RICHMOND, CA, USA
N6507H
CESSNA 152
THE LOCAL AREA DUAL INSTRUCTIONAL FLIGHT WAS ENROUTE TO THE PRACTICE AREA AT AN ALTITUDE OF 1,300 FEET WHEN THE ENGINE SUDDENLY LOST POWER. THE INSTRUCTOR'S ATTEMPTS TO REMEDY THE LOSS OF POWER WERE UNSUCCESSFUL AND THE AIRCRAFT COLLIDED WITH A BRIDGE STRUCTURE AND AN AUTOMOBILE DURING AN ATTEMPTED FORCED LANDING ON A FREEWAY. THE AIRCRAFT WAS EXAMINED BY AN FAA AIRWORTHINESS INSPECTOR. IN HIS REPORT OF THE EXAMINATION, THE INSPECTOR NOTED THAT NO MECHANICAL MALFUNCTIONS OR FAILURES WERE IDENTIFIED. THE OAKLAND, CALIFORNIA, AVIATION WEATHER OBSERVATION TAKEN AT 0945 HOURS REPORTED A TEMPERATURE OF 55 DEGREES AND A DEW POINT OF 41 DEGREES. REVIEW OF A CARBURETOR ICING PROBABILITY CHART REVEALED THAT THE TEMPERATURE AND DEW POINT FALLS WITHIN AN AREA DEFINED AS 'SERIOUS ICING - CRUISE OR CLIMB POWER'.
LOSS OF ENGINE POWER DUE TO CARBURETOR ICE. A FACTOR IN THE ACCIDENT WAS THE FAILURE OF THE INSTRUCTOR TO PROPERLY SUPERVISE THE CONDUCT OF THE FLIGHT.
Source: NTSB Aviation Accident Database
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