Test flight loses control account heavy vibration.

Attributes
ACN	166182
Time
Date	199012
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sju
State Reference	PR
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, High Wing, 2 Turboprop Eng
Flight Phase	landing other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 2270 flight time type : 1200
ASRS Report	166182
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable
Consequence	faa : investigated other
Supplementary
Primary Problem	Aircraft

Narrative:

The test flight was due to a vibration reported on the left main strut. After the takeoff we found out that the vibration was persisting on the aircraft south we made the decision to stay in the pattern and land on runway 8 to execute another takeoff and find out if the vibration was north the left side just to be sure. The incident was on the landing just about to T/D. The beta (right) light comes on during the flare. Preceeding that, a violent saw to the right plus/minus 40 and sinking. The captain was flying and as a helping action, I apply aircraft left rudder, and after that we hit the runway with the right wing going out of control and off the runway.

Original NASA ASRS Text

Title: TEST FLT LOSES CONTROL ACCOUNT HEAVY VIBRATION.

Narrative: THE TEST FLT WAS DUE TO A VIBRATION RPTED ON THE L MAIN STRUT. AFTER THE TKOF WE FOUND OUT THAT THE VIBRATION WAS PERSISTING ON THE ACFT S WE MADE THE DECISION TO STAY IN THE PATTERN AND LAND ON RWY 8 TO EXECUTE ANOTHER TKOF AND FIND OUT IF THE VIBRATION WAS N THE L SIDE JUST TO BE SURE. THE INCIDENT WAS ON THE LNDG JUST ABOUT TO T/D. THE BETA (R) LIGHT COMES ON DURING THE FLARE. PRECEEDING THAT, A VIOLENT SAW TO THE R PLUS/MINUS 40 AND SINKING. THE CAPT WAS FLYING AND AS A HELPING ACTION, I APPLY ACFT L RUDDER, AND AFTER THAT WE HIT THE RWY WITH THE R WING GOING OUT OF CTL AND OFF THE RWY.

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.