ASN Wikibase Occurrence # 36068
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Date: | Wednesday 27 November 1991 |
Time: | 23:21 |
Type: | Aérospatiale SA 316B Alouette III |
Owner/operator: | Rocky Mountain Helicopters |
Registration: | N146RM |
MSN: | 1614 |
Year of manufacture: | 1969 |
Total airframe hrs: | 7525 hours |
Engine model: | TURBOMECA ARTOUSTE IIIB |
Fatalities: | Fatalities: 4 / Occupants: 4 |
Aircraft damage: | Destroyed |
Category: | Accident |
Location: | Bridgeport, CA -
United States of America
|
Phase: | En route |
Nature: | Ambulance |
Departure airport: | Bridgeport, CA (Q18) |
Destination airport: | Reno, NV |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:THE AEROMEDICAL EVACUATION (EMS-MEDEVAC) FLT WAS MADE AT NGT over MTN TRRN. THE PLT INTERRUPTED HIS NORMAL PSN RPRT & BROADCAST 'MAYDAY' 3 TIMES, GIVING HIS PSN TO A COMPANY DISPATCHER. HE DID NOT STATE THE NATURE OF THE EMERGENCY. NO FURTHER COMM WAS RECORDED. WITNESSES IN A SOUTHBOUND AUTO SAW THE HELICOPTER FLYING TOWARD THEM FROM THE SOUTH. THEY STATED THE HELICOPTER'S FUSELAGE STARTED ROTATING COUNTER-CLOCKWISE. IT THEN VEERED TO THE WEST, WENT OUT OF SIGHT, AND CRASHED. ALL MAJ COMPONENTS, EXCEPT ABOUT 33 INCHES OF THE TAIL ROTOR DRIVE SHAFT & ITS #5 BRG, WERE LOCATED. THE TAIL BOOM WAS FOUND IN 3 SECTIONS. ROTATIONAL & LONGITUDINAL SCORING DAMAGE WAS NOTED ON THE TAIL BOOM IN THE VCNTY OF THE #3 & #5 BRG SUPPORTS. A LAB RPRT STATED THAT THE ROTATIONAL DMG OCCURRED BEFORE THE GROSS DEFORMATION OF THE TAIL BOOM & SUBSEQUENT IN-FLT BREAKUP OF THE HELICOPTER. CAUSE: FAILURE OF THE HELICOPTER'S TAIL ROTOR DRIVE SHAFT AND DRIVE SHAFT BEARING DUE TO UNDETERMINED REASON(S).
Sources:
NTSB:
https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001212X18461
History of this aircraft
Other occurrences involving this aircraft Revision history:
Date/time | Contributor | Updates |
24-Oct-2008 10:30 |
ASN archive |
Added |
07-Feb-2009 10:23 |
harro |
Updated |
21-Dec-2016 19:22 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
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