MD80 crew departing mmsd reports extreme nosewheel vibration and rejects takeoff.

Attributes
ACN	708007
Time
Date	200608
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mmsd.airport
State Reference	FO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	708007
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : rejected takeoff
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

During takeoff roll; just after calling for 'autothrottles on' the aircraft started an extreme and almost violent shimmy/vibration. I announced and aborted immediately. I used reverse with good engine response and braking was smooth and even but the severe vibration continued until the aircraft was almost stopped. Slow taxi was without vibration. We returned to the ramp. Maintenance checked nose tire pressure good and no apparent scuffs flat-spots or visible damage. Both nose tires were changed. The subsequent two legs were completely normal as related to the nose tires. I know this abort speed was below 60 KTS so perhaps does not need to be written up...by the book; but the vibration was so severe and harsh I thought it worthwhile to report.

Original NASA ASRS Text

Title: MD80 CREW DEPARTING MMSD RPTS EXTREME NOSEWHEEL VIBRATION AND REJECTS TKOF.

Narrative: DURING TKOF ROLL; JUST AFTER CALLING FOR 'AUTOTHROTTLES ON' THE ACFT STARTED AN EXTREME AND ALMOST VIOLENT SHIMMY/VIBRATION. I ANNOUNCED AND ABORTED IMMEDIATELY. I USED REVERSE WITH GOOD ENG RESPONSE AND BRAKING WAS SMOOTH AND EVEN BUT THE SEVERE VIBRATION CONTINUED UNTIL THE ACFT WAS ALMOST STOPPED. SLOW TAXI WAS WITHOUT VIBRATION. WE RETURNED TO THE RAMP. MAINT CHKED NOSE TIRE PRESSURE GOOD AND NO APPARENT SCUFFS FLAT-SPOTS OR VISIBLE DAMAGE. BOTH NOSE TIRES WERE CHANGED. THE SUBSEQUENT TWO LEGS WERE COMPLETELY NORMAL AS RELATED TO THE NOSE TIRES. I KNOW THIS ABORT SPD WAS BELOW 60 KTS SO PERHAPS DOES NOT NEED TO BE WRITTEN UP...BY THE BOOK; BUT THE VIBRATION WAS SO SEVERE AND HARSH I THOUGHT IT WORTHWHILE TO RPT.

Data retrieved from NASA's ASRS site as of January 2009 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.