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NTSB Report
June 28, 1990 · Homebuilt JP-350-1 · N350JP
Torrance, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 28, 1990
Injury Outcomes
1 injury (1 minor injury)
Location
Torrance, CA
Aircraft
Homebuilt JP-350-1
Tail Number
N350JP
Operator
American Air Racing
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX90DUA01
THE PILOT OF THE HOMEBUILT SERVICED THE PROPELLER HUB WITH 120 PSI PRIOR TO DEPARTURE. AFTER TAKEOFF HE LOST CONTROL OF THE PROPELLER AND THE ENGINE LOST THRUST. EXAMINATION OF THE PROPELLER ASSEMBLY REVEALED NO EVIDENCE OF A PRE-IMPACT MALFUNCTION. THE PROPELLER BLADES HAD BEEN SHORTENED AND THE PROPELLER OVERSPEED OCCURRED BECASUE THE BLADES WERE NOT COUNTERWEIGHTED. HARTZELL STATED THE 120 PSI CHARGE IN THE HUB WAS INSUFFICIENT TO COUNTERACT THE AERODYNAMIC TWISTING MOMENTS AND PREVENT THE OVERSPEED.
NTSB Probable Cause
THE AIRCRAFT COLLISION WITH THE GROUND AFTER THE PILOT EXPERIENCED A LOSS OF ENGINE THRUST DUE TO PROPELLER OVERSPEED CONDITION. CONTRIBUTING TO THE ACCIDENT WAS THE PILOT'S IMPROPER SERVICING OF THE PROPELLER HUB THAT ALLOWED THE OVERSPEED TO OCCUR.
Full Narrative
THE PILOT OF THE HOMEBUILT SERVICED THE PROPELLER HUB WITH 120 PSI PRIOR TO DEPARTURE. AFTER TAKEOFF HE LOST CONTROL OF THE PROPELLER AND THE ENGINE LOST THRUST. EXAMINATION OF THE PROPELLER ASSEMBLY REVEALED NO EVIDENCE OF A PRE-IMPACT MALFUNCTION. THE PROPELLER BLADES HAD BEEN SHORTENED AND THE PROPELLER OVERSPEED OCCURRED BECASUE THE BLADES WERE NOT COUNTERWEIGHTED. HARTZELL STATED THE 120 PSI CHARGE IN THE HUB WAS INSUFFICIENT TO COUNTERACT THE AERODYNAMIC TWISTING MOMENTS AND PREVENT THE OVERSPEED.
Flight
Event TypeAccident
Event Time16:18 PDT
Nearest AirportTorrance Muni (0nm N)
Runway29R
Runway Length5000 ft
Runway Width150 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHomebuilt JP-350-1
Tail NumberN350JP
Aircraft CategoryAir
DamageSubstantial
OperatorAmerican Air Racing
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · L-1174-61 · Reciprocating · 350
Seats1
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 51 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind300° @ 14 kt
Visibility9 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter29.00 inHg
Observation Time22:18
Weather SourceWFAC