NTSB Identification: LAX91LA078.
The docket is stored on NTSB microfiche number 43365.
Accident occurred Monday, January 21, 1991 in SACRAMENTO, CA
Probable Cause Approval Date: 01/25/1993
Aircraft: CESSNA 172P, registration: N96306
Injuries: 1 Serious.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE ACCIDENT SITE IS ABOUT 3 MILES SOUTH OF THE SACRAMENTO AIRPORT NEAR THE EXTENDED CENTERLINE FOR RUNWAY 34L. THE TRACON TRACKED THE ACCIDENT AIRCRAFT AS IT PENETRATED THE ARSA AT 1300 FEET MSL ON A NW BOUND HEADING. THE AIRCRAFT WAS OBSERVED TO TURN WEST BOUND AS IT DESCENDED TO 800 FT MSL AND CROSS THE EXTENDED RUNWAY CENTER LINE BEHIND AN ARRIVING AMERICAN AIRLINES MD80. THE CESSNA WAS OBSERVED ON RADAR TO CROSS THE FLIGHT PATH OF THE MD80 1 MILE BEHIND AND 100 FT LOWER THAN THE TRANSPORT BEFORE IT ABRUPTLY DISAPPEARED FROM THE RADAR. CONTROLLERS ON DUTY IN THE ATCT SAID THEY SAW THE LIGHTS OF THE CESSNA PASS BEHIND AND JUST BELOW THE MD80, THEN IT ABRUPTLY DESCENDED TOWARD THE GROUND.

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

THE FLIGHT'S INADVERTANT ENCOUNTER WITH WAKE TURBULENCE.

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