# Dynamic rollover

- Type: NTSB defining event
- NTSB code: 231
- CICTT category: Loss Of Control (Ground)
- Defining event in: 102 cases
- In the sequence of: 161 cases
- Fatal cases: 6
- All cases: https://openairdocs.org/ntsb-events/231/cases.md
- Cases with it anywhere in the sequence: https://openairdocs.org/ntsb-events/231/sequence.md
- Page: https://openairdocs.org/ntsb-events/231

## Cases per year (defining / in the sequence)

- 2008: 1 / 1
- 2009: 5 / 12
- 2010: 8 / 9
- 2011: 7 / 8
- 2012: 6 / 10
- 2013: 1 / 2
- 2014: 8 / 14
- 2015: 1 / 6
- 2016: 4 / 8
- 2017: 10 / 12
- 2018: 4 / 8
- 2019: 6 / 14
- 2020: 6 / 6
- 2021: 3 / 3
- 2022: 11 / 16
- 2023: 2 / 6
- 2024: 6 / 9
- 2025: 7 / 10
- 2026: 6 / 7

## Phase of flight

- Takeoff: 30 cases
- Maneuvering-hover: 26 cases
- Landing: 22 cases
- Landing-flare/touchdown: 13 cases
- Standing-engine(s) operating: 3 cases
- Taxi: 2 cases
- Landing-aborted after touchdown: 1 cases
- Landing-landing roll: 1 cases
- Takeoff-rejected takeoff: 1 cases
- Standing-engine(s) shutdown: 1 cases

## In the probable cause of these cases

- [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 71 cases
- [Lateral/bank control](https://openairdocs.org/ntsb-findings/01062023) (Aircraft): 36 cases
- [Altitude](https://openairdocs.org/ntsb-findings/01062012) (Aircraft): 14 cases
- [Performance/control parameters, general](https://openairdocs.org/ntsb-findings/01062000) (Aircraft): 11 cases
- [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 9 cases
- [Delayed action](https://openairdocs.org/ntsb-findings/02041025) (Personnel issues): 9 cases
- [Incorrect action performance](https://openairdocs.org/ntsb-findings/02041015) (Personnel issues): 8 cases
- [Directional control](https://openairdocs.org/ntsb-findings/01062020) (Aircraft): 7 cases
- [Gusts](https://openairdocs.org/ntsb-findings/03034045) (Environmental issues): 6 cases
- [Monitoring environment](https://openairdocs.org/ntsb-findings/02021545) (Personnel issues): 6 cases

## Aircraft models (registry)

- [Robinson Helicopter R22 BETA](https://openairdocs.org/model/robinson-helicopter-r22-beta): 18 cases
- [Robinson Helicopter R44 II](https://openairdocs.org/model/robinson-helicopter-r44-ii): 9 cases
- [Bell 206B](https://openairdocs.org/model/bell-206b): 9 cases
- [Robinson Helicopter R44](https://openairdocs.org/model/robinson-helicopter-r44): 7 cases
- [Robinson Helicopter R22](https://openairdocs.org/model/robinson-helicopter-r22): 3 cases
- [Bell Helicopter Textron 206L-1](https://openairdocs.org/model/bell-helicopter-textron-206l-1): 3 cases
- [Bell OH-58A](https://openairdocs.org/model/bell-oh-58a): 3 cases
- [Eurocopter AS 350 B3](https://openairdocs.org/model/eurocopter-as-350-b3): 2 cases
- [Schweizer 269C-1](https://openairdocs.org/model/schweizer-269c-1): 2 cases
- [Mcdonnell Douglas Helicopter 369E](https://openairdocs.org/model/mcdonnell-douglas-helicopter-369e): 2 cases

## Newest cases

- [NTSB ERA26LA304](https://openairdocs.org/ntsb/ERA26LA304), Aug 15, 2026: Robinson Helicopter R22 Beta (N8316N), Miramar, FL, substantial damage. Probable cause: The flight instructor’s failure to maintain control of the helicopter during a hover, which resulted in the left skid contacting ground and a subsequent dynamic rollover.
- [NTSB ERA26LA274](https://openairdocs.org/ntsb/ERA26LA274), Jul 14, 2026: Robinson R22 (N30CH), Monroe, NC, substantial damage, investigation ongoing
- [NTSB ANC26LA051](https://openairdocs.org/ntsb/ANC26LA051), Jun 13, 2026: Robinson R44 (N336SG), Pembroke Pines, FL, substantial damage, investigation ongoing
- [NTSB CEN26LA203](https://openairdocs.org/ntsb/CEN26LA203), May 27, 2026: Robinson Helicopter R66 (N5488H), Fort Worth, TX, substantial damage. Probable cause: The flight instructor’s delayed remedial action and the student pilot’s failure to maintain helicopter control during hover.
- [NTSB WPR26LA188](https://openairdocs.org/ntsb/WPR26LA188), May 14, 2026: Mcdonnell Douglas Helicopter 500 (N952SF), Twin Falls, ID, substantial damage. Probable cause: The pilot’s failure to maintain control while hovering in gusty wind conditions, resulting in the helicopter rolling onto its side.
- [NTSB WPR26LA146](https://openairdocs.org/ntsb/WPR26LA146), Apr 4, 2026: Bell Helicopter Textron 206L-1 (N5017G), Chimney Rock, MT, substantial damage. Probable cause: The pilot’s failure to maintain adequate clearance from the terrain while performing a low altitude circling takeoff maneuver, which resulted in a dynamic rollover.
- [NTSB CEN25LA337](https://openairdocs.org/ntsb/CEN25LA337), Aug 23, 2025: Bell OH-58A (N707EE), Caseville, MI, substantial damage. Probable cause: The front seat passenger’s inadvertent movement of the cyclic control resulting in a dynamic rollover after landing. Contributing to the accident was the pilot’s decision to leave the dual flight…
- [NTSB ERA25LA282](https://openairdocs.org/ntsb/ERA25LA282), Jul 30, 2025: Paul Dennis Berg Exec 162F (N843WB), Holley, NY, substantial damage. Probable cause: The pilot’s failure to maintain clearance with the ground while hovering, which resulted in a dynamic rollover.
- [NTSB CEN25LA167](https://openairdocs.org/ntsb/CEN25LA167), Apr 30, 2025: Bell Helicopter Textron Canada 505 (N9TV), Bethany, OK, substantial damage. Probable cause: The pilot’s improper landing technique that allowed the helicopter’s right skid to get caught on the landing platform, which resulted in a dynamic rollover.
- [NTSB ERA25LA160](https://openairdocs.org/ntsb/ERA25LA160), Mar 28, 2025: Rotorway Exec (N8318A), Chuluota, FL, substantial damage. Probable cause: The pilot’s failure to maintain lateral control of the helicopter during takeoff, which resulted in a dynamic rollover.

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.

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