# Structural icing - Type: NTSB defining event - NTSB code: 210 - CICTT category: Icing - Defining event in: 45 cases - In the sequence of: 102 cases - Fatal cases: 20 - All cases: https://openairdocs.org/ntsb-events/210/cases.md - Cases with it anywhere in the sequence: https://openairdocs.org/ntsb-events/210/sequence.md - Page: https://openairdocs.org/ntsb-events/210 ## Cases per year (defining / in the sequence) - 2008: 5 / 7 - 2009: 3 / 7 - 2010: 2 / 6 - 2011: 2 / 7 - 2012: 3 / 8 - 2013: 5 / 11 - 2014: 1 / 6 - 2015: 1 / 3 - 2016: 1 / 4 - 2017: 1 / 2 - 2018: 3 / 8 - 2019: 1 / 4 - 2020: 0 / 2 - 2021: 3 / 5 - 2022: 2 / 4 - 2023: 4 / 7 - 2024: 6 / 7 - 2025: 1 / 2 - 2026: 1 / 2 ## Phase of flight - Enroute-cruise: 17 cases - Enroute: 8 cases - Enroute-descent: 4 cases - Initial climb: 4 cases - Enroute-climb to cruise: 3 cases - Takeoff: 3 cases - Approach-IFR final approach: 1 cases - Approach-IFR initial approach: 1 cases - Approach: 1 cases - Enroute-change of cruise level: 1 cases ## In the probable cause of these cases - [Conducive to structural icing](https://openairdocs.org/ntsb-findings/03031025) (Environmental issues): 29 cases - [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 28 cases - [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 11 cases - [Airspeed](https://openairdocs.org/ntsb-findings/01062010) (Aircraft): 9 cases - [Weather planning](https://openairdocs.org/ntsb-findings/02061020) (Personnel issues): 7 cases - [Freezing rain/sleet](https://openairdocs.org/ntsb-findings/03035040) (Environmental issues): 6 cases - [Altitude](https://openairdocs.org/ntsb-findings/01062012) (Aircraft): 6 cases - [Performance/control parameters, general](https://openairdocs.org/ntsb-findings/01062000) (Aircraft): 6 cases - [Preflight inspection](https://openairdocs.org/ntsb-findings/02061510) (Personnel issues): 4 cases - [Angle of attack](https://openairdocs.org/ntsb-findings/01062042) (Aircraft): 4 cases ## Aircraft models (registry) - [Cirrus Design SR22](https://openairdocs.org/model/cirrus-design-sr22): 3 cases - [Socata TBM 700](https://openairdocs.org/model/socata-tbm-700): 2 cases - [Cessna 208B](https://openairdocs.org/model/cessna-208b): 2 cases - [Piper PA 46-350P](https://openairdocs.org/model/piper-pa-46-350p): 2 cases - [Piper PA-46-310P](https://openairdocs.org/model/piper-pa-46-310p): 1 cases - [Piper PA-32R-301](https://openairdocs.org/model/piper-pa-32r-301): 1 cases - [Piper PA-32-260](https://openairdocs.org/model/piper-pa-32-260): 1 cases - [Piper PA-28-161](https://openairdocs.org/model/piper-pa-28-161): 1 cases - [Piper PA-28R-200](https://openairdocs.org/model/piper-pa-28r-200): 1 cases - [Piper PA-28-181](https://openairdocs.org/model/piper-pa-28-181): 1 cases ## Newest cases - [NTSB WPR26LA126](https://openairdocs.org/ntsb/WPR26LA126), Mar 10, 2026: Cirrus Design SR20 (N619AV), Redington, AZ, substantial damage. Probable cause: The pilot’s improper decision to continue the flight into icing conditions, which resulted in the accumulation of airframe icing and a subsequent aerodynamic stall. - [NTSB ERA25LA111](https://openairdocs.org/ntsb/ERA25LA111), Feb 5, 2025: Cirrus Design SR22 (N406SR), New Lexington, OH, substantial damage. Probable cause: The pilot’s flight into previously forecasted freezing rain, which resulted in ice accretion, reduced forward visibility, and a subsequent landing undershoot. - [NTSB WPR25LA053](https://openairdocs.org/ntsb/WPR25LA053), Dec 2, 2024: Gulfstream AM Corp Comm Div 690D (N29GA), Spokane, WA, substantial damage. Probable cause: A partial loss of engine(s) power due ice ingestion. - [NTSB CEN25LA053](https://openairdocs.org/ntsb/CEN25LA053), Dec 2, 2024: Piper PA-28R-200 (N41997), Boscobel, WI, substantial damage. Probable cause: The ice obstruction of the engine oil breather tube and alternate air outlet, which resulted in a failure of the crankcase oil seal and loss of engine oil. Contributing to the accident was the… - [NTSB WPR25LA029](https://openairdocs.org/ntsb/WPR25LA029), Oct 29, 2024: Daher TBM700 (N885CA), Pinedale, WY, substantial damage. Probable cause: The pilot’s failure to ensure that the airplane was free of snow contamination before takeoff and to follow the manufacturer’s anti-icing procedure during continued snowfall, which resulted in an… - [NTSB WPR24FA124](https://openairdocs.org/ntsb/WPR24FA124), Apr 14, 2024: Gulfstream 695A (N965BC), San Bernardino, CA, destroyed, 1 fatal. Probable cause: The pilot’s continued use of the airplane’s autopilot after flight into moderate to severe icing conditions, which resulted in an exceedance of the airplane’s critical angle of attack and an… - [NTSB ERA24FA176](https://openairdocs.org/ntsb/ERA24FA176), Apr 12, 2024: Piper PA-32R-301 (N9236J), Knoxville, TN, destroyed, 1 fatal. Probable cause: The pilot’s decision to depart into an area of instrument meteorological and icing conditions, which resulted in loss of airplane control and a subsequent in-flight breakup. - [NTSB ERA24LA094](https://openairdocs.org/ntsb/ERA24LA094), Jan 19, 2024: Cessna 208 (N1983X), Dulles, VA, incident, minor damage. Probable cause: The pilot-in-command’s approach to the critical angle of attack during initial climb, which resulted in a vibration the flight crew improperly identified as an engine issue and resulted in the… - [NTSB CEN24FA046](https://openairdocs.org/ntsb/CEN24FA046), Nov 26, 2023: Socata TBM 700 (N850JH), Ludington, MI, destroyed, 2 fatal. Probable cause: The pilot’s decision to take off with ice/snow contamination on the airplane’s wings, which resulted in an aerodynamic stall and impact with terrain. - [NTSB ANC23LA065](https://openairdocs.org/ntsb/ANC23LA065), Aug 27, 2023: Beech B36TC (N6709Q), Cape Yakataga, AK, destroyed, 2 fatal. Probable cause: The pilot’s continued flight into moderate to severe icing conditions, including supercooled large droplets, over mountainous terrain, which resulted in a loss of control and impact with terrain.… NTSB has coded findings and defining events since 2008; earlier cases used its older occurrence and cause codes and aren't counted. Findings: https://openairdocs.org/ntsb-findings.md. Defining events: https://openairdocs.org/ntsb-events.md. Phases of flight: https://openairdocs.org/ntsb-phases.md. Every investigation, filtered by finding, event, phase, state, year or model: https://openairdocs.org/ntsb.md (for example ?state=MI&fatal=1). NTSB's definitions: Accident and incident, 49 CFR 830.2 (https://www.ecfr.gov/current/title-49/subtitle-B/chapter-VIII/part-830/subpart-A/section-830.2), CICTT occurrence categories (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/OccurrenceCategoryDefinitions.pdf), CICTT phases of flight (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/PhaseofFlightDefinitions.pdf), and NTSB coding manual, before 2008 (PDF) (https://www.ntsb.gov/GILS/Documents/codman.pdf). NTSB publishes no definitions for its findings, only their names. --- 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.