ASN Wikibase Occurrence # 75234
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| Date: | Thursday 23 June 1988 |
| Time: | 16:42 |
| Type: |  Sikorsky S-76A |
| Owner/operator: | |
| Registration: | N54C |
| MSN: | 760116 |
| Total airframe hrs: | 2466 hours |
| Engine model: | ALLISON 250-C30 |
| Fatalities: | Fatalities: 0 / Occupants: 6 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Moundsville, WV -
 United States of America
|
| Phase: | Take off |
| Nature: | Unknown |
| Departure airport: | Mining site Moundsville |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
HE 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 as follows:
VISUAL LOOKOUT..INADEQUATE..PILOT IN COMMAND
VISUAL LOOKOUT..INADEQUATE..COPILOT/SECOND PILOT
Contributing Factors:
OBJECT..WIRE,STATIC
PREFLIGHT PLANNING/PREPARATION..INADEQUATE..PILOT IN COMMAND
VISUAL/AURAL PERCEPTION..PILOT IN COMMAND
Sources:
https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001213X25881&key=1&queryId=e1098e0d-1a88-4fc4-93d3-b540dca136fb&pgno=10&pgsize=200
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Jun-2010 06:25 | TB | Added |
| 15-Aug-2015 13:54 | Aerossurance | Updated [Departure airport, Source, Damage, Narrative] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
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