A eurocopter 350b3, while engine was idling prior to takeoff, the crew heard a loud bang. Found engine drive train flexible coupling to gear box failed.

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Attributes
ACN	600612
Time
Date	200311
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	other
Make Model Name	AS 350 Astar/Ecureuil
Operating Under FAR Part	Part 91
Flight Phase	ground : preflight
Person 1
Qualification	technician : inspection authority technician : airframe technician : powerplant
Experience	maintenance lead technician : 9 maintenance technician : 12
ASRS Report	600612
Person 2
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After returning an aircraft to service after a 100 hour inspection and engine installation, there was a failure of the drive train at a flex coupling. Cause of the failure is being investigated.

Original NASA ASRS Text

Title: A EUROCOPTER 350B3, WHILE ENG WAS IDLING PRIOR TO TKOF, THE CREW HEARD A LOUD BANG. FOUND ENG DRIVE TRAIN FLEXIBLE COUPLING TO GEAR BOX FAILED.

Narrative: AFTER RETURNING AN ACFT TO SVC AFTER A 100 HR INSPECTION AND ENG INSTALLATION, THERE WAS A FAILURE OF THE DRIVE TRAIN AT A FLEX COUPLING. CAUSE OF THE FAILURE IS BEING INVESTIGATED.

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.