Flight crew of medium large transport aborts takeoff upon experiencing engine vibration. Subsequent investigation reveals that tire failure caused a portion of the gear door to separate from the aircraft, and that portion was ingested by the engine causing critical engine damage.

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Attributes
ACN	117298
Time
Date	198907
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : cle
State Reference	OH
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	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : takeoff ground other : taxi other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	other other : other pilot : atp pilot : cfi
Experience	flight time last 90 days : 180 flight time total : 10500 flight time type : 1050
ASRS Report	117298
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 96 flight time total : 8800 flight time type : 1230
ASRS Report	117299
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : rejected takeoff
Consequence	other Other
Supplementary
Primary Problem	Aircraft

Narrative:

This incident occurred on an air carrier flight from cleveland to san francisco, during the takeoff phase. After having received clearance for takeoff, the captain (PF) taxied into position on runway and used autothrottle system to set power. Approximately 3 to 4 seconds after maximum power was set, aircraft at approximately 70 KTS and all engine parameters were nominal, a vibration was felt coming from left side of aircraft. Captain aborted takeoff and taxied clear of runway. Once on taxiway the left engine appeared to have slightly higher than normal vibration and was shutdown. Aircraft taxied in without any further problem. At gate, we observed foreign object damage to engine fan blades, cowl, left side fuselage, in addition to tread separation on left tire and missing gear door. We speculate that while taxiing onto runway, tire tread separated and caused a piece of gear door to lodge in engine just forward of fan blades. A piece of gear door was removed from fan blade area by maintenance personnel.

Original NASA ASRS Text

Title: FLT CREW OF MLG ABORTS TKOF UPON EXPERIENCING ENGINE VIBRATION. SUBSEQUENT INVESTIGATION REVEALS THAT TIRE FAILURE CAUSED A PORTION OF THE GEAR DOOR TO SEPARATE FROM THE ACFT, AND THAT PORTION WAS INGESTED BY THE ENGINE CAUSING CRITICAL ENGINE DAMAGE.

Narrative: THIS INCIDENT OCCURRED ON AN AIR CARRIER FLT FROM CLEVELAND TO SAN FRANCISCO, DURING THE TKOF PHASE. AFTER HAVING RECEIVED CLRNC FOR TKOF, THE CAPT (PF) TAXIED INTO POSITION ON RWY AND USED AUTOTHROTTLE SYSTEM TO SET POWER. APPROX 3 TO 4 SECONDS AFTER MAX POWER WAS SET, ACFT AT APPROX 70 KTS AND ALL ENGINE PARAMETERS WERE NOMINAL, A VIBRATION WAS FELT COMING FROM LEFT SIDE OF ACFT. CAPT ABORTED TKOF AND TAXIED CLEAR OF RWY. ONCE ON TXWY THE LEFT ENGINE APPEARED TO HAVE SLIGHTLY HIGHER THAN NORMAL VIBRATION AND WAS SHUTDOWN. ACFT TAXIED IN WITHOUT ANY FURTHER PROBLEM. AT GATE, WE OBSERVED FOREIGN OBJECT DAMAGE TO ENGINE FAN BLADES, COWL, LEFT SIDE FUSELAGE, IN ADDITION TO TREAD SEPARATION ON LEFT TIRE AND MISSING GEAR DOOR. WE SPECULATE THAT WHILE TAXIING ONTO RWY, TIRE TREAD SEPARATED AND CAUSED A PIECE OF GEAR DOOR TO LODGE IN ENGINE JUST FORWARD OF FAN BLADES. A PIECE OF GEAR DOOR WAS REMOVED FROM FAN BLADE AREA BY MAINT PERSONNEL.

Data retrieved from NASA's ASRS site as of August 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.