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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H52366
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM
3 PROBABLE CAUSE

REMEDYISOLATION PROCEDURE
Moderate lateral
Vibration present vibration in
(Cont) fuselage. Flaps Check for free-play Loose or worn Repair or replaceUp.
in rudder.
rudder hinge (AMM 27-21-00/401,

(Cont)

bearings and/or AMM 27-21-11/401). fittings Loose or worn rudder Replace bearings. PCU rod end bearings
Check for abnormal
Rotor out-of-balance Balance rotor. vibration in APU
or worn or defective Replace bearings. shaft bearings
Moderate Check for free-play
Loose or worn tab Repair or replace vibration in
rod ends loose or worn parts wing root area.
in aileron tab.
(AMM 27-09-91/401). Flaps up.
Loose or worn tab Repair or replace hinge bearings loose or worn parts and/or fittings (AMM 27-11-34/401).
Loose or worn Repair or replace in aileron.
1 Check for free-play aileron hinge loose or worn bearings and/or parts fittings and/or (AMM 27-11-11/401). hinge bolts
Loose or worn Repair or replace aileron balance loose or worn panel hinges, hinge parts fittings, and/or (AMM 27-11-31). bolts
Loose or worn Repair or replace aileron PCU rod end loose or worn bearings, cables, parts. and/or fittings
Check aileron cable
Cable tension below Tension cable tension
requirement (AMM 27-11-00/401).
Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 9)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 05-51-67
 ALL  ú ú 01 Page 213 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H52712
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM  3  ISOLATION PROCEDURE  PROBABLE CAUSE 
 REMEDY 
Moderate Flaps up. wing root area. vibration in  of aileron. Check weight and cg  weights. balance adjust accounted for repaint not properly Repair and/or  re-balance aileron. Remove and weigh ____NOTE Remove and aileron tab. 
operation. continued safe tolerance for within balance Aileron must be 
Visual inspection of area wing and wing root  panels wing trailing edge Mis-adjusted upper  Adjust panels. 
fairing edge flap track outboard trailing Loose or damaged  Repair or replace. 
edge on aft flap defective trailing Delaminated or  Repair or replace. 
air exhaust louvers Mis-adjusted ram  Adjust louvers. 
air inlet door seals Separation or ram  (AMM 21-52-21). Repair or replace 
and wing doors landing gear strut Mis-adjusted main  501). and AMM 32-13-21/ (AMM 32-13-11/501 Adjust doors 
extended. area. Flaps in wing root High vibration  flap assemblies. in trailing edge Check for free-play  rollers. flap carriage bolts on hinged Loose attachment bearings Wear of the foreflap sequencing carriage  (AMM 27-51-47/401). Re-torque bolts (AMM 27-51-07/401). Replace bearings 
assembly bearing and drum mechanism cam roller segment actuation inboard flap aft Worn or defective  Item 95). (IPC 57-51-19-02, Replace bearing 

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 10)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 05-51-67
 ALL  ú ú 01 Page 214 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H57480
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM 
 ISOLATION PROCEDURE  PROBABLE CAUSE 
 REMEDY 
(Cont) extended. area. Flaps in wing root High vibration  Visual inspection of flaps and wing. assemblies. (Cont) in trailing edge flap Check for free-play  panels. trailing edge Adjustment of wing Worn or defective mechanism aft flap drive  and IPC 57-30-00-15A). (AMM 27-51-34/501 Adjust panels and 2305). Items 95,100,220, Repair or replace (IPC 57-51-19-02, 
　
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