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ASN Wikibase Occurrence # 37559
Last updated: 23 August 2019
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Date:10-MAY-1986
Time:12:24
Type:Silhouette image of generic R22 model; specific model in this crash may look slightly different
Robinson R22 Alpha
Owner/operator:Dad's Air
Registration: N8511Z
C/n / msn: 0415
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:East Fishkill, New York -   United States of America
Phase: En route
Nature:Private
Departure airport:Hyde Park, Poughkeepsie, New York (POU/KPOU)
Destination airport:Danbury, Connecticut (DXR/KDXR)
Investigating agency: NTSB
Narrative:
On May 10, 1986, at approximately 12:24 EDT (Eastern Daylight Time), a Robinson R22 Alpha, N8511Z, broke up in flight at East Fishkill, New York, while on a visual flight rules (VFR) flight from Hyde Park, New York, to Danbury, Connecticut. The pilot had departed Hyde Park about 12:12 EDT. The helicopter was destroyed and the commercial certificated pilot was killed.

The last entry in the pilot's logbook indicated that he had accumulated 435 total flight hours, 67 of which were in
helicopters and 61 in the R22. A helicopter pilot who had witnessed the R22's departure requested the tower to inform N8511Z that the helicopter's cowl door was open in the back and to land the helicopter. The pilot of N8511Z acknowledged but continued the flight.

Witnesses to the crash reported a loud "pop" and seeing pieces falling from the helicopter. The severed section of tailboom was the first piece of the helicopter along the 584-foot long wreckage path. The main wreckage exhibited evidence that a main rotor blade had struck the tailboom at several locations. The main rotor assembly was separated from the mast at the top of the transmission and was located next to the fuselage. A cabin door and pieces of plexiglass were found 15 feet southwest of the main wreckage.

Parts of the wreckage were examined by a Safety Board metallurgist for evidence of possible preimpact failure of a control system or flight component that might have initiated the breakup. The examination of the top of the transmission case and lower main rotor mast revealed signatures typical of overstress separation.

The upper main rotor shaft also exhibited features typical of a bending overstress separation. One of the pitch change links was fractured at the lower rod end, and the other remained attached to the fractured swashplate arm. Both fracture surfaces exhibited evidence of overstress separations. Examination of the main rotor spindles revealed deformed tusks on each spindle consistent with the blades traveling beyond the design limits. The droop stops were also found crushed and deformed and exhibited the effects of repeated pounding

Sources:

1. NTSB Identification: NYC86FA127 at http://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001213X33670&key=1&queryId=27abd545-b819-4845-9ad0-287f232c5cce&pgsize=100
2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=8511Z
3. http://www.griffin-helicopters.co.uk/accidentdetails.aspx?accidentkey=35783
4. http://planecrashmap.com/plane/ny/N8511Z/


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
07-Feb-2016 22:23 Dr.John Smith Updated [Time, Aircraft type, Departure airport, Destination airport, Source, Narrative]
18-Sep-2016 18:33 Dr.John Smith Updated [Location, Departure airport, Destination airport, Source, Narrative]
18-Sep-2016 19:29 Dr.John Smith Updated [Source]
21-Dec-2016 19:23 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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