# NTSB WPR23LA260: Cessna 170B, N1664D, Fremont Island, UT, July 7, 2023 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: July 7, 2023, 17:00 local (23:00 UTC) - Place: Fremont Island, UT - Coordinates: 41.166767, -112.36427 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=41.1668&lon=-112.3643&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - 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): 192576 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR23LA260 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/192576/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=192576 - Page: https://openairdocs.org/ntsb/WPR23LA260 ## Probable cause The pilot undergoing instruction’s excessive application of asymmetrical braking during landing, which resulted in a ground loop. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Cessna 170B, 91 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=2072306), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Cessna 170B, 74 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=2072306), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Cessna 170B, 84 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=2072306), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) ## Analysis According to the flight instructor, during the landing roll the pilot undergoing instruction applied asymmetrical braking and locked the left brake. This led to a ground loop. The airplane sustained substantial damage to the right wing. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. ## Aircraft - Registration: [N1664D](https://openairdocs.org/aircraft/N1664D), registered now, S/N 20306 (OpenAirDocs) - Reported make and model: CESSNA 170B - Registry model: [Cessna 170B](https://openairdocs.org/model/cessna-170b) (registry code 2072306) (OpenAirDocs) - Registry engine: [Continental C145 series](https://openairdocs.org/engine/continental-c145-series) (registry code 17012, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 20306 - Airframe hours: 4146.11 - Engines: Continental O-300 reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Scud Air Solutions LLC - Registered owner: Scud Air Solutions LLC - Airworthiness certificate: Standard, Normal - Last inspection: 100 hour, May 13, 2023 - Departed: KOGD, Ogden, UT - Destination: KOGD, Ogden, UT - Airport: 89D, Freemont Island Lower, runway 09, 1,828 × 10 ft, gravel - Equipment: ADS-B, Video recording device, Handheld GPS, Stall warning system ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 39; injuries: none; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, with waivers/limitations; last flight review August 31, 2022; seat: right; restraint: lap only; flight hours: 5,890 total, 295 in this make and model, 3,610 as pilot in command, 118 in the last 90 days, 29 in the last 30 days, 4 in the last 24 hours - Pilot; age 40; injuries: none; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, without waivers/limitations; last flight review September 16, 2021; seat: left; restraint: lap only; flight hours: 424 total, 8 in this make and model ## Weather - Conditions: Visual (VMC), Day - Temperature: 93 °F, dew point 34 °F - Altimeter: 29.85 inHg - Observed at: KOGD, 16 nm away - METAR: METAR KOGD 072253Z VRB05KT 10SM CLR 34/01 A2985 ## 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 20230707011689A](https://openairdocs.org/incident/20230707011689A), Jul 7, 2023: Cessna 170B, Hooper, UT, Substantial damage. The student was on his last flight to receive his tail wheel endorsement and was reported as being proficient and prepared to land on a remote backcountry dirt… ## Docket (2 files) The files NTSB released with the investigation on January 4, 2024, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=192576. 2.3 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 11 pages, 2.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16434721&FileExtension=pdf&FileName=6120%20N1664D_Redacted-Rel.pdf - Photos (item 2, PDF, 2 pages, 245 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16495127&FileExtension=pdf&FileName=N1664D%20Accident%20Photo-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.