B757 returns to mia when vibration level of right engine exceeds normal parameters.

Attributes
ACN	615782
Time
Date	200404
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zma.artcc
State Reference	FL
Altitude	msl single value : 35000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : zma.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 : captain oversight : pic
Qualification	pilot : atp
ASRS Report	615782
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eng vibration indicator
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Amber vibration indication on right engine in cruise. 2.7 N1 units. Diverted to mia. Declared emergency. Vibration decreased with partial power reduction in descent. No secondary indications. Overweight landing performed at a weight of approximately 211000 pounds.

Original NASA ASRS Text

Title: B757 RETURNS TO MIA WHEN VIBRATION LEVEL OF R ENG EXCEEDS NORMAL PARAMETERS.

Narrative: AMBER VIBRATION INDICATION ON R ENG IN CRUISE. 2.7 N1 UNITS. DIVERTED TO MIA. DECLARED EMER. VIBRATION DECREASED WITH PARTIAL PWR REDUCTION IN DSCNT. NO SECONDARY INDICATIONS. OVERWT LNDG PERFORMED AT A WT OF APPROX 211000 LBS.

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.