NTSB Identification: FTW84LA213.
The docket is stored on NTSB microfiche number 25265.
Accident occurred Friday, April 27, 1984 in HARTSHORN, OK
Aircraft: AEROSPATIALE AS 315B, registration: N3835W
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 SUSTAINED SUBSTANTIAL DAMAGE DURING AN AUTOROTATIVE LANDING FOLLOWING AN EXPLOSION IN THE ENGINE COMPARTMENT. WHILE IN LEVEL FLIGHT AT 1000 FT AGL, THE PLT HEARD A LOUD SCREECH FROM THE ENGINE AREA FOLLOWED BY A LOUD BANG. A WINGMAN OBSERVED 10 FT FLAMES FROM THE ENGINE EXHAUST. A HARD AUTOROTATIVE LANDING RESULTED WHEN THE PLT ATTEMPTED TO STRETCH THE GLIDE TO A MORE SUITABLE LANDING AREA. THE PLT THEN EXTINGUISHED THE FIRE USING AN ONBOARD EXTINGUISHER. METALLURGICAL EXAM OF THE AXIAL COMPRESSOR SECTION TRACED THE COMPRESSOR BLADE FAILURE TO AN IMPROPER RETAINING PIN WHICH CAUSED A STRESS CONCENTRATION IN THE COMPRESSOR BLADE ROOT. IT WAS DETERMINED THAT THE PIN WAS INSTALLED DURING THE ORIGINAL MANUFACTURING PROCESS.

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

COMPRESSOR ASSEMBLY,BLADE RETENTION..IMPROPER

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

MAINTENANCE,INSTALLATION..IMPROPER..MANUFACTURER

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

COMPRESSOR ASSEMBLY,BLADE RETENTION..FAILURE,PARTIAL




Contributing Factors

PROPER GLIDEPATH..EXCEEDED..PILOT IN COMMAND

Index for Apr1984 | Index of months