ASN Wikibase Occurrence # 31104
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Date: | Tuesday 11 March 1997 |
Time: | 10:00 |
Type: | Bell UH-1B |
Owner/operator: | Helicorp |
Registration: | N70696 |
MSN: | 608 |
Year of manufacture: | 1962 |
Total airframe hrs: | 7662 hours |
Fatalities: | Fatalities: 0 / Occupants: 1 |
Aircraft damage: | Destroyed |
Category: | Accident |
Location: | LaBelle, Florida -
United States of America
|
Phase: | Take off |
Nature: | Test |
Departure airport: | |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Information is only available from news, social media or unofficial sources |
Narrative:A main rotor blade had been changed during troubleshooting of the main rotor system. While in a hover to track and balance the rotor system, the other main rotor blade and grip separated.
Examination showed the main rotor blade and grip separated due to fatigue cracking of 40 out of 49 main blade strap laminates. The blade that had been changed and did not separate was found to have 26 out of 49 main blade strap laminates separated due to fatigue. The fatigue initiated at the strap pin hole. The main blade straps have a life limit of 1,200 flight hours.
Logbook records showed the main blade straps were installed in the rotor hub assembly during overhaul in Singapore, 640.4 flight hours before failure. The main rotor straps were reported to be new when installed.
Sources:
http://dms.ntsb.gov/aviation/AccidentReports/1yk2wm45cw5gprv555uyhe451/G10312011120000.pdf Revision history:
Date/time | Contributor | Updates |
27-Sep-2008 01:00 |
ASN archive |
Added |
31-Oct-2011 10:24 |
Dr. John Smith |
Updated [Time, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Source, Damage, Narrative] |
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