Air carrier medium large transport engine problem after takeoff from tol.

Attributes
ACN	192727
Time
Date	199110
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : tol
State Reference	OH
Altitude	agl bound lower : 20 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : tol
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : initial climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 170 flight time total : 12000 flight time type : 3800
ASRS Report	192727
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	other
Supplementary
Primary Problem	Aircraft

Narrative:

Just after liftoff we experienced a severe vibration followed by a partial loss of power on the left engine. Engine EPR dropped from 1.95 to 1.5, N1 dropped to 70 percent and egt was climbing through 600 degree, oil pressure and temperature were normal. After pulling the throttle to idle the vibration diminished and engine parameters returned to normal. I elected to leave engine at idle. An emergency was declared and we returned to land. After completion of all appropriate checklists we landed without further incidence and the emergency was terminated. After parking I inspected the engine and found oil leaking profusely from the aft section. The inlet had no apparent damage. The inlet guide vanes and fan blades showed only normal wear. However, inspection of the aft section showed extensive damage. The turbine blades and guide vanes were severely burnt with some obvious twisting. The turbine blades were approximately 30-40 percent gone.

Original NASA ASRS Text

Title: ACR MLG ENG PROBLEM AFTER TKOF FROM TOL.

Narrative: JUST AFTER LIFTOFF WE EXPERIENCED A SEVERE VIBRATION FOLLOWED BY A PARTIAL LOSS OF PWR ON THE L ENG. ENG EPR DROPPED FROM 1.95 TO 1.5, N1 DROPPED TO 70 PERCENT AND EGT WAS CLBING THROUGH 600 DEG, OIL PRESSURE AND TEMP WERE NORMAL. AFTER PULLING THE THROTTLE TO IDLE THE VIBRATION DIMINISHED AND ENG PARAMETERS RETURNED TO NORMAL. I ELECTED TO LEAVE ENG AT IDLE. AN EMER WAS DECLARED AND WE RETURNED TO LAND. AFTER COMPLETION OF ALL APPROPRIATE CHKLISTS WE LANDED WITHOUT FURTHER INCIDENCE AND THE EMER WAS TERMINATED. AFTER PARKING I INSPECTED THE ENG AND FOUND OIL LEAKING PROFUSELY FROM THE AFT SECTION. THE INLET HAD NO APPARENT DAMAGE. THE INLET GUIDE VANES AND FAN BLADES SHOWED ONLY NORMAL WEAR. HOWEVER, INSPECTION OF THE AFT SECTION SHOWED EXTENSIVE DAMAGE. THE TURBINE BLADES AND GUIDE VANES WERE SEVERELY BURNT WITH SOME OBVIOUS TWISTING. THE TURBINE BLADES WERE APPROX 30-40 PERCENT GONE.

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.