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NTSB Report
September 30, 1992 · Robinson R22-B · N8069X
Martinez, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
September 30, 1992
Injury Outcomes
2 injuries (2 fatalities)
Location
Martinez, CA
Aircraft
Robinson R22-B
Tail Number
N8069X
Operator
Helicopter Adventures
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
LAX92FA410
THE CERTIFICATED FLIGHT INSTRUCTOR AND A PROSPECTIVE STUDENT DEPARTED FOR A SHORT HELICOPTER DEMONSTRATION FLIGHT IN CLEAR VFR CONDITIONS. THREE MINUTES AFTER DEPARTURE, THE HELICOPTER WAS OVER-FLYING AN URBAN PARK AREA, ABOUT 1 AND 1/2 MILES WEST OF THE DEPARTURE AIRPORT. WITNESSES HEARD POPPING, BANGING, AND THUMPING NOISES. THE ENGINE THEN QUIT RUNNING. THE MAIN ROTOR DEPARTED ITS NORMAL PLANE OF ROTATION WITH SUFFICIENT RPM TO CONTACT THE RIGHT FRONT PORTION OF THE COCKPIT WINDSHIELD AND STRIKE THE RIGHT SEAT PASSENGER. MAIN ROTOR RPM THEN IMMEDIATELY DECAYED AND STOPPED. THE HELICOPTER WAS THEN OBSERVED IN A STEEP NOSE DOWN ANGLE OF DESCENT UNTIL IMPACTING THE GROUND. NO MALFUNCTION OF THE ENGINE, DRIVE TRAIN, OR FLIGHT CONTROLS WAS FOUND.
NTSB Probable Cause
AN UNDETERMINED DIVERGENCE OF THE MAIN ROTOR FROM ITS NORMAL PLANE OF ROTATION WHICH RESULTED IN ROTOR CONTACT TO THE FUSELAGE AND PASSENGER.
Full Narrative
THE CERTIFICATED FLIGHT INSTRUCTOR AND A PROSPECTIVE STUDENT DEPARTED FOR A SHORT HELICOPTER DEMONSTRATION FLIGHT IN CLEAR VFR CONDITIONS. THREE MINUTES AFTER DEPARTURE, THE HELICOPTER WAS OVER-FLYING AN URBAN PARK AREA, ABOUT 1 AND 1/2 MILES WEST OF THE DEPARTURE AIRPORT. WITNESSES HEARD POPPING, BANGING, AND THUMPING NOISES. THE ENGINE THEN QUIT RUNNING. THE MAIN ROTOR DEPARTED ITS NORMAL PLANE OF ROTATION WITH SUFFICIENT RPM TO CONTACT THE RIGHT FRONT PORTION OF THE COCKPIT WINDSHIELD AND STRIKE THE RIGHT SEAT PASSENGER. MAIN ROTOR RPM THEN IMMEDIATELY DECAYED AND STOPPED. THE HELICOPTER WAS THEN OBSERVED IN A STEEP NOSE DOWN ANGLE OF DESCENT UNTIL IMPACTING THE GROUND. NO MALFUNCTION OF THE ENGINE, DRIVE TRAIN, OR FLIGHT CONTROLS WAS FOUND.
Flight
Event TypeAccident
Event Time14:45 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRobinson R22-B
Tail NumberN8069X
Aircraft CategoryHeli
DamageDestroyed
OperatorHelicopter Adventures
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-B2C · Reciprocating · 160
Seats2
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 28 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind240° @ 14 kt
Visibility20 sm
CeilingNone
Temperature / Dew Point63 F
Altimeter29.00 inHg
Observation Time21:45
Weather SourceWFAC