NTSB Identification: SEA89LA029.
The docket is stored on NTSB microfiche number 37465.
Accident occurred Monday, December 26, 1988 in NEWBERG, OR
Probable Cause Approval Date: 09/11/1989
Aircraft: BELL 47G3-B1, registration: N8587F
Injuries: 1 Minor,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.

AS PLT SLOWED HELICOPTER TO ABOUT 10 KTS FORWARD SPEED, TAIL ROTOR EFFECTIVENESS DECREASED. ACFT YAWED RIGHT INTO DESCENT TO GROUND CONTACT.

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

ROTORCRAFT FLIGHT CONTROLS..IMPROPER USE OF..PILOT IN COMMAND

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

ROTOR RPM..INADEQUATE..PILOT IN COMMAND

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