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ASN Wikibase Occurrence # 31104
Last updated: 2 August 2020
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Date:11-MAR-1997
Time:10:00 EST
Type:Silhouette image of generic UH1 model; specific model in this crash may look slightly different
Bell UH-1B
Owner/operator:Helicorp
Registration: N70696
C/n / msn: 608
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:LaBelle, Florida -   United States of America
Phase: Take off
Nature:Test
Departure airport:
Destination airport:
Investigating agency: NTSB
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/timeContributorUpdates
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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