# NTSB WPR21LA234: Bolstridge Wallace R SKY Raider 1, N8010B, Nampa, ID, June 22, 2021 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: June 21, 2021, 19:08 local (Jun 22, 2021, 01:08 UTC) - Place: Nampa, ID · open field, near airport - Coordinates: 43.596279, -116.53099 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=43.5963&lon=-116.5310&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Defining event: [Approach-VFR pattern downwind: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed - Report: Approved by Office Director - Investigation class: Class 4 - Basic report with no Prelim publish - NTSB office: Western Pacific Region - Parties: FAA - NTSB case key (mKey): 103310 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR21LA234 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/103310/pdf - Page: https://openairdocs.org/ntsb/WPR21LA234 ## Probable cause A total loss of engine power due to the pilot’s failure to premix the two-cycle oil/gasoline mixture, which resulted in a forced landing in a field and collision with terrain. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Fluids: fuel additive](https://openairdocs.org/ntsb-findings/01071040): Aircraft › Fluids/misc hardware · Fluid management (probable cause); cases with it: [Bolstridge Wallace R SKY RAIDER 1, 1 case](https://openairdocs.org/ntsb-findings/01071040/cases.md?model=05622S5), [All aircraft, 4 cases](https://openairdocs.org/ntsb-findings/01071040/cases.md) - [Action: lack of action](https://openairdocs.org/ntsb-findings/02041030): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Bolstridge Wallace R SKY RAIDER 1, 1 case](https://openairdocs.org/ntsb-findings/02041030/cases.md?model=05622S5), [All aircraft, 792 cases](https://openairdocs.org/ntsb-findings/02041030/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Approach-VFR pattern downwind: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) (defining event); cases with it: [Bolstridge Wallace R SKY RAIDER 1, 1 case](https://openairdocs.org/ntsb-events/341/sequence.md?model=05622S5), [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md) - [Emergency descent: Off-field or emergency landing](https://openairdocs.org/ntsb-events/440); cases with it: [Bolstridge Wallace R SKY RAIDER 1, 1 case](https://openairdocs.org/ntsb-events/440/sequence.md?model=05622S5), [All aircraft, 3,365 cases](https://openairdocs.org/ntsb-events/440/sequence.md) ## Analysis The pilot reported that, during preflight, he added five gallons of gasoline into the airplane’s fuel tank. He also measured out the two-cycle engine oil that was to be premixed with the gasoline then set it aside. Shortly after takeoff, and while in the traffic pattern, the engine lost power. The pilot initiated a forced landing in an open field, where the airplane impacted tall grass and nosed over, substantially damaged the left wing. Upon returning to the hangar, the pilot saw the oil he had set aside and realized that it was not added to the gasoline. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. ## Aircraft - Registration: [N8010B](https://openairdocs.org/aircraft/N8010B), registered now, S/N 6139425, built 2000 (OpenAirDocs) - Reported make and model: BOLSTRIDGE WALLACE R SKY RAIDER 1 - Registry model: [Bolstridge Wallace R SKY RAIDER 1](https://openairdocs.org/model/bolstridge-wallace-r-sky-raider-1) (registry code 05622S5) (OpenAirDocs) - Registry engine: [Rotax 447](https://openairdocs.org/engine/rotax-447) (registry code 55576, 2 cycle) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 6139425 - Year built: 2000 - Engines: Rotax 447 40 hp reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Mighuel Hurtado-Tamauo - Registered owner: Bolstridge Wallace R - Airworthiness certificate: Special, Experimental (Special) - Destination: Same as departure - Airport: MAN, Nampa Muni, runway 29, 5,000 × 75 ft, asphalt - Equipment: Unknown ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 51; injuries: none; student; seat: single; restraint: 4-point; flight hours: 500 total, 10 in this make and model, 45 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: 150° at 5 knots - Visibility: 10 statute miles - Temperature: 66 °F, dew point 48 °F - Altimeter: 30.01 inHg - Observed at: KMAN, 1 nm away - METAR: KMAN 211315Z AUTO 15005KT 10SM 19/09 A3001 RMK A01 ## 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 20210621008069A](https://openairdocs.org/incident/20210621008069A), Jun 21, 2021: Bolstridge Wallace R SKY RAIDER 1, Nampa, ID, Substantial damage. Uncertificated pilot departed runway 11 for his first flight in [privacy data omitted] experimental amateur build aircraft (N8010B). After turning left down… 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.