Narrative:

During climb and cruise we received continuous light airframe vibration. The vibration would increase and decrease in intensity, but was nearly always continuous. Each time the intensity increased, we pressed the event record button on the digital flight data recorder. The vibration seemed to be continuous at the heavier weights and was not noticeable at the lighter weights. It seemed to be centered from the wings aft, either in the aft body or the tail. Vibration was very noticeable to passenger and crew. I think this could be a serious safety problem (potentially) if this is allowed to continue. I flew this aircraft in may and landed short of our destination due to moderate to severe airframe vibration. (I filed a report then, too.) I can personally document 10 separate write-ups on airframe vibrations for this aircraft (2 by me). Copies of the write- ups and signoffs are available. I think weight may be a factor. I have flown this aircraft at lighter weights with no problems. Maintenance usually cannot duplicate because test flts are at lower weights. Light turbulence sometimes starts the vibrations. In my 2 vibration instances with this aircraft, maintenance did not pull the digital flight data recorder.

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Original NASA ASRS Text

Title: AIRFRAME VIBRATION DURING CLB AND CRUISE.

Narrative: DURING CLB AND CRUISE WE RECEIVED CONTINUOUS LIGHT AIRFRAME VIBRATION. THE VIBRATION WOULD INCREASE AND DECREASE IN INTENSITY, BUT WAS NEARLY ALWAYS CONTINUOUS. EACH TIME THE INTENSITY INCREASED, WE PRESSED THE EVENT RECORD BUTTON ON THE DIGITAL FLT DATA RECORDER. THE VIBRATION SEEMED TO BE CONTINUOUS AT THE HEAVIER WTS AND WAS NOT NOTICEABLE AT THE LIGHTER WTS. IT SEEMED TO BE CTRED FROM THE WINGS AFT, EITHER IN THE AFT BODY OR THE TAIL. VIBRATION WAS VERY NOTICEABLE TO PAX AND CREW. I THINK THIS COULD BE A SERIOUS SAFETY PROB (POTENTIALLY) IF THIS IS ALLOWED TO CONTINUE. I FLEW THIS ACFT IN MAY AND LANDED SHORT OF OUR DEST DUE TO MODERATE TO SEVERE AIRFRAME VIBRATION. (I FILED A RPT THEN, TOO.) I CAN PERSONALLY DOCUMENT 10 SEPARATE WRITE-UPS ON AIRFRAME VIBRATIONS FOR THIS ACFT (2 BY ME). COPIES OF THE WRITE- UPS AND SIGNOFFS ARE AVAILABLE. I THINK WT MAY BE A FACTOR. I HAVE FLOWN THIS ACFT AT LIGHTER WTS WITH NO PROBS. MAINT USUALLY CANNOT DUPLICATE BECAUSE TEST FLTS ARE AT LOWER WTS. LIGHT TURB SOMETIMES STARTS THE VIBRATIONS. IN MY 2 VIBRATION INSTANCES WITH THIS ACFT, MAINT DID NOT PULL THE DIGITAL FLT DATA RECORDER.

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.