap carriage spindle and interference. damage and/or structural Check aftflap pushrods for Check clutch breakout load. Check drive cable tension. fitting for damage. which may cause binding. Check drive boom support areas for contamination rollers, flaps, and other Visually check tracks, with midflap. bolts for damage. structural interference Check foreflap track for Check foreflap toggle pivot damage. which may cause binding. for wear and/or binding. Check foreflap toggles for areas for contamination rollers, flaps, and other Visually check tracks, Check foreflap track roller Check sequencing carriage galling, and binding. rub strips for wear, 401). (AMM 27-51-44/ carriage spindle Replace flap ference. Remove inter-Remove inter-ference. 401). (AMM 27-51-24/ 301). (AMM 12-22-51/ Replace bolt. Replace or rework Clean and lubri-(See OHM 57-53-24) fitting. Adjust clutch Adjust tension cate 401). (AMM 27-51-47/ 301). (AMM 12-22-51/ 401). (AMM 27-51-47/ Replace roller. Clean and lubri-Replace toggle cate Replace rub strips
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-09-71
ALL ú ú 02.1 Page 104 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
flap setting. flight at any requirement in 10` control wheel Consistent 2 to flap setting. flight at any requirement in 10` control wheel Intermittent 6 to carriages outboard flap Leaf spring at Outboard aftflap carriage Outboard midflap indicator (ADI) carriage Outboard midflap Attitude director drive mechanism support fittings flap track aft Loose outboard Misrigging No. 1 or 6 skewed Leading edge slats Check rigging of leaf springs. fairing and mechanism, and thrust bearing for wear and Check rollers for wear and Check hinge bushing, check check support arm roller for interference between Check leveling of balls. Check forward support travel in track. deterioration. deterioration. fittings for tightness and check track shims. Check track support spoiler surface rigging. Check aileron, flap, and contamination. inspect tracks for malfunction Leading edge actuator or misadjustment. Visually Check detent arm for damage 501). (AMM 27-51-34/ Adjust springs and alignment trailing edge adjust flaps 501). (AMM 27-51-34/ readjust. Replace and/or Replace and recheck WCP align-ment with trailing Adjust Replace edges 401). (AMM 27-51-49/ Tighten and/or with trailing WCP alignment required. Recheck add shims as edges 501). (AMM 27-51-34/ Rerig, if required, or reshim outboard flaps 401). (AMM 27-81-41/ Replace actuator and lubricate readjust. Clean Replace detent or tracks.
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