Pilot of a fokker 100 rejected takeoff at 70 KTS due to severe nose gear vibration.

Attributes
ACN	383536
Time
Date	199710
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : clt
State Reference	NC
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	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : cfi pilot : private pilot : instrument
Experience	flight time last 90 days : 160 flight time total : 13000 flight time type : 2500
ASRS Report	383536
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical conflict : ground critical other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After starting our initial takeoff roll, a heavy vibration was noticed coming from the nose gear. It subsided slightly and then became a severe vibration. The captain was flying and he called 'reject' at about 70 KTS. I called the reject to the tower and we taxied clear of the runway. The passenger and flight attendants were informed to remain seated and we taxied back to the gate. The vibration was so strong, the #2 IRS dropped out of alignment and the first officer's primary flight display and navigation display dropped off as well. This was a little different because the first officer's side displayed no airspeed or heading guidance. However, due to our annual CRM and semi-annual simulator training, we both knew what was expected of each of us and the training made it more instinctive. Callback conversation with reporter revealed the following information: the reporter states the corrective action as reported by maintenance was a nose strut found oversvced, nosewheel and tire replaced and the torque links tightened. Reporter advises in 4 yrs of flying the FK100 a vibration of this magnitude was never experienced.

Original NASA ASRS Text

Title: PLT OF A FOKKER 100 REJECTED TKOF AT 70 KTS DUE TO SEVERE NOSE GEAR VIBRATION.

Narrative: AFTER STARTING OUR INITIAL TKOF ROLL, A HVY VIBRATION WAS NOTICED COMING FROM THE NOSE GEAR. IT SUBSIDED SLIGHTLY AND THEN BECAME A SEVERE VIBRATION. THE CAPT WAS FLYING AND HE CALLED 'REJECT' AT ABOUT 70 KTS. I CALLED THE REJECT TO THE TWR AND WE TAXIED CLR OF THE RWY. THE PAX AND FLT ATTENDANTS WERE INFORMED TO REMAIN SEATED AND WE TAXIED BACK TO THE GATE. THE VIBRATION WAS SO STRONG, THE #2 IRS DROPPED OUT OF ALIGNMENT AND THE FO'S PRIMARY FLT DISPLAY AND NAV DISPLAY DROPPED OFF AS WELL. THIS WAS A LITTLE DIFFERENT BECAUSE THE FO'S SIDE DISPLAYED NO AIRSPD OR HDG GUIDANCE. HOWEVER, DUE TO OUR ANNUAL CRM AND SEMI-ANNUAL SIMULATOR TRAINING, WE BOTH KNEW WHAT WAS EXPECTED OF EACH OF US AND THE TRAINING MADE IT MORE INSTINCTIVE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATES THE CORRECTIVE ACTION AS RPTED BY MAINT WAS A NOSE STRUT FOUND OVERSVCED, NOSEWHEEL AND TIRE REPLACED AND THE TORQUE LINKS TIGHTENED. RPTR ADVISES IN 4 YRS OF FLYING THE FK100 A VIBRATION OF THIS MAGNITUDE WAS NEVER EXPERIENCED.

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.