LAX91LA307

1991-07-11 · EL CERRITO, California, United States · Serious · 1 aircraft · Status: Completed

Aircraft involved

N4070H Robinson R22A Serious

Probable cause & findings

THE INSTRUCTOR PILOT'S IMPROPER SLOPE TAKEOFF TECHNIQUE.

Factual narrative

THE INSTRUCTOR PILOT WAS DEMONSTRATING SLOPE TAKEOFF TECHNIQUES TO THE STUDENT AFTER THE STUDENT HAD LANDED ON A HILLSIDE THAT SLOPED DOWNWARD FROM LEFT TO RIGHT. THE INSTRUCTOR LIFTED THE HELICOPTER'S RIGHT DOWN SLOPE SKID TWICE WHILE THE LEFT SKID REMAINED ON THE GROUND. DURING THE THIRD LIFT-OFF THE INSTRUCTOR DID NOT LIFT THE LEFT SKID AS THE HELICOPTER RAISED AND IT ROLLED OVER UPSLOPE ON ITS LEFT SIDE. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12

Verbatim from NTSB's published report. Source file NTSB_1991_LAX91LA307.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

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