# NTSB WPR22LA155: Cessna 170B, N2929D, Boise, ID, April 17, 2022 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: April 17, 2022, 11:45 local (17:45 UTC) - Place: Boise, ID - Coordinates: 43.56685, -116.23285 - Nearby events: https://openairdocs.org/map.md?lat=43.5669&lon=-116.2328&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: Federal Aviation Administration - NTSB case key (mKey): 104957 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR22LA155 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/104957/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=104957 - Page: https://openairdocs.org/ntsb/WPR22LA155 ## Probable cause The pilot receiving instructions failure to maintain directional control during landing. Contributing to the accident was the flight instructor’s delayed remedial action. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Action: delayed action](https://openairdocs.org/ntsb-findings/02041025): Personnel issues › Action/decision · Instructor/check pilot; cases with it: [All aircraft, 894 cases](https://openairdocs.org/ntsb-findings/02041025/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: [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) ## Analysis The flight instructor reported that, the pilot receiving instruction performed a wheel landing in the tailwheel equipped airplane. During the landing roll, with the tailwheel still off the ground, the airplane drifted left, which was counteracted with right rudder control. Shortly after, the right wing suddenly lifted, and the airplane veered to the right. Despite left rudder input, the airplane ground looped to the right. During the ground loop, the left main landing gear axle bolts broke, and the left wing was substantially damaged when it struck the ground. The flight instructor reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. He added that he felt the loss of control was due to a dust devil. At the time of the accident, the pilot was landing the airplane on runway 10R with wind from 180° at 4 knots. ## Aircraft - Registration: N2929D (not matched to a registry record) - Reported make and model: CESSNA 170B - Category: Airplane - Serial number: 26872 - Year built: 1956 - Airframe hours: 5173 - Engines: Lycoming IO-360-M1B 180 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Registered owner: Green Kyle R - Airworthiness certificate: Standard, Normal - Last inspection: Annual, December 5, 2021, 5 hours before - Airport: BOI, Boise Air Terminal, runway 10R, 9,763 × 150 ft, asphalt - Equipment: Onboard weather, Electronic flight bag or handheld device, ADS-B ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 63; injuries: none; airline transport, commercial, flight instructor; airplane ratings: multi-engine land, single-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review March 10, 2022; seat: right; restraint: 4-point; flight hours: 7,152 total, 900 in this make and model, 7,071 as pilot in command, 73 in the last 90 days, 14 in the last 30 days, 5 in the last 24 hours - Pilot; age 50; injuries: none; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; last flight review March 12, 2021; seat: left; restraint: 4-point; flight hours: 268.6 total, 4.5 in this make and model, 18.3 as pilot in command, 5.8 in the last 90 days, 5.8 in the last 30 days, 2.1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 180° at 4 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 46 °F, dew point 21 °F - Altimeter: 30.29 inHg - Observed at: KBOI - METAR: KBOI 171753Z 18004KT 10SM CLR 08/M06 A3029 RMK AO2 SLP265 T00781061 10083 21011 51009 $ ## 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 20220417006069A](https://openairdocs.org/incident/20220417006069A), Apr 17, 2022: Cessna 170B, Boise, ID, Substantial damage. On April 17, 2022, at approximately 11:42 hours MDT, a Cessna model 170B single engine aircraft was substantially damaged after loss of directional control… ## Docket (2 files) The files NTSB released with the investigation on July 8, 2022, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=104957. 18.4 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 10 pages, 18.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13758206&FileExtension=pdf&FileName=N2929D%206120_Redacted-Rel.pdf - Photo array (item 2, PDF, 1 page, 1 photo, 252 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13758711&FileExtension=pdf&FileName=Photo%201-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.