NTSB Identification: FTW87FA190.
The docket is stored on NTSB microfiche number 35093.
Nonscheduled 14 CFR
Accident occurred Friday, August 07, 1987 in GEORGETOWN, TX
Probable Cause Approval Date: 01/11/1989
Aircraft: CESSNA 206G, registration: N8873Q
Injuries: 3 Uninjured.

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.

TEARDOWN OF THE AIRCRAFT ENGINE REVEALED THAT THE ENGINE COUNTERWEIGHT VIBRATION DAMPER ASSEMBLY WAS OUT OF TOLERANCE. THIS ALLOWED EXCESSIVE ENGINE VIBRATION WHICH RESULTED IN FAILURE OF THE CAMSHAFT DRIVE GEAR AND TOTAL ENGINE FAILURE. THE PILOT EXECUTED A FORCED LANDING INTO A WOODED AREA. ALTITUDE WOULD NOT ALLOW HIM TO REACH THE GEORGETOWN AIRPORT AND THE PILOT STATED THAT HE STALLED THE AIRCRAFT AND ALLOWED IT TO SETTLE INTO THE TREES TO MINIMIZE IMPACT SPEED. THE AIRCRAFT WAS EQUIPPED WITH ONE PASSENGER SEAT AND TWO PAESENGERS WERE ON BOARD THE AIRCRAFT AT IMPACT. THE PASSENGER JUMPSEAT NORMALLY IN THE REAR OF THE AIRCRAFT HAD BEEN REMOVED. THE SECOND PASSENGER WAS SITTING IN THE CARGO AREA BEHIND THE CREW COMPARTMENT.

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

ENG ASSEMBLY,CRANKSHAFT COUNTERWEIGHTS/VIB DAMPER..VIBRATION

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

ENGINE ASSEMBLY,CAMSHAFT..FAILURE,TOTAL



Contributing Factors

TERRAIN CONDITION..NONE SUITABLE


Contributing Factors

OBJECT..TREE(S)


Contributing Factors

STALL/MUSH..INTENTIONAL..PILOT IN COMMAND


Contributing Factors

LIGHT CONDITION..NIGHT

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