500  Vibration Troubleshooting Guide 
May 01/00  Figure 201 (Sheet 2)  5-51-281 
Page 205 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

LEVEL II - INSPECTIONS AND TESTS LEVEL II - INSPECTIONS AND TESTS LEVEL II - INSPECTIONS AND TESTS FLIGHT DECK VIBRATION EVENT LOG
Check Number  CHECKS AND SYMPTONS  INSPECTIONS/TESTS/MAINTENANCE 
100  Reported high frequency vibration manifested by sound when flaps are extended. Vibration may be heard over the wing  Do the following: 1. Vertical play in the trailing edge flap assembly foreflap caused by wear of the foreflap sequencing carriage bearings per MM 27-51-41/600 and MM 27-51-111/600. 2. Loose attachment bolts on the hinged flap carriage rollers per MM 27-51-51. 3. Play in the trailing edge inboard flap aft segment caused by wear or deterioration of the aft segment actuation mechanism cam roller bearing. The bearing is located on the inboard end of the midflap segment (typical IPC 57-53-2-14A. Item 85). 4. Adjustment of the upper wing trailing edge panels (typical IPC  57-30-0-15) per MM 27-51-72/500. 5. Separation or deterioration of the foreflap/spoiler interface blade seal per MM 27-61-11, figure 401. 6. Loose leading edge slat actuator access panel (typical IPC  57-30-0-45). 7. Trailing edge aft flap for delamination per Structural Repair Manual (SRM) 51-40-6. 8. Inboard aft flap drive mechanism (typical IPC 57-53-02-14A, Items 85, 86, 225 and 230). 9. Inboard midflap seal plate (elephant ear) per MM 27-51-341 (misadjusted seal plate may cause a humming noise that can be heard at seats just aft of wing). 10. Remove/Replace left or right pack turbofan (typical IPC 21-50-0-14, Item 260) 
102  Reported high frequency vibration manifested by sound when flaps are up. The vibration may or may not be heard during all phases of flight. Vibration might be heard over the wing or in the passenger compartment.  Do the following general checks and adjustments: 1. Wing trailing edge per MM 27-51-12 and 27-51-72. 2. Trailing edge flap track fairing per MM 27-51-121. 3. Ram air exhaust louvers per MM 21-52-91. 4. Ram air inlet door seals per MM 21-52-41. 5. Main landing gear wing door per MM 32-13-21. 6. Trailing edge aft flap for delamination per Structural Repair Manual (SRM) 51-40-6. 7. Missing sealant at the wing-to-body fairing (typical IPC 53-50-0-10, Item 10). 8. Discrepant ground service swing check valve (typical IPC 21-20-0-42, Item 90, MM 21-21-11). 9. Air distribution duct per MM 21-21-0 through 21-24-0. 10. Ram air inlet deflector door adjustment per MM 21-52-21 through MM 21-52-31. 11. Check for freeplay in aileron tab per MM 27-09-600. 12. Check for worn tab control rod bearings per MM 27-11-151. 13. Check aileron hinges for wear per MM 27-11-11 14. Check aileron cable tension per MM 27-11-0/500. 15. Check for loose or worn balance panel hinges, hinge fittings, and/or bolts per MM 27-11-31. 

 Vibration Troubleshooting Guide  500 
5-51-281  Figure 201 (Sheet 3)  May 01/00 
Page 206 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Check Number  CHECKS AND SYMPTONS  INSPECTIONS/TESTS/MAINTENANCE 
103  Reported high frequency vibration manifested by sound when flaps are up. The vibration may or may not be heard during all phases of flight. Vibration might be heard in the crew compartment.  Do the following general check and adjustments: 1. Nose landing gear doors per MM 32-22-11. 2. Lower fuselage doors, access panels and hatches located in the vicinity of the crew compartment. 
104  Vibration is reported as hydraulic system related. One beat per second knocking sound during climb.  Hydraulic reservoir 'A' not holding pressure, or hydraulic reservoir head pressure in reservoir 'A' is more than 55 psi. Remove and replace air pressure regulator (typical IPC 29-14-00-10, Item 140). 
105  Vibration is reported as engine related.  Do the following: 1. Check engine mount for tightness per MM 51-41-0, 54-41-11, and 71-20-0. 2. Adjust the P&D valve per MM 73-21-1. (Reference P&WA JT8D Maintenance Manual) 3. Remove and replace the fuel control per MM 73-21-01. (Reference P&WA JT8D Maintenance Manual) 
106  Reported vibration which can be constant during all phases of flight and may be felt in both the crew compartment and aft empennage.  Rudder Checks: 1. Check rudder freeplay per MM 27-09-600. 2. Remove and replace worn components per MM 27-21-11 and  27-21-91. Elevator Tab Checks: 1. Check elevator tab freeplay per MM 27-09-600. 2. Inspect elevator tab lock linkage and pushrods per MM 27-31-121. Inspect for missing tab lock linkage bolts. 3. Inspect elevator tab hinge fitting bolts and bearings per MM 27-31-31. 4. Inspect outboard elevator control tab hinge fittings for looseness per S/B 737-55-1040 and 737-SL-55-9-A. Elevator Checks: 1. Check elevator freeplay per MM 27-09-600 2. Check for loose or worn output torque tube crank control pushrod or elevator mast fitting per MM 27-31-191. 3. Check elevator hinge fittings per S/B 737-55-1054 and for worn bearings. A check of the hinges may be accomplished by placing the elevator in the neutral position and applying a "shake" force at the hinge positions. 4. Check for loose or worn elevator output torque tube bolts which attach the inner and outer torque tubes per MM 27-31-191 and S/B 737-27-1057. 5. Check for worn bushings at the outboard end of torque tube (Typical IPC 27-30-00-16, Item 225 and 226). 
　
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