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 - Unpublished Work - See title page for details.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 - Unpublished Work - See title page for details.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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