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panels slat actuator access Loose leading edge  through -65D). (IPC 57-30-0-65 Repair panels 
edge on aft flap defective trailing Delaminated or  (SRM 51-40-6). Repair or replace 
blade seal ive foreflap/spoiler Separated or defect- (AMM 27-61-11/401). Repair or replace 
Check pack turbofans.  pack turbofan Faulty left or right  pack turbofan. Repair or replace 
just aft of wing heard at seats Humming noise  Mis-adjusted or (Elephant ear). midflap seal plate defective inboard  (AMM 27-51-29/401). Repair or replace 
"Dutch Roll" flight. to-side during rocks from side-type. Empennage mined to be Vibration deter- hydraulics off. "A" and "B" system eliminated with both Vibration reduced or at least 30 seconds. damper "off" for eliminated with yaw Vibration reduced or  valve(s). Hydraulic servo rudder PCU Electro-Worn or defective yaw rate gyro Loose or defective Defective yaw damper coupler.  (AMM 22-11-31/401). yaw damper coupler Repair or replace 
rudder PCU Worn or defective  (AMM 27-21-91/401). Repair or replace 

 

 

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 11)

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 05-51-67
 ALL  ú ú 01 Page 215 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H52715
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM  3  ISOLATION PROCEDURE  PROBABLE CAUSE 
 REMEDY 
speed. increases with Vibration nose gear area. from main or takeoff roll Vibration during  Uneven tire wear/ Tire out-of-round  Wheel/Tire Imbalance  Replace affected AMM 32-45-02/401). (AMM 32-45-01/401, tires and wheels 
the ground gear lifts off Vibration when  weights Missing wheel balance  Wheel Imbalance  CMM). weights (Supplier Replace balance 
Vibration during felt in the wing heard and/or Vibration can be approach when takeoff or root area. extended. flaps are  2. Play in the trailing edge aft segment inboard flap rollers Check: 1. Attachment bolts flap carriage on the hinged  of the midflap on the inboard end bearing is located bearing. The mechanism cam roller segment actuation tion of the aft Wear or deteriora- Item 95). (IPC 27-51-19-02, Replace bearing Torque attachment (AMM 27-51-47/401). bolts 
segment. 
interface blade 3. Foreflap/spoiler seal  deterioration Separation or  (AMM 27-61-11/401, Fig. 401). Repair or replace 
drive machanism 4. Inboard aft flap  tion Wear or deteriora- Repair or replace. 
actuator access 5. Leading edge slat panel.  Loose panel  through -65D). (IPC 57-30-00-65 Repair or replace 

Vibration Symptom and Maintenance Action - In-flight Vibration
Figure 201 (Sheet 12)

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 ALL  ú ú 01 Page 216 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H52719
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM  3  ISOLATION PROCEDURE  PROBABLE CAUSE 
 REMEDY 
Airplane  Check: 
"buffeting"  1. Body/wing/tail  Condition of the  Repair or replace 
for excessive or  leading edges have a  (SRM 57-41-01). 
large dents/  significant effect 
patches/bulges.  on high speed buffet 
Pay particular  characteristics. 
attention to  Leading edge devices 
leading edge  should be undamaged 
devices.  and free of patches 
or dents. 
2. Wing vortex  Vortex generators  Repair or replace 
generators for  damaged or missing.  (Dispatch Deviations 
damage and proper  Procedures Guide, 
position  Section 3, Item No. 
57-30-6). 
3. Leading edge  Flap/slat fairing.  Adjust flaps and/or 
flaps and slats.  Mismatch of slat  slats 
Pay particular  upper trailing edge  (AMM 27-81-0/401). 
attention to the  has significant 
fair of the slat  effect on airplane 
　
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