NTSB Identification: BFO89LA001.
The docket is stored on NTSB microfiche number 38449.
Accident occurred Thursday, October 06, 1988 in SANDSTON, VA
Probable Cause Approval Date: 01/04/1990
Aircraft: CESSNA 172, registration: N739PE
Injuries: 1 Minor.

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 PLT SAID HE WAS ON FINAL APCH ABOUT 600 TO 800 FT AGL WHEN POWER LOSS OCCURRED. HE FORCED LANDED ON AN OPEN FIELD ABOUT 1/2 MI SHORT OF THE RWY. THE ENG EXAM REVEALED THAT TWO TEETH OF THE IDLER GEAR HAD SEPARATED. THIS RESULTED IN A LOSS OF CONTINUITY BETWEEN THE CRANKSHAFT, THE CAMSHAFT, AND THE LEFT MAGNETO. METALLURGICAL EXAM DISCLOSED THAT THE TEETH SEPARATED BECAUSE OF OVERLOAD. THE ENGINE HAD BEEN INSTALLED ON ANOTHER AIRCRAFT THAT WAS INVOLVED IN AN ACCIDENT OF WHICH THE DETAILS WERE NOT DETERMINED.

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

ACCESSORY DRIVE ASSY,DRIVE GEAR..PREVIOUS DAMAGE

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

MAINTENANCE..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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

ACCESSORY DRIVE ASSY,DRIVE GEAR..FAILURE,TOTAL


Contributing Factors

TERRAIN CONDITION..SOFT



Contributing Factors

ENGINE ASSEMBLY,CAMSHAFT..DISENGAGED


Contributing Factors

IGNITION SYSTEM,MAGNETO..DISENGAGED

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