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LAX90DUA01

1990-06-28 · TORRANCE, California, United States · Minor · 1 aircraft · Status: Completed

Airport TOA

N350JP has since been reassigned. It is now registered to a different aircraft (BEECHCRAFT CORP B300, built 2014), which was not involved in this event.

Aircraft involved

Probable cause & findings

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.

Factual 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. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12

Verbatim from NTSB's published report. Source file NTSB_1990_LAX90DUA01.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

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Related research

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