NTSB Identification: SEA93FA178.
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Accident occurred Wednesday, August 18, 1993 in SEATTLE, WA
Probable Cause Approval Date: 08/01/1994
Aircraft: ENSTROM F-28C, registration: N86198
Injuries: 1 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.

WHILE EN ROUTE AT ABOUT 800 FEET AGL, THE HELICOPTER EXPERIENCED A COMPLETE LOSS OF POWER. THE PILOT MADE AN AUTOROTATION TO A CONFINED GRASSY AREA, BUT JUST PRIOR TO TOUCHDOWN HAD TO MANEUVER TO AVOID A PERSON IN THE AREA OF DESIRED LANDING. THE AIRCRAFT TOUCHED DOWN, BOUNCED, AND THEN EXPERIENCED A SKID COLLAPSE WHEN IT TOUCHED DOWN A SECOND TIME. AN INSPECTION OF ENGINE COMPONENTS SHOWED THAT ONE MAGNETO CONDENSER WAS SHORTING-OUT BY ARCING OVER ITS INSULATOR BASE, AND THE SECOND CONDENSER WAS SHORTING-OUT WHERE THE LEAD WIRE WAS EXPOSED THROUGH ITS INSULATION.

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

SHORTED MAGNETO CONDENSERS. FACTORS INCLUDE A HIDDEN OBSTRUCTION IN THE LANDING AREA, AND A REDUCTION IN ROTOR RPM FROM ATTEMPTING TO AVOID THE OBSTRUCTION.

Full narrative available

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