ASN Wikibase Occurrence # 361086
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Date: | Tuesday 9 November 1993 |
Time: | 10:00 LT |
Type: | Bell 47G-3B-2 Soloy |
Owner/operator: | Farm & Forest Helicopter Svc |
Registration: | N8169J |
MSN: | 6775 |
Year of manufacture: | 1970 |
Total airframe hrs: | 3013 hours |
Engine model: | Allison 250-C20B |
Fatalities: | Fatalities: 0 / Occupants: 1 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Toledo, WA -
United States of America
|
Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
Nature: | Unknown |
Departure airport: | |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:WHILE LIFTING CHRISTMAS TREES UNDER EXTERNAL LOAD CONDITIONS THE PILOT HEARD A CLUNK AND EXPERIENCED A LOSS OF POWER. HE ATTEMPTED AN AUTOROTATION FROM 40 TO 50 FEET INTO THE CHRISTMAS TREE FARM, STRIKING AND BENDING THE TAIL BOOM WHEN IT IMPACTED A TREE. INVESTIGATION REVEALED THAT THE TRANSMISSION SHEAR BOLTS, PN 47-620-485-9, HAD SHEARED. THE PILOT ATTRIBUTED THE FAILURE OF THE SHEAR BOLTS TO POWER IMPULSES FROM REPEATED COMPRESSOR STALLS.
Probable Cause: TRANSMISSION SHEAR BOLTS FAILED CAUSING A LOSS OF POWER TO THE ROTOR SYSTEM, AND THE PILOT ENCOUNTERED UNSUITABLE TERRAIN DURING HIS AUTOROTATION ATTEMPT.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | SEA94LA029 |
Status: | Investigation completed |
Duration: | 1 year |
Download report: | Final report |
|
Sources:
NTSB SEA94LA029
History of this aircraft
Other occurrences involving this aircraft Location
Revision history:
Date/time | Contributor | Updates |
16-Mar-2024 14:39 |
ASN Update Bot |
Added |
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