A B757-200 in cruise at FL330 diverted due to left engine vibration in amber band. Vibration followed throttle movement.

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Attributes
ACN	635512
Time
Date	200410
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 33000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	635512
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	635511
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : l vibration indication other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : diverted to another airport
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After leveloff at FL330, #1 engine was noted in the amber band for vibration. Reducing throttle as per QRH would decrease below amber but still well above #2 engine. Elected to return to ZZZ. Overweight landing at approximately 229000 pounds. Callback conversation with reporter revealed the following information: reporter said the engine was a rolls royce rb-211 and the engine was replaced.

Original NASA ASRS Text

Title: A B757-200 IN CRUISE AT FL330 DIVERTED DUE TO L ENG VIBRATION IN AMBER BAND. VIBRATION FOLLOWED THROTTLE MOVEMENT.

Narrative: AFTER LEVELOFF AT FL330, #1 ENG WAS NOTED IN THE AMBER BAND FOR VIBRATION. REDUCING THROTTLE AS PER QRH WOULD DECREASE BELOW AMBER BUT STILL WELL ABOVE #2 ENG. ELECTED TO RETURN TO ZZZ. OVERWT LNDG AT APPROX 229000 LBS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR SAID THE ENG WAS A ROLLS ROYCE RB-211 AND THE ENG WAS REPLACED.

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.