# NTSB WPR10CA410: Gulfstream-Schweizer A/C Gulfstream AM G-164B, N8150K, Genesee, ID, August 18, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: August 18, 2010, 08:00 local (15:00 UTC) - Place: Genesee, ID - Coordinates: 46.608055, -116.817779 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=46.6081&lon=-116.8178&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Defining event: [Maneuvering-low-alt flying: Low altitude operation/event](https://openairdocs.org/ntsb-events/220) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report March 16, 2011 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: FAA Spokane FSDO - NTSB case key (mKey): 77002 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR10CA410 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/77002/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=77002 - Page: https://openairdocs.org/ntsb/WPR10CA410 ## Probable cause The pilot’s failure to maintain clearance from terrain during low-altitude maneuvering. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Terrain](https://openairdocs.org/ntsb-findings/03021000): Environmental issues › Physical environment · Response/compensation (probable cause); cases with it: [Gulfstream-Schweizer A/C GULFSTREAM AM G-164B, 3 cases](https://openairdocs.org/ntsb-findings/03021000/cases.md?model=3979904), [All aircraft, 267 cases](https://openairdocs.org/ntsb-findings/03021000/cases.md) - [Info processing/decision: decision making/judgment](https://openairdocs.org/ntsb-findings/02041520): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Gulfstream-Schweizer A/C GULFSTREAM AM G-164B, 1 case](https://openairdocs.org/ntsb-findings/02041520/cases.md?model=3979904), [All aircraft, 3,098 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md) - [Performance/control parameters: altitude](https://openairdocs.org/ntsb-findings/01062012): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Gulfstream-Schweizer A/C GULFSTREAM AM G-164B, 4 cases](https://openairdocs.org/ntsb-findings/01062012/cases.md?model=3979904), [All aircraft, 1,310 cases](https://openairdocs.org/ntsb-findings/01062012/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Maneuvering-low-alt flying: Low altitude operation/event](https://openairdocs.org/ntsb-events/220) (defining event); cases with it: [Gulfstream-Schweizer A/C GULFSTREAM AM G-164B, 3 cases](https://openairdocs.org/ntsb-events/220/sequence.md?model=3979904), [All aircraft, 780 cases](https://openairdocs.org/ntsb-events/220/sequence.md) ## Analysis The pilot reported that during an aerial application flight he was spraying a mature wheat field along north-facing hillsides. As the pilot finished his last pass, he flew west along the steep hillsides. A strong gust of wind struck the airplane and the left wing dropped into the wheat. Subsequently, the airplane spun and cartwheeled in the wheat field before coming to a rest; the fuselage and empennage were substantially damaged. The pilot reported no mechanical failures or malfunctions with the airframe or engine prior to the accident. ## Factual narrative The pilot reported that during an aerial application flight he was spraying a mature wheat field along north facing hillsides. As the pilot finished his last pass he flew west along the steep hillsides. A strong gust of wind struck the airplane and the left wing dropped into the wheat. Subsequently, the airplane spun and cartwheeled in the wheat field before coming to a rest; the fuselage and empennage were substantially damaged. The pilot reported no mechanical failures or malfunctions with the airframe or engine prior to the accident. ## Aircraft - Registration: [N8150K](https://openairdocs.org/aircraft/N8150K), registered now, S/N 587B, built 1979 (OpenAirDocs) - Reported make and model: GULFSTREAM-SCHWEIZER A/C CORP GULFSTREAM AM G-164B - Registry model: [Gulfstream-Schweizer A/C GULFSTREAM AM G-164B](https://openairdocs.org/model/gulfstream-schweizer-a-c-gulfstream-am-g-164b) (registry code 3979904) (OpenAirDocs) - Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 587B - Airframe hours: 12603 - Engines: P&W R1340 SERIES 600 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Operator: Fountain Flying Service LLC - Registered owner: Fountain Flying Service LLC - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, April 14, 2010, 300 hours before - Departed: PVT, Genesee, ID - Destination: PVT, Genesee, ID ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 40; injuries: none; commercial; airplane ratings: single-engine land; medical: class 2, without waivers/limitations; last flight review February 21, 2010; seat: single; flight hours: 7,600 total, 3,000 in this make and model, 7,600 as pilot in command, 350 in the last 90 days, 100 in the last 30 days, 0 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 180° at 4 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 79 °F, dew point 37 °F - Altimeter: 29.81 inHg - Observed at: KLWS, 10 nm away ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20100818041289A](https://openairdocs.org/incident/20100818041289A), Aug 18, 2010: Gulfstream- GULFSTREAM, Genesee, ID, Substantial damage. Pilot performing aerial application to spot spray thistles in wheat field. Pilot stated on final application in rising terrain a sudden wind gust caused left… ## Other investigations on N8150K (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB FTW88DRA08](https://openairdocs.org/ntsb/FTW88DRA08), Apr 2, 1988: Grumman G-164 (N8150K), Palacios, TX, substantial damage ## Docket (1 files) The files NTSB released with the investigation on October 6, 2010, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=77002. 483 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 483 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40335225&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.