NTSB Identification: BFO88LA058.
The docket is stored on NTSB microfiche number 36027.
Accident occurred Thursday, June 23, 1988 in MOUNDSVILLE, WV
Probable Cause Approval Date: 02/28/1989
Aircraft: SIKORSKY S-76A, registration: N54C
Injuries: 2 Minor,4 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.

THE HELICOPTER CONTACTED POWER LINES SHORTLY AFTER TAKEOFF FROM A MINE SITE. THE NOSE GEAR OF THE HELICOPTER CONTACTED AN UNINSULATED STATIC WIRE. THIS WIRE WAS STRUNG WITH ONE OTHER STATIC WIRE AND TWO BLACK INSULATED POWER LINES. BOTH CREW MEMBERS STATED THAT THEY SAW THE BLACK LINES AND BELIEVED THEIR RATE OF CLIMB WOULD ALLOW ADEQUATE CLEARANCE. AFTERHITTING THE FIRST SET OF LINES, THE HELICOPTER BEGAN A DESCENDING TURN AND THEN CONTACTED A SECOND SET OF POWER LINES ALONG WITH A POWER POLE. THE HELICOPTER THEN COLLIDED WITH A SWITCHING HOUSE AND CAME TO REST ALONGSIDE A EARTHEN SUPPLYSLOPE. NONE OF THE WIRES WERE MARKED. THE CAPTAIN STATED THAT HE DID NOT SEE THE SILVER COLORED STATIC WIRES.

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

VISUAL LOOKOUT..INADEQUATE..PILOT IN COMMAND

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

VISUAL LOOKOUT..INADEQUATE..COPILOT/SECOND PILOT



Contributing Factors

OBJECT..WIRE,STATIC


Contributing Factors

PREFLIGHT PLANNING/PREPARATION..INADEQUATE..PILOT IN COMMAND




Contributing Factors

VISUAL/AURAL PERCEPTION..PILOT IN COMMAND

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