NTSB Identification: DEN84LA292.
The docket is stored on NTSB microfiche number 26051.
Nonscheduled 14 CFR
Accident occurred Monday, September 17, 1984 in MOUNTAIN VIEW, WY
Aircraft: AEROSPATIALE SA315B LAMA, registration: N49532
Injuries: 1 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.

THE HELICOPTER EXPERIENCED A LOSS OF POWER DURING AN EXTERNAL LOAD OPERATION. THE PLT RELEASED THE LOAD AND PERFORMED AN AUTOROTATION. A HARD LANDING RESULTED DURING WHICH THE TAIL BOOM WAS SEVERED BY THE MAIN ROTOR BLADES. METALLURGICAL EXAMINATION OF THE ENGINE COMPRESSOR SECTION REVEALED THE REAR 1/3 OF THE #3 COMPRESSOR BLADE SEPARATED FROM THE ASS'Y BY A TRANSVERSE FRACTURE THROUGH THE PLATFORM AND AIRFOIL. THE #5 ATTACHMENT PIN SEPARATED APRX 1/4 INCH FROM ITS AFT SURFACE. THE FRACTURE OCCURRED DUE TO A COMBINATION OF STRESS CORROSION CRACKING, FATIGUE PROGRESSION AND BENDING OVERSTRESS.

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

COMPRESSOR ASSEMBLY,BLADE RETENTION..CORRODED

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

COMPRESSOR ASSEMBLY,BLADE RETENTION..BENT

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

COMPRESSOR ASSEMBLY,BLADE RETENTION..FATIGUE

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

COMPRESSOR ASSEMBLY,BLADE..SEPARATION




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