NTSB Identification: DEN89LA098.
The docket is stored on NTSB microfiche number 39689.
Accident occurred Monday, April 03, 1989 in ALAMOSA, CO
Probable Cause Approval Date: 09/30/1991
Aircraft: PIPER PA-28RT-201T, registration: N48DL
Injuries: 2 Uninjured.

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

DURING FLT AT 16,000 FT, THE ENG LOST POWER & BEGAN VIBRATING. THE PLT CONTACTED ARTCC & ANNOUNCED HIS INTENTIONS TO MAKE A FORCED LANDING AT THE ALAMOSA ARPT. HOWEVER, HE WAS UNABLE TO REACH THE ARPT & SELECTED A FIELD ABOUT 1 MI AWAY.DURING THE LANDING, THE ACFT ENCTRD SVRL IRRIGATION DITCHES & THE GEAR COLLAPSED. AN EXAM REVEALED THE ENG CRANKSHAFT HAD FAILED AT THE #2 & #3 JOURNALS. THERE WAS EVIDENCE THAT THE #2 PIN HAD FAILED FROM FATIGUE, THEN THE #3 PIN FAILED FROM OVERLOAD.

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

FATIGUE FAILURE OF THE ENGINE CRANKSHAFT. A FACTOR RELATED TO THE ACCIDENT WAS: THE TERRAIN CONDITION IN THE EMERGENCY LANDING AREA.

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