Vibration Symptom and Maintenance Action - In-flight Vibration Figure 201 (Sheet 6)
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 ALL  ú ú 01 Page 210 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H52008
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM  3  ISOLATION PROCEDURE  PROBABLE CAUSE 
 REMEDY 
Moderate vertical  Vibration present_________________ 
vibration in aft  (Cont) 
and forward fuse-lage. Flaps up. (Cont)  rod and bearings. Check elevator PCU  bearings elevator PCU rod end Worn or defective  Replace bearings. 
If both elevators 
exceed free-play 
limits, check the 
following: 
Check for worn  Worn or defective  Replace worn or 
bushings at out- bearings and/or  defective bearings 
board end of torque  bushings in output  and/or bushings 
tube  torque tube,  (AMM 27-31-74/401). 
(IPC 27-30-00-16,  centering unit input 
Items 225 and 226).  rod, neutral shift 
linkage, and Mach 
trim actuator 
Check elevator  Loose connections  Replace eight bolts 
output torque tube  in center of output  in output torque 
bolts.  Check for  torque tube where  tube with oversize 
looseness between  inner and outer  bolts to reduce 
output crank and  tubes connect  clearance in the 
outer torque tube.  holes 
(AMM 27-31-74/401). 
Check balance of  Repair and/or  Remove and 
elevator assembly.  repaint not properly  re-balance elevator 
accounted for  assembly. 
weights. balance, adjust  ____NOTE 
Elevator must be 
within balance 
tolerance for 
continued safe 
operation 
(SRM 51-80-04,-05). 
Check for free-play  Jackscrew worn or  Repair or replace. 
in stabilizer jack- defective 
mechanism. screw and hinge  bearings worn or Hinge mechanism or  (AMM 27-41-31/401). Repair or replace 
defective 

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 7)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 05-51-67
 ALL  ú ú 01 Page 211 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H52357
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM  3  ISOLATION PROCEDURE  PROBABLE CAUSE 
 REMEDY 
(Cont) lage. Flaps up. and forward fuse-vibration in aft Moderate vertical  worn holes. for loose bolts or section front spar, stabilizer, center to horizontal jackscrew fitting Check attachment of (Cont) _________________Vibration present  Worn or loose parts  Repair or replace. 
Visual inspection parts of airplane for loose or missing  Loose or missing vortex generators  Procedures Guide, Items 57-30-6). (Dispatch Deviations Repair or replace Section 3, 
ated tail cone Damaged or delamin- Repair or replace. 
inlet door Loose or worn APU  Repair 
seals, etc. fairings, doors, Loose or missing  Repair or replace. 
(Mach > 0.70). airspeed. with decline in ishes or stops Vibration dimin-high airspeed Vibration during  fuselage. tailcone and the surface of the between the mating Check for gaps  If the tailcone was missing. the sealant may be previously removed,  Fillet seal gap (AMM 53-53-0/401). with BMS 5-79 
play in the assembly. and jackscrew izer hinge bearing horizontal stabil-Check for excessive  ings and/or fittings Loose or worn bear- 1 (AMM 27-41-31/401). loose or worn parts Repair or replace 
Procedures Guide, Check aft body vortex generators. Item No. 55-30-1. Section 3, Dispatch Deviations  vortex generators Damaged or missing  S/B 737-53-1032 and vortex generators damaged or loose 737-55-1005. Repair install as given in If not installed, 
(AMM 53-31-21/401). 

Vibration Symptom and Maintenance Action - In-flight Vibration
　
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