NTSB Identification: ANC90LA147.
The docket is stored on NTSB microfiche number 41439.
Nonscheduled 14 CFR
Accident occurred Friday, August 17, 1990 in JUNEAU, AK
Probable Cause Approval Date: 12/30/1992
Aircraft: AEROSPATIALE AS-350-B, registration: N26492
Injuries: 6 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

SHORTLY ATER TAKEOFF, THE HELICOPTER EXPERIENCED A COMPLETE ENGINE FAILURE. THE PILOT MADE AN EMERGENCY LANDING ONTO AN OPEN LOT. THE ENGINE FAILURE WAS DUE TO A FAILURE AND SEPARATION OF THE TURBINE INTERMEDIATE PINION DRIVEN GEAR WEB UNIT.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FAILURE OF THE FREE TURBINE INTERMEDIATE PINION DRIVEN GEAR AND SUBSEQUENT DISINTEGRATION OF THE FREE TURBINE ASSEMBLY.

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