NTSB Identification: LAX82FA167
14 CFR Part 91: General Aviation
Accident occurred Monday, May 10, 1982 in MORMAN LAKE, AZ
Probable Cause Approval Date: 05/10/1983
Aircraft: CESSNA 172, registration: N78810
Injuries: 2 Fatal,2 Serious.

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 ACFT DEPARTED WINSLOW, AZ ON A FLT TO LONG BEACH, CA WITH AN EN ROUTE STOP SCHEDULED FOR PRESCOT, AZ. BEFORE DEPARTING WINSLOW, THE PLT WAS WARNED BY ANOTHER PLT THAT HE HAD ENCOUNTERED EXTREME TURBULENCE IN THE VICINITY OF MORMON MTN. THE PLT AND PAX'S REMAINED OVERNIGHT AT WINSLOW. THE NEXT MORNING THE PLT WAS ADVISED BY THE OTHER PLT THAT THE WX CONDS AT MORMON & MINGUS MTNS WERE STILL HAZARDOUS, HE RECOMMENDED THAT THEY FLY A SOUTHERLY ROUTE TOWARD PHOENIX, AZ TO CIRCUMNAVIGATE THE HIGH TERRAIN. THE PLT TOOK OFF & CONTD WESTBOUND. HE REPORTED THAT AS THEY PASSED OVER MORMON LAKE, THE PLANE BEGAN TO LOSE ALTITUDE. REPORTEDLY, HE STARTED TO CIRCLE OVER THE LAKE TO GAIN ALTITUDE, BUT ENCOUNTERED A DOWNDRAFT AND THE ACFT COLLIDED WITH TREES & CRASHED (7600' MSL). DURING AN EXAM OF THE WRECKAGE, NO PREIMPACT, MECHANICAL DISCREPANCIES WERE FOUND THAT WOULD HAVE CONTRIBUTED TO THE ACCIDENT. A WEIGHT & BALANCE COMPUTATION REVEALED THE GROSS WEIGHT WAS APRX 2474 LBS. THE MAX AUTHORIZE GROSS WEIGHT WAS 2300 LBS.

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

PREFLIGHT PLANNING/PREPARATION..INADEQUATE..PILOT IN COMMAND


Contributing Factors

AIRCRAFT WEIGHT AND BALANCE..EXCEEDED..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

WEATHER CONDITION..TURBULENCE


Contributing Factors

WEATHER CONDITION..DOWNDRAFT


Contributing Factors

TERRAIN CONDITION..HIGH TERRAIN


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

OBJECT..TREE(S)

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