ASN Wikibase Occurrence # 39230
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Date: | Saturday 28 April 1990 |
Time: | 08:00 |
Type: | Sikorsky S-58F |
Owner/operator: | Command Helicopters |
Registration: | N871 |
MSN: | 58-898 |
Engine model: | CURTIS WRIGHT 989 C9HE1 |
Fatalities: | Fatalities: 1 / Occupants: 1 |
Aircraft damage: | Destroyed |
Category: | Accident |
Location: | Southfield, MI -
United States of America
|
Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
Nature: | Cargo |
Departure airport: | |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:THE HELICOPTER WAS HOVERING IN PLACE DURING A ROOFTOP EQUIPMENT REMOVAL OPERATION WHEN IT ABRUPTLY DESCENDED ONTO THE STRUCTURE FROM WHICH THE LIFT WAS BEING MADE. IT THEN NOSED OVER THE STRUCTURE & IMPACTED APRX 10 FT BELOW ON THE ROOF OF THE 15TH FLOOR. THE WORKERS HEARD NO VERBAL WARNING FROM THE PILOT. ACOUSTICAL ANALYSIS OF A VIDEO REVEALED THAT DURING THE DESCENT THERE WAS A STEADY INCREASE IN ENGINE, M/R, AND T/R RPM. POST MORTEM EXAM OF THE PILOT REVEALED FOCAL ATHEROSCLEROSIS 50% LEFT AND RIGHT CORONARY ARTERY, LEFT ANTERIOR DESCENDING, AND LEFT CIRCUMFLEX. THE PILOT & CREW HAD OPERATED TOGETHER AS A TEAM FOR 18 YRS & THE CREW STATED THAT THE PILOT, WITH NO EXCEPTIONS, HAD ALWAYS NOTIFIED THEM BY RADIO WHEN UNEXPECTED OCCURRENCES CAUSED PREMATURE RELEASES. CAUSE: A LOSS OF CONTROL DUE TO PHYSICAL INCAPACITATION FOR UNKNOWN REASON(S).
Sources:
NTSB:
https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001212X22875 Revision history:
Date/time | Contributor | Updates |
24-Oct-2008 10:30 |
ASN archive |
Added |
20-Jul-2010 11:40 |
TB |
Updated [Other fatalities, Nature] |
21-Dec-2016 19:23 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
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