Flight crew experiences yaw damper vibration.

Attributes
ACN	317373
Time
Date	199509
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : jan
State Reference	MS
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 190 flight time total : 11500 flight time type : 1808
ASRS Report	317373
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During climb out, airframe vibration began passing 10000 ft AGL. All cockpit indications normal. As vibration continued it increased in severity. Turned off yaw damper switch and vibration ceased. Once established in cruise turned yaw damper switch back on and vibration began again. Stopped when 'off' was reselected. Continued to destination with yaw damper switch in off position. No further problems. Recorded in logbook. Callback conversation with reporter revealed the following information: the reporter stated he was flying a boeing 737-200. He experienced the yaw damper vibration on this very same airplane in jun of 93. He has never found out what maintenance did to fix the problem.

Original NASA ASRS Text

Title: FLC EXPERIENCES YAW DAMPER VIBRATION.

Narrative: DURING CLBOUT, AIRFRAME VIBRATION BEGAN PASSING 10000 FT AGL. ALL COCKPIT INDICATIONS NORMAL. AS VIBRATION CONTINUED IT INCREASED IN SEVERITY. TURNED OFF YAW DAMPER SWITCH AND VIBRATION CEASED. ONCE ESTABLISHED IN CRUISE TURNED YAW DAMPER SWITCH BACK ON AND VIBRATION BEGAN AGAIN. STOPPED WHEN 'OFF' WAS RESELECTED. CONTINUED TO DEST WITH YAW DAMPER SWITCH IN OFF POS. NO FURTHER PROBS. RECORDED IN LOGBOOK. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED HE WAS FLYING A BOEING 737-200. HE EXPERIENCED THE YAW DAMPER VIBRATION ON THIS VERY SAME AIRPLANE IN JUN OF 93. HE HAS NEVER FOUND OUT WHAT MAINT DID TO FIX THE PROB.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.