# NTSB ANC22LA017: Piper PA-22-150, N23RB, Kasilof, AK, February 5, 2022 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: February 4, 2022, 15:50 local (Feb 5, 2022, 00:50 UTC) - Place: Kasilof, AK - Coordinates: 60.250092, -151.30005 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=60.2501&lon=-151.3000&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-flare/touchdown: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - 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: Alaska Regional Office - Parties: FAA - NTSB case key (mKey): 104635 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC22LA017 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/104635/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=104635 - Page: https://openairdocs.org/ntsb/ANC22LA017 ## Probable cause The pilot’s decision to land on an unmaintained runway surface, which resulted in a loss of control and nose over. ## 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: [Piper PA-22-150, 52 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=7102210), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Info processing/decision: decision making/judgment](https://openairdocs.org/ntsb-findings/02041520): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Piper PA-22-150, 13 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md?model=7102210), [All aircraft, 3,098 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md) - [Runway/land/takeoff/taxi surface: snow/slush/ice covered surface](https://openairdocs.org/ntsb-findings/03023015): Environmental issues › Physical environment · Effect on operation; cases with it: [Piper PA-22-150, 5 cases](https://openairdocs.org/ntsb-findings/03023015/cases.md?model=7102210), [All aircraft, 219 cases](https://openairdocs.org/ntsb-findings/03023015/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing-flare/touchdown: Abnormal runway contact](https://openairdocs.org/ntsb-events/090); cases with it: [Piper PA-22-150, 7 cases](https://openairdocs.org/ntsb-events/090/sequence.md?model=7102210), [All aircraft, 1,506 cases](https://openairdocs.org/ntsb-events/090/sequence.md) - [Landing-flare/touchdown: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Piper PA-22-150, 48 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=7102210), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-flare/touchdown: Nose over/nose down](https://openairdocs.org/ntsb-events/096); cases with it: [Piper PA-22-150, 22 cases](https://openairdocs.org/ntsb-events/096/sequence.md?model=7102210), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md) ## Analysis The pilot reported that on his third pass over the “unplowed” runway, he allowed the main wheels to touch down on the snow. Subsequently, the nosewheel impacted the snow, “folded back”, and the airplane nosed over, coming to rest inverted. The airplane sustained substantial damage to the fuselage and right wing. The pilot reported no preimpact mechanical failures or malfunctions with the airplane that would have precluded normal operation. ## Aircraft - Registration: [N23RB](https://openairdocs.org/aircraft/N23RB), registered now, S/N 22-4108, built 1956 (OpenAirDocs) - Reported make and model: PIPER PA-22-150 - Registry model: [Piper PA-22-150](https://openairdocs.org/model/piper-pa-22-150) (registry code 7102210) (OpenAirDocs) - Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 22-4108 - Year built: 1956 - Airframe hours: 4597.4 - Engines: LYCOMING O-320-A1A 150 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Kenai Aviation Training Academy - Airworthiness certificate: Standard, Utility; Standard, Normal - Last inspection: Annual, September 20, 2021 - Departed: PAEN, Kenai, AK - Airport: 5KS, Kasilof, runway 19, 2,400 × 60 ft, snow - Equipment: ADS-B ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 18; injuries: none; private; airplane ratings: single-engine land; medical: class 3, without waivers/limitations; last flight review June 21, 2021; seat: left; restraint: lap only; flight hours: 160.6 total, 160.6 in this make and model, 124.2 as pilot in command, 41.9 in the last 90 days, 22 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Temperature: 28 °F, dew point 25 °F - Altimeter: 29.51 inHg - Observed at: PASX, 16 nm away - METAR: PASX 050035Z AUTO 00000KT 10SM FEW022 M02/M04 A2951 RMK AO2 P0001 FZRANO ## 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 20220204001399A](https://openairdocs.org/incident/20220204001399A), Feb 4, 2022: Piper PA-22-150, Kasilof, AK, Substantial damage. The pilot was conducting a series of low approaches at Kasilof Airport when he lost control on touchdown resulting in the accident. At the time, the Kasilof… ## Docket (2 files) The files NTSB released with the investigation on August 22, 2022, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=104635. 5.3 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 3.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13809757&FileExtension=pdf&FileName=6120_Redacted-Rel.pdf - Accident pictures (item 2, PDF, 2 pages, 1.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13810547&FileExtension=pdf&FileName=Accident%20pictures_Redacted-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.