# NTSB WPR20CA236: Stinson 108, N134C, Farewell Lakes, AK, July 8, 2020 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Data collection · Final report - Date: July 7, 2020, 20:30 local (Jul 8, 2020, 04:30 UTC) - Place: Farewell Lakes, AK - Coordinates: 62.315834, -153.365 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=62.3158&lon=-153.3650&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Defining event: [Takeoff-rejected takeoff: Runway excursion](https://openairdocs.org/ntsb-events/300) - Highest injury: No injuries - Injuries: 2 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): 101661 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR20CA236 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/101661/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=101661 - Page: https://openairdocs.org/ntsb/WPR20CA236 ## Probable cause The pilot's delayed decision to abort the takeoff roll, which resulted in a runway overrun and airplane nose over. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Action: delayed action](https://openairdocs.org/ntsb-findings/02041025): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Universal Stinson 108-2, 2 cases](https://openairdocs.org/ntsb-findings/02041025/cases.md?model=9230416), [All aircraft, 894 cases](https://openairdocs.org/ntsb-findings/02041025/cases.md) - [Object/animal/substance: tree(s)](https://openairdocs.org/ntsb-findings/03022020): Environmental issues › Physical environment · Effect on operation (probable cause); cases with it: [Universal Stinson 108-2, 2 cases](https://openairdocs.org/ntsb-findings/03022020/cases.md?model=9230416), [All aircraft, 933 cases](https://openairdocs.org/ntsb-findings/03022020/cases.md) - [Performance/control parameters](https://openairdocs.org/ntsb-findings/01062000): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Universal Stinson 108-2, 1 case](https://openairdocs.org/ntsb-findings/01062000/cases.md?model=9230416), [All aircraft, 1,269 cases](https://openairdocs.org/ntsb-findings/01062000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Takeoff-rejected takeoff: Runway excursion](https://openairdocs.org/ntsb-events/300) (defining event); cases with it: [Universal Stinson 108-2, 2 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=9230416), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) - [Takeoff-rejected takeoff: Nose over/nose down](https://openairdocs.org/ntsb-events/096); cases with it: [Universal Stinson 108-2, 1 case](https://openairdocs.org/ntsb-events/096/sequence.md?model=9230416), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md) ## Analysis The pilot reported that during the takeoff roll on the soft turf surface private airstrip, the airplane did not accelerate fast enough. About midfield, he aborted the takeoff roll by closing the throttle and he applied the brakes. However, the airplane overran the departure end of the airstrip and the main landing gear collided with a spruce tree stump. The airplane nosed over substantially damaging the rudder and vertical stabilizer. The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation. ## Aircraft - Registration: [N134C](https://openairdocs.org/aircraft/N134C), registered now, S/N 108-3134 (OpenAirDocs) - Reported make and model: Stinson 108 (2) - Registry model: [Universal Stinson 108-2](https://openairdocs.org/model/universal-stinson-108-2) (registry code 9230416) (OpenAirDocs) - Registry engine: [Franklin 6A4165 series](https://openairdocs.org/engine/franklin-6a4165-series) (registry code 27025, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 108-3134 - Year built: 1947 - Airframe hours: 2838.2 - Engines: Franklin 6A4-165-B3 165 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, July 6, 2020 - Departed: MRI, Anchorage, AK - Destination: PVT, Farewell Lake, AK - Flight plan: Company VFR - Airport: PVT, Private Airstrip, runway NW, 1,500 × 50 ft, grass/turf - Equipment: Handheld GPS ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 42; injuries: none; commercial, private; airplane ratings: single-engine sea, single-engine land; medical: class 2, with waivers/limitations; last flight review March 13, 2020; seat: left; restraint: 4-point; flight hours: 5,000 total, 1,500 in this make and model, 4,800 as pilot in command, 150 in the last 90 days, 50 in the last 30 days, 0.5 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: 2,000 ft overcast - Temperature: 55 °F, dew point 50 °F - Altimeter: 29.90 inHg - Observed at: PAFW, 1 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 20200708004799A](https://openairdocs.org/incident/20200708004799A), Jul 8, 2020: Universal Stinson 108-2, Wasilla, AK, Substantial damage. The flight originated on an unmarked airstrip that was unimproved. After preflight, the pilot began his takeoff roll and after half the runway was passed the… ## Other investigations on N134C (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 ANC98LA039](https://openairdocs.org/ntsb/ANC98LA039), Apr 18, 1998: Stinson 108-2 (N134C), Chugiak, AK, substantial damage. Probable cause: The pilot's selection of an unsuitable, slush-covered, runway for landing. A factor was the slush-covered runway. ## Docket (2 files) The files NTSB released with the investigation on July 9, 2021, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=101661. 7.8 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 7.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=11361194&FileExtension=pdf&FileName=6120_1_redacted-Rel.pdf - Photograph (item 2, PDF, 1 page, 227 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12463366&FileExtension=pdf&FileName=Photo-Rel.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.