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ASN Wikibase Occurrence # 145944
Last updated: 16 September 2021
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Type:Silhouette image of generic B06 model; specific model in this crash may look slightly different
Bell 206B JetRanger III
Owner/operator:J.R. Helicopters Leasing LLC
Registration: N106TV
MSN: 2783
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Location:Flat Top Ranch apple orchard, near Burbank, WA -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:Zillah, WA
Destination airport:Zillah, WA
Investigating agency: NTSB
During an aerial application flight, the single engine helicopter was flying low over an apple orchard when the engine began to lose power. The pilot decreased his airspeed toward zero and performed a hovering autorotation into the orchard. During the landing, the rotor blades impacted the trees, and the tail boom separated from the main fuselage. An examination of the engine revealed that the compressor discharge pressure (PC) air tube, which connected the PC air filter to the power turbine governor was disconnected. The B nut that connected the tube to the PC air filter was present on the tube but not threaded onto the PC air filter boss. The threads on both the PC air filter boss and the B nut did not exhibit any damage or abnormalities. Review of the maintenance records showed that, about 6 hours before the accident, the turbine assembly and bleed valve had been replaced. Removal and reinstallation of the PC air tube was conducted as part of the documented maintenance. It is likely that maintenance personnel did not properly torque the B nut when reinstalling the tube and the loose B nut backed off in-flight. According to the engine manufacturer's technical representative, disconnection of the PC air tube during engine operation would result in a loss of engine power.
Probable Cause: The failure of maintenance personnel to properly torque an air tube fitting, which resulted in a total loss of engine power.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 months
Download report: Final report

Revision history:

31-May-2012 05:34 Anon. Added
31-May-2012 09:25 Geno Updated [Aircraft type, Registration, Cn, Operator, Total occupants, Source, Damage, Narrative]
31-May-2012 09:32 Geno Updated [Registration, Cn, Operator, Source]
04-Jun-2012 16:54 RobertMB Updated [Time, Aircraft type, Location, Source, Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 20:43 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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