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with the wing  high speed buffet 
leading edge when  characteristics. 
the leading edge 
devices are 
retracted. 
4. Spoiler panel to  Wear or deteriora- Repair or replace 
flap seals  tion  (AMM 27-61-11/401). 
5. Captain's and  Readings inaccurate;  Repair or replace 
first officer's  instrument error  (AMM 34-12-01/401). 
airspeed/mach 
and altimeter 
readings 
6. Captain's and  Readings inaccurate;  Do the full range 
first officer's  system leakage  leakage ground test 
pitot-static  (AMM 34-11-01/401). 
system 
7. Verify proper  Pitot-static probes  Repair or replace 
pitot-static  missing or mounted  (IPC 34-11-11-01, 
probes are  incorrectly.  Item 25). 
installed in 
four places. 

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 13)

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 05-51-67
 ALL  ú ú 01 Page 217 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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)

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 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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