ASN Wikibase Occurrence # 31087
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Date: | Wednesday 16 April 1997 |
Time: | 15:50 |
Type: | Bell 204B |
Owner/operator: | South Coastal Helicopter/U.S. Forest Service |
Registration: | N4580Y |
MSN: | 2066 |
Year of manufacture: | 1967 |
Total airframe hrs: | 6645 hours |
Fatalities: | Fatalities: 0 / Occupants: 1 |
Aircraft damage: | Destroyed |
Category: | Accident |
Location: | near Calderwood, TN -
United States of America
|
Phase: | Unknown |
Nature: | Fire fighting |
Departure airport: | Copperhill ,TN |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:The main drive failed at the transmission end resulting in loss of transmission drive. The pilot performed a autorotation landing in trees and the helicopter rolled inverted and descended through the trees coming to rest on a river bank. Metallurgical examination showed the main drive shaft teeth had separated at the transmission end due to wear from frictional overheating which is a result of loss of lubrication. The helicopter manufacturer instructions require that the main drive shaft be inspected by a mechanic for loss of lubrication and signs of overheating during a daily inspection before the first flight of each day. The operator did not have records to show that the daily inspection had been performed prior to the accident flight.
The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The inadequate maintenance inspection of the helicopter resulting in loss of lubrication from the main drive shaft going undetected until failure of the drive shaft.
Sources:
https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001208X07802&key=1 Revision history:
Date/time | Contributor | Updates |
27-Sep-2008 01:00 |
ASN archive |
Added |
17-Jan-2009 11:21 |
harro |
Updated |
25-Feb-2020 07:35 |
samfulton08 |
Updated [Narrative] |
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