Flight crew of A300 experiences significant vibration after takeoff indicative of possible tire failure. Divert to another airport; declare emergency and land. Discover large flat spot on main gear tire.

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Attributes
ACN	649450
Time
Date	200503
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 10500 flight time type : 3000
ASRS Report	649450
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : diverted to another airport flight crew : declared emergency flight crew : landed as precaution
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Departing ZZZ1; felt strong vibration at rotation which resembled a blown tire. Delayed gear retraction in which the vibration decreased; so I retracted the gear. I discussed the situation with the first officer and we both agreed that it could be a deflated or blown tire; so I opted to declare an emergency and land in ZZZ2. The landing was a non event. Maintenance found #2 main tire had a huge flat spot.

Original NASA ASRS Text

Title: FLT CREW OF A300 EXPERIENCES SIGNIFICANT VIBRATION AFTER TKOF INDICATIVE OF POSSIBLE TIRE FAILURE. DIVERT TO ANOTHER ARPT; DECLARE EMER AND LAND. DISCOVER LARGE FLAT SPOT ON MAIN GEAR TIRE.

Narrative: DEPARTING ZZZ1; FELT STRONG VIBRATION AT ROTATION WHICH RESEMBLED A BLOWN TIRE. DELAYED GEAR RETRACTION IN WHICH THE VIBRATION DECREASED; SO I RETRACTED THE GEAR. I DISCUSSED THE SIT WITH THE FO AND WE BOTH AGREED THAT IT COULD BE A DEFLATED OR BLOWN TIRE; SO I OPTED TO DECLARE AN EMER AND LAND IN ZZZ2. THE LNDG WAS A NON EVENT. MAINT FOUND #2 MAIN TIRE HAD A HUGE FLAT SPOT.

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.