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NTSB Report
August 22, 1984 · Benson B8M · N45684
Newman Lake, WA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
August 22, 1984
Injury Outcomes
1 injury (1 fatality)
Location
Newman Lake, WA
Aircraft
Benson B8M
Tail Number
N45684
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
SEA84FA209
WITNESSES OBSERVED THE AIRCRAFT GO THROUGH A SERIES OF RAPID PITCH OSCILLATIONS AT ABOUT 300 FT AGL. THE PITCH CHANGES INCREASED IN MAGNITUDE AND SEVERITY UNTIL THE MAIN ROTOR BLADES STRUCK THE RUDDER STOPPING IT'S ROTATION AND RESULTING IN AN UNCONTROLLED NEAR VERTICAL DESCENT. THERE WAS NO SOLO ENDORSEMENT ON THE STUDENT'S CERTIFICATE.
Full Narrative
WITNESSES OBSERVED THE AIRCRAFT GO THROUGH A SERIES OF RAPID PITCH OSCILLATIONS AT ABOUT 300 FT AGL. THE PITCH CHANGES INCREASED IN MAGNITUDE AND SEVERITY UNTIL THE MAIN ROTOR BLADES STRUCK THE RUDDER STOPPING IT'S ROTATION AND RESULTING IN AN UNCONTROLLED NEAR VERTICAL DESCENT. THERE WAS NO SOLO ENDORSEMENT ON THE STUDENT'S CERTIFICATE.
Flight
Event TypeAccident
Event Time18:50 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBenson B8M
Tail NumberN45684
Aircraft CategoryGyro
DamageDestroyed
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsMcculloch · O-100-1 4318A · Reciprocating · 72
Seats1
People & Injuries
Injury Summary1 injury (1 fatality)
Fatal1
Serious0
Minor0
Uninjured0
Total1
Crew 1Age 31 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind350° @ 6 kt
Visibility30 sm
CeilingNone
Temperature / Dew Point36 C
Altimeter29.00 inHg
Observation Time01:00
Weather SourceWFAC