Air carrier has engine vibrate and spool down at cruise.

Attributes
ACN	183870
Time
Date	199107
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 28000 msl bound upper : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau tower : sfo
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 6000 flight time type : 2000
ASRS Report	183870
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	183873
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	other
Supplementary
Primary Problem	Aircraft

Narrative:

Climbing out from ord through 28000 ft, engine #2 had vibration and spooled down. Performed emergency shutdown procedure and returned to chicago.

Original NASA ASRS Text

Title: ACR HAS ENG VIBRATE AND SPOOL DOWN AT CRUISE.

Narrative: CLBING OUT FROM ORD THROUGH 28000 FT, ENG #2 HAD VIBRATION AND SPOOLED DOWN. PERFORMED EMER SHUTDOWN PROC AND RETURNED TO CHICAGO.

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.