NTSB Identification: CHI86LA236.
The docket is stored on NTSB microfiche number 32387.
Accident occurred Friday, September 26, 1986 in BALDWIN, WI
Aircraft: HUGHES 269B, registration: N9427F
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.

AFTER PICKING UP HIS PASSENGER AT WILLIAMS PIPELINE, MINNEAPOLIS, MINNESOTA, THE PLT FLEW EASTWARD ALONG INTERSTATE 90 ENROUTE TO A PIPELINE NEAR WAUSAU, WISCONSIN. WHILE FLYING AT APPROXIMATELLY 400 FEET, THE PLT AND PASSENGER STATED THAT THE ENGINE STARTED TO MAKE A GRINDING OR KNOCKING NOISE AND THAT THERE WAS AN ALMOST INSTANTANEOUS LOSS OF POWER. THE PLT THEN DROPPED THE COLLECTIVE AND TURNED APPROXIMATELY 40 DEGREES TO THE SANDY, UPWARD SLOPING GROUND. THE NOSE OF THE AIRCRAFT REMAINED LOW AND THE TAILBOOM RAISED. THE MAIN ROTOR BLADES THEN STRUCK THE TAILBOOM. WRECKAGE EXAMINATION REVEALED THAT THE NUMBER FOUR PISTON ROD PROTRUDED THROUGH THE ENGINE CASE, WHICH WAS CRACKED FROM THE HOLE TO THE NUMBER FOUR CYLINDER BASE.

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

ENGINE ASSEMBLY,CRANKCASE..CRACKED

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