B767 crew returns to gate after chronic engine vibration problem occurs on engine start.

Attributes
ACN	469770
Time
Date	200004
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : pushback
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	469770
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : vibration indication other flight crewa
Resolutory Action	other
Consequence	other other
Supplementary
Problem Areas	Aircraft Company
Primary Problem	Aircraft

Narrative:

After engine start, right engine vibration indicator showed 5.0 lpt. This is a very high reading. Returned to gate for maintenance action. This aircraft had history of doing this on last 10 takeoffs. Aircraft was taken OTS.

Original NASA ASRS Text

Title: B767 CREW RETURNS TO GATE AFTER CHRONIC ENG VIBRATION PROB OCCURS ON ENG START.

Narrative: AFTER ENG START, R ENG VIBRATION INDICATOR SHOWED 5.0 LPT. THIS IS A VERY HIGH READING. RETURNED TO GATE FOR MAINT ACTION. THIS ACFT HAD HISTORY OF DOING THIS ON LAST 10 TKOFS. ACFT WAS TAKEN OTS.

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.