500  Vibration Troubleshooting Guide 
May 01/00  Figure 201 (Sheet 4)  5-51-281 
Page 207 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Check Number  CHECKS AND SYMPTONS  INSPECTIONS/TESTS/MAINTENANCE 
106  Elevator Checks (Continued): 6. Check for loose or missing elevator balance panel hinge bolts per MM 27-31-41. 7. Check for separation or deterioration of elevator hinge seal per MM 27-31-171. 8. Check balance of elevator assembly per Structural Repair Manual (SRM) 51-80-04, 05. 
Check Number  CHECKS AND SYMPTONS  INSPECTIONS/TESTS/MAINTENANCE 
106  Reported vibration which is present during high airspeed conditions (Mach>.70). Vibration diminishes or ceases with decline in airspeed.  Horizontal Stabilizer and Tail Checks: 1. Check for gaps between the mating surface of the tailcone and the fuselage. If the tailcone was previously removed, the sealant may be missing. Fill seal gap with BMS 5-79 per MM53-53-0. 2. Check for excessive play in the horizontal stabilizer hinge bearing and jack screw assembly per MM 27-41-31. 3. Check for aft body vortex generators per Dispatch Deviations Procedures Guide, Section 3, Item No. 55-30-1. If not installed, install per Service Bulletin 737-55-1005 and 737-53-1032. Repair damaged or loose vortex generators per MM 53-31-21. 
107  The vibration is categorized as "Dutch Roll" (a phenomena of the empennage rocking from side to side during flight). While in flight, switch yaw damper to "off" for at least 30 seconds and note any change in vibration level.  Do the following succession. Discontinue steps when discrepant component is found. 1. Check and/or replace yaw damper coupler per MM 22-11-141. 2. Replace the rudder PCU Electro-Hydraulic Servo-valve/s (typical IPC 27-20-1-1, Item 401). 3. Check and/or replace the rudder PCU per MM 27-21-91. 

 Vibration Troubleshooting Guide  500 
5-51-281  Figure 201 (Sheet 5)  May 01/00 
Page 208 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

To assist in the resolution of any vibration observed in the flight deck or in the cabin, please complete the following:
Date: Aircraft: Model: 737-T/O Gross Wt
Flight condition at approximate onset: (please check applicable box)

T/O Roll

Climb (<3,000 ft)

Climb
Cruise

Hold

Descent

Landing
Altitude:  Airspeed: Mach: Autopilot: on / off
Eng #1:  % N1  % N2 Eng.#2:  % N1 % N2 Eng.Vib: #1 #2
What event, if any, initiated the vibration?
What event, if any, caused the vibration to stop?
Was the vibration continuous or intermittent? Continuous

Intemittent
How does the vibration start and stop? Starts/stops suddenly

Starts/stops slowly

What is the magnitude of the vibration?
Barely perceptible

Clearly noticeable

Annoying

Uncomfortable
Was the vibration noticeable in the cabin? If yes, where:

What is the characteristics of the vibration: (please check one
Low Frequency: Motion can be felt by the whole body. Motion of sun visors or window heater cable

may be noticeable.
Direction: Mostly Lateral

Mostly Vertical

Vertical and Lateral

High Frequency: Vibration that can be felt tactilely with hands and feet.
Describe the location(s) where the vibration is felt: (i.e. rudder pedal or control column)

If there was noise associated with the vibration, describe the character of the noise. (e.g. moan, drone, buzz, whine, whistle)
Additional description of vibration/noise or other observations:
500  Attachment I 
May 01/00  Flight Deck Vibration Event Log BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  5-51-281 Page 209 

FLIGHT PROCEDURES FOR VIBRATION TROUBLESHOOTING
Please record for each flight:
Flight numberDate Take-off UMT (GMT)    Take-off Weight  Take-off CG Load distribution 
Record for onset of vibAltitude  Mach ration: Speed   Stab Tri m  Rudder Trim  Fuel  Left Center  Right 
Autopilot: Eng #1:  mode:  % N1  airspeed:  % N2  Eng. #2:  climb speed:  % N1  % N2  OAT:Eng. Vib:  A OA: #1  #2 

FOR VIBRATION TROUBLESHOOTING, PLEASE COMPLETE ALL TESTS ONLY AS OPERATIONS ALLOW. ORDER MAY VARY AS REQUIRED TO COMPLETE. WITH DISCRETION, TESTS MAY BE ACCOMPLISHED DURING REVENUE FLIGHT.
TEST (Restore the aircraft to normal flight between each step)  Effect on vibration (circle one) 
　
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