NTSB Identification: SEA87LA092.
The docket is stored on NTSB microfiche number 33766.
Accident occurred Wednesday, May 13, 1987 in SILETZ, OR
Probable Cause Approval Date: 05/02/1988
Aircraft: AEROSPATIALE SA315-D LAMA, registration: N47256
Injuries: 1 Minor.

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

DURING EXTERNAL LOAD OPERATIONS THE CHOCKERS BECAME LOOSE DUE TO IMPROPER LOADING. THE EXTERNAL LOAD LONGLINE CABLE BECAME ENTANGLED WITH THE TAILROTOR CAUSING A FAILURE OF THE TAIL ROTOR SYSTEM. THE HELICOPTER ASSUMED A NOSE DOWN ATTITUDE AND SPUN TO THE LEFT, IMPACTING TERRAIN WITH THE LEFT SKID, AND THEN ROLLING OVER ONTO ITS RIGHT SIDE. THE TAIL ROTOR WAS LOCATED 100 YARDS FROM THE IMPACT AREA.

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

PICKUP EQUIPMENT..DISCONNECTED

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

DIRECTIONAL CONTROL..NOT POSSIBLE..PILOT IN COMMAND

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

TIE DOWN..NOT ATTAINED..GROUND PERSONNEL

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

ROTOR SYSTEM..FAILURE,TOTAL

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

ROTOR SYSTEM..FOREIGN OBJECT

Index for May1987 | Index of months