Accident Aérospatiale AS 350D N5778W,
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ASN Wikibase Occurrence # 36171
 
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Date:Thursday 8 March 1990
Time:11:16
Type:Silhouette image of generic AS50 model; specific model in this crash may look slightly different    
Aérospatiale AS 350D
Owner/operator:Sinquanon Management Co
Registration: N5778W
MSN: 1394
Year of manufacture:1980
Total airframe hrs:1576 hours
Engine model:LYCOMING LTS-101-600A2
Fatalities:Fatalities: 2 / Occupants: 3
Aircraft damage: Destroyed
Category:Accident
Location:Atlantic Ocean, 3 miles off Miami, Dade County, Florida -   United States of America
Phase: En route
Nature:Passenger - Non-Scheduled/charter/Air Taxi
Departure airport:Fisher Island, Florida
Destination airport:Cat Cay, Bahamas (MYCC)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
THE HELICOPTER WAS IN CRUISE FLIGHT OVER THE OCEAN, WHEN THE PILOT HEARD A LOUD NOISE & NOTED A LOSS OF ENGINE POWER. HE ENTERED AN AUTOROTATION & TOLD THE PASSENGERS TO PUT ON THEIR LIFE JACKETS. AT ABOUT 100 FT ABOVE THE WATER, HE DEPLOYED THE EMERGENCY FLOATS, THEN SUCCESSFULLY LANDED IN THE OCEAN ABOUT 3 MILES FROM SHORE. AFTER LANDING, A WAVE HIT THE HELICOPTER & IT ROLLED OVER. THE PILOT & PASSENGERS GOT ONTO THE BELLY OF THE HELICOPTER, THEN THE PILOT DOVE UNDER THE WATER & RETRIEVED THE ELT [EMERGENCY LOCATION TRANSMITTER]. HOWEVER, AFTER HE ACTIVATED THE ELT, ANOTHER WAVE HIT & THE PILOT DROPPED IT AS HE REACHED TO HELP A PASSENGER. ONE PASSENGER EXPIRED ABOUT 8 HOURS LATER & THE OTHER PASSENGER EXPIRED ABOUT 15 HOURS AFTER THE ACCIDENT. BOTH DIED FROM DROWNING. THE ACCIDENT OCCURRED AT ABOUT 11:15 EST; THE COAST GUARD WAS NOTIFIED OF THE SITUATION AT 15:30 EST. THE PILOT WAS RESCUED AT 04:30 EST THE NEXT DAY [17 HOURS LATER]. A SUBSEQUENT EXAMINATION OF THE ENGINE REVEALED THAT A POWER TURBINE BLADE HAD FAILED FROM FATIGUE, WHICH RESULTED IN THE LOSS OF ENGINE POWER.

CAUSE: FATIGUE FAILURE OF AN ENGINE TURBINE BLADE, WHICH RESULTED IN A LOSS OF POWER. ROUGH OCEAN WATER IN THE EMERGENCY LANDING AREA WAS A RELATED FACTOR.

Sources:

1. NTSB: https://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20001212X22756&key=1
2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=5778W
3. http://www.griffin-helicopters.co.uk/accidentdetails.aspx?accidentkey=11553
4. http://www.ntsb.gov/doclib/recletters/1990/A90_112_114.pdf
5. http://www.planecrashinfo.com/1990/1990-19.htm

Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
01-Jul-2014 19:29 Dr. John Smith Updated [Time, Operator, Location, Phase, Nature, Departure airport, Destination airport, Source, Narrative]
21-Dec-2016 19:22 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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