Vibration Symptom and Maintenance Action - In-flight Vibration 
Figure 201 (Sheet 13)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
H52727
A 737-300/400/500MAINTENANCE MANUAL 
PROBLEM  3  ISOLATION PROCEDURE  PROBABLE CAUSE  
 REMEDY  
Vibration felt  Check elevator  Elevator control  Tension cable  
in control  control cable  loop  (AMM 27-09-111/  
column.  tension.  ).  
Vibration starts  
at descent  
betweem 340 and  
270 knots and  
stops between  
240 to 210 knots.  
Vibration may  
reduce when  
throttles are  
retarded. 
High frequency  Check:  
up. May not be noise with flaps vibration and  edge 1. Wing trailing  worn or missing. or damage. Seals Wear, deterioration  and AMM 27-51-39/ (AMM 27-51-11/401) Repair or replace  
heard in all  System out of  401). 
phases of flight.  adjustment 
May vary with  
increased  2. Trailing edge flap  Wear, deterioration  Repair or replace  
airspeed.  Can  track fairing  or damage.  Seals  (AMM 27-51-32/401)  
be heard over  worn or missing.  and AMM 27-51-52/  
the wing or in  System out of  401).  
the passenger  adjustment  
vibration may be Noise and compartment.  3.  louvers Ram air exhaust  out of adjustment or damage. System Wear, deterioration  (AMM 21-52-91/401). Repair or replace  
transmitted to a  
broad area of  4. Ram air inlet door  Wear , deterioration  Repair or replace  
the airframe.  seals  or damage.  Seals  (AMM 21-52-41/401).  
worn or missing  
5.  Ram air inlet  Wear, deterioration  Repair or replace  
deflector door  or damage.  System  (AMM 21-52-21/401,  
out of adjustment  AMM 21-52-31/401).  
6. Main landing gear  Out of adjustment  Repair or replace  
strut and wing  (AMM 32-13-21/401).  
door  
7.  Trailing edge  Delaminating  Repair or replace  
aft flap  (SRM 51-40-6,  
SRM 57-53-02). 
Vibration Symptom and Maintenance Action - In-flight Vibration 
Figure 201 (Sheet 14)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 05-51-67
 ALL  ú ú 01 Page 218 ú Nov 12/99 
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
H57499
A 737-300/400/500MAINTENANCE MANUAL 
PROBLEM  ISOLATION PROCEDURE  PROBABLE CAUSE  REMEDY  
High frequency  Check:  
noise with flaps vibration and  8. Wing-to-body fairing  Sealant missing  (IPC 53-51-00-10, Repair or replace  
up. May not be  Items 10, 130, 185 
heard in all  and 190). 
phases of flight.  
May vary with  9. Ground service  Discrepant  Repair or replace  
 
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