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ASN Wikibase Occurrence # 140477
Last updated: 26 September 2017
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Date:02-APR-1994
Time:
Type:Silhouette image of generic R44 model; specific model in this crash may look slightly different
Robinson R44 Astro
Owner/operator:private
Registration: D-HTOP
C/n / msn: 0013
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Airplane damage: Written off (damaged beyond repair)
Location:ca 8 mi E of Hannover -   Germany
Phase: En route
Nature:Passenger
Departure airport:
Destination airport:
Narrative:
Crashed during intended pleasure flight. The investigation has revealed that the main rotor blades struck the cockpit area of the fuselage.

The evidence indicates that the helicopter yawed sharply due to the blade strike, and the structure of the tail boom wrinkled and then failed, resulting in separation of the tail boom. The main rotor mast shows evidence of being bumped by the main rotor blades, and the main rotor system separated from the helicopter. No precipitating mechanical failure of the helicopter was found.

The investigation did not determine the reason for the main rotor blade divergence that resulted in the rotor striking the body of the helicopter during powered flight.

At least three German-registered Robinson R44s - D-HTOP, D-HPHS, and D-HFSD - were lost in circumstances similar to the above, and the NTSB report confirmed that there were a near-identical problem with the main rotor in all three cases.

Sources:

http://www.helionline.net/templates/sites/casualties.html
http://www.rotorspot.nl/product/r44.htm
http://www.rotorshop.com/sir9603.pdf
http://www.libertyhelicopters.co.uk/NTSB_Special%20Report/NTSB_R44Reports/Hanover_Germany.htm


Revision history:

Date/timeContributorUpdates
18-Dec-2011 20:06 Dr. John Smith Added
06-Sep-2014 18:30 TB Updated [Aircraft type, Operator, Location, Source, Narrative]

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