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1) Disengage autopilot and retrim (as required) without changing speed or thrust. Re-engage autopilot.  No Change Decrease Increase Stopped 
2) Turn yaw damper off.  No Change Decrease Increase Stopped 
3a) Gradually increase speed without changing thrust until vibration changes.  No Change Decrease Increase Stopped 
3b) Gradually decrease speed without changing thrust until vibration changes.  No Change Decrease Increase Stopped 
Gradually increase/decrease engine 1 speed without changing airspeed until vibration changes or until thrust has been increased/decreased by 10% N1. 4a) Indicated Engine Vibration =  #1 #2  No Change Decrease Increase Stopped 
Restore engine 1 to original N1 setting. 4b) Indicated Engine Vibration =  #1 #2  No Change Decrease Increase Stopped 
Gradually increase/decrease engine 2 speed without changing airspeed until vibration changes or until thrust has been increased/decreased by 10% N1. 5a) Indicated Engine Vibration =  #1 #2  No Change Decrease Increase Stopped 

 Attachment II  500 
5-51-281  Flight Procedures for Vibration Troubleshooting  May 01/00 
Page 210  (Sheet 1) 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

 

TEST (Restore the aircraft to normal flight between each step)  Effect on vibration (circle one) 
Restore engine 2 to original N1 setting. 5b) Indicated Engine Vibration =  #1 #2  No Change Decrease Increase Stopped 
Input right rudder trim. Maintain heading with wheel. 6a) Trim Change =   Units  No Change Decrease Increase Stopped 
6b) Return to hands-off trim.  No Change Decrease Increase Stopped 
Input left rudder trim. Maintain heading with wheel. 7a) Trim Change =   Units  No Change Decrease Increase Stopped 
7b) Restore engine 1 to original N1 setting.  No Change Decrease Increase Stopped 
Mis-trim stabilizer airplane nose down while pulling on column to maintain 1G flight. Continue mis-trimming until vibration changes or approximately 20 lbs column pull is required. 8a) Trim Change =   Units  No Change Decrease Increase Stopped 
8b) Return to hands-off trim.  No Change Decrease Increase Stopped 
Mis-trim stabilizer airplane nose down while pulling on column to maintain 1G flight. Continue mis-trimming until vibration changes or approximately 20 lbs column pull is required. 9a) Trim Change =   Units  No Change Decrease Increase Stopped 
9b) Return to hands-off trim  No Change Decrease Increase Stopped 
10a) Using the control wheel, input small left aileron.  No Change Decrease Increase Stopped 
10b) Using the control wheel, input small left aileron.  No Change Decrease Increase Stopped 
11) Turn hydraulic system "A" off.  No Change Decrease Increase Stopped 
12) Turn hydraulic system "B" off.  No Change Decrease Increase Stopped 
23) Turn air conditioning pack off.  No Change Decrease Increase Stopped 

500  Attachment II 
May 01/00  Flight Procedures for Vibration Troubleshooting  5-51-281 
(Sheet 2)  Page 211 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

 

TEST (Restore the aircraft to normal flight between each step)  Effect on vibration (circle one) 
24) Turn bleed air valve off.  No Change Decrease Increase Stopped 
25) Turn electrical generator 1 off. (Keep APU generator on line)  No Change Decrease Increase Stopped 
26) Turn electrical generator 1 off. (Keep APU generator on line)  No Change Decrease Increase Stopped 
27) Cycle landing gear selector handle to up, pause and return handle to off.  No Change Decrease Increase Stopped 
28) Cycle speed brakes. (Observe operational restrictions.)  No Change Decrease Increase Stopped 

In addition to the above information, please comment on the following questions: 1) Is the vibration vertical or lateral?
2)  In what section of the fuselage is the vibration most noticeable? 
3)  What is the approximate frequency and intensity of the vibration? 
4)  At what trailing edge flap setting does the vibration occur? 
5)  Is the vibration continuous after initiation or does it dampen with time? 

Additional comments: OVERWEIGHT LANDING - MAINTENANCE PRACTICES (CONDITIONAL INSPECTION)
 Attachment II  500 
5-51-281 Page 212  Flight Procedures for Vibration Troubleshooting (Sheet 3) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/00 
　
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