NTSB Identification: LAX82FA329
14 CFR Part 91: General Aviation
Accident occurred Thursday, September 02, 1982 in NEAR ISLETON, CA
Probable Cause Approval Date: 09/02/1983
Aircraft: CHAMPION 7EC, registration: N141A
Injuries: 2 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE PILOT AND PASSENGER WERE ON A LOCAL FLIGHT TO FLY TO THE SAN JOAQUIN RIVER DELTA TO OBSERVE AND PHOTOGRAPH A BREAK IN THE RIVER'S LEVEL, AS WELL AS THE PASSENGER'S BOAT. A CONSENSUS OF THE WITNESSES WAS THAT THE AIRCRAFT WAS CIRCLING THE AREA WHEN IT STRUCK UNMARKED POWER LINES THAT TRAVERSED THE RIVER. AFTER IMPACT, THE AIRCRAFT STRUCK THE WATER AND SANK. LATER, THE AIRCRAFT WAS RECOVERED. AN EXAMINATION OF THE AIRCRAFT AND ENGINE DISCLOSED NO EVIDENCE OF PREEXISTING MALFUNCTION OR FAILURE THAT WOULD HAVE AFFECTED THE PLANE'S PERFORMANCE. THE PILOT DID NOT POSSESS A CURRENT MEDICAL CERTIFICATE.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

VISUAL LOOKOUT..INADEQUATE..PILOT IN COMMAND


Contributing Factors

OBJECT..WIRE,TRANSMISSION



Contributing Factors

TERRAIN CONDITION..WATER,ROUGH

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