After touchdown, a DC9 flight crew experienced a severe vibration and the aircraft swerved to the right. The PF maintained directional control and as the aircraft wing began to lower he used opposite control force to keep the wing off the ground. Aircraft was evacuate/evacuationed on the runway after it was stopped.

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Attributes
ACN	327296
Time
Date	199602
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bna
State Reference	TN
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 260 flight time total : 3161
ASRS Report	327296
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 5700 flight time type : 1000
ASRS Report	327428
Events
Anomaly	aircraft equipment problem : critical non adherence other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem other
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Immediately (2 to 3 seconds) after touchdown on runway 31 at bna, I felt a severe vibration. The aircraft began to swerve to the right, and vibration became worse. Vibration had stopped and the wing began to lower to the runway. I (first officer) kept directional control and kept the wing off of the ground with left aileron. The cockpit crew stopped the aircraft on the runway, we did an orderly evacuate/evacuation of the aircraft. Once outside the aircraft I saw that the right main gear was missing from the aircraft. I don't know what caused the gear to separate, nor do I know any corrective action. First officer was flying the aircraft and descent, approach, and landing were all normal and uneventful. Supplemental information from acn 327428: on landing aircraft had structural failure of starboard main mount and subsequently sheared from aircraft. Came to rest just to the right of centerline.

Original NASA ASRS Text

Title: AFTER TOUCHDOWN, A DC9 FLC EXPERIENCED A SEVERE VIBRATION AND THE ACFT SWERVED TO THE R. THE PF MAINTAINED DIRECTIONAL CTL AND AS THE ACFT WING BEGAN TO LOWER HE USED OPPOSITE CTL FORCE TO KEEP THE WING OFF THE GND. ACFT WAS EVACED ON THE RWY AFTER IT WAS STOPPED.

Narrative: IMMEDIATELY (2 TO 3 SECONDS) AFTER TOUCHDOWN ON RWY 31 AT BNA, I FELT A SEVERE VIBRATION. THE ACFT BEGAN TO SWERVE TO THE R, AND VIBRATION BECAME WORSE. VIBRATION HAD STOPPED AND THE WING BEGAN TO LOWER TO THE RWY. I (FO) KEPT DIRECTIONAL CTL AND KEPT THE WING OFF OF THE GND WITH L AILERON. THE COCKPIT CREW STOPPED THE ACFT ON THE RWY, WE DID AN ORDERLY EVAC OF THE ACFT. ONCE OUTSIDE THE ACFT I SAW THAT THE R MAIN GEAR WAS MISSING FROM THE ACFT. I DON'T KNOW WHAT CAUSED THE GEAR TO SEPARATE, NOR DO I KNOW ANY CORRECTIVE ACTION. FO WAS FLYING THE ACFT AND DSCNT, APCH, AND LNDG WERE ALL NORMAL AND UNEVENTFUL. SUPPLEMENTAL INFO FROM ACN 327428: ON LNDG ACFT HAD STRUCTURAL FAILURE OF STARBOARD MAIN MOUNT AND SUBSEQUENTLY SHEARED FROM ACFT. CAME TO REST JUST TO THE R OF CENTERLINE.

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.