B737-800 crew had right nose tire tread separation departing cos.

Attributes
ACN	584629
Time
Date	200306
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cos.airport
State Reference	CO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 80 flight time total : 8000 flight time type : 4000
ASRS Report	584629
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other flight crewb other other : 5
Resolutory Action	controller : provided flight assist flight crew : declared emergency flight crew : landed in emergency condition none taken : anomaly accepted
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Approximately 10 KTS below V1 on takeoff roll at cos, experienced rumble and vibration similar to nosewheel shimmy. Rumble and vibration stopped prior to V1. Captain elected to continue takeoff. Cos confirmed rubber on runway and maintenance indicated it was most likely a nosewheel tire. Flight continued to atl with coordination between crew and dispatcher. Captain elected to fly the approach and landing. Emergency was declared. Land and rollout was uneventful. Cleared runway, maintenance inspected nosewheel and cleared aircraft to taxi to the gate. At gate discovered right nosewheel tire tread had separated, tire was still inflated. Also, aircraft suffered damage to nose gear sensors, large dent to underbelly and ingestion of rubber into both engines, with fan damage noted on #2 engine. No abnormal engine indications were noted during flight.

Original NASA ASRS Text

Title: B737-800 CREW HAD R NOSE TIRE TREAD SEPARATION DEPARTING COS.

Narrative: APPROX 10 KTS BELOW V1 ON TKOF ROLL AT COS, EXPERIENCED RUMBLE AND VIBRATION SIMILAR TO NOSEWHEEL SHIMMY. RUMBLE AND VIBRATION STOPPED PRIOR TO V1. CAPT ELECTED TO CONTINUE TKOF. COS CONFIRMED RUBBER ON RWY AND MAINT INDICATED IT WAS MOST LIKELY A NOSEWHEEL TIRE. FLT CONTINUED TO ATL WITH COORD BTWN CREW AND DISPATCHER. CAPT ELECTED TO FLY THE APCH AND LNDG. EMER WAS DECLARED. LAND AND ROLLOUT WAS UNEVENTFUL. CLRED RWY, MAINT INSPECTED NOSEWHEEL AND CLRED ACFT TO TAXI TO THE GATE. AT GATE DISCOVERED R NOSEWHEEL TIRE TREAD HAD SEPARATED, TIRE WAS STILL INFLATED. ALSO, ACFT SUFFERED DAMAGE TO NOSE GEAR SENSORS, LARGE DENT TO UNDERBELLY AND INGESTION OF RUBBER INTO BOTH ENGS, WITH FAN DAMAGE NOTED ON #2 ENG. NO ABNORMAL ENG INDICATIONS WERE NOTED DURING FLT.

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.