# NTSB ERA23LA172: Helicopteres Guimbal Cabri G2, N242JL, Clarksville, TN, March 29, 2023 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Class 4 · Limited · Final report - Date: March 29, 2023, 12:15 local (17:15 UTC) - Place: Clarksville, TN - Coordinates: 36.621861, -87.414944 - Nearby events: https://openairdocs.org/map.md?lat=36.6219&lon=-87.4149&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Defining event: [Maneuvering-hover: Dynamic rollover](https://openairdocs.org/ntsb-events/231) - Highest injury: Minor injuries - Injuries: 2 minor - Status: Completed - Report: Approved by Office Director - Investigation class: Class 4 - Basic report with no Prelim publish - NTSB office: Eastern Region Aviation - Parties: FAA/FSDO - NTSB case key (mKey): 106977 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ERA23LA172 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/106977/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=106977 - Page: https://openairdocs.org/ntsb/ERA23LA172 ## Probable cause The flight instructor’s inadequate remedial action following an abrupt control input by the student pilot, which resulted in abnormal contact with the ground and a dynamic rollover. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Action: lack of action](https://openairdocs.org/ntsb-findings/02041030): Personnel issues › Action/decision · Instructor/check pilot (probable cause); cases with it: [All aircraft, 792 cases](https://openairdocs.org/ntsb-findings/02041030/cases.md) - [Performance/control parameters: pitch control](https://openairdocs.org/ntsb-findings/01062022): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [All aircraft, 526 cases](https://openairdocs.org/ntsb-findings/01062022/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Maneuvering-hover: Dynamic rollover](https://openairdocs.org/ntsb-events/231) (defining event); cases with it: [All aircraft, 161 cases](https://openairdocs.org/ntsb-events/231/sequence.md) ## Analysis The flight instructor of the helicopter reported that the student pilot was taking his second lesson, learning to hover over a grass area at the airport. The flight instructor was operating the collective and anti-torque pedals, while the student pilot was operating the cyclic. The student pilot made an abrupt rearward movement with the cyclic. The flight instructor increased throttle and raised the collected to gain height; however, the right rear skid contacted the ground, resulting in a dynamic rollover. The flight instructor added that there were no preimpact mechanical malfunctions with the helicopter and that in the future, he should initiate hover training at a higher height. Examination of the helicopter by a Federal Aviation Administration inspector revealed substantial damage to the main rotor blades, fuselage, and tailboom. ## Aircraft - Registration: N242JL (not matched to a registry record) - Reported make and model: HELICOPTERES GUIMBAL CABRI G2 - Category: Helicopter - Serial number: 1319 - Year built: 2023 - Airframe hours: 24 - Engines: Lycoming O-360 180 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Austin Peay State University - Registered owner: Rotor Leasing LLC - Airworthiness certificate: Standard, Normal - Last inspection: Annual, March 22, 2023, 10 hours before - Airport: CKV, Outlaw Field - Equipment: ADS-B, Electronic primary flight display, Electronic multifunction display ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 40; injuries: minor; commercial, flight instructor; instrument ratings: helicopter; medical: class 2, without waivers/limitations; last flight review February 2, 2023; seat: left; restraint: 4-point; flight hours: 320 total, 200 in this make and model, 252 as pilot in command, 57 in the last 90 days, 18 in the last 30 days, 4 in the last 24 hours - Student pilot; age 30; injuries: minor; student; medical: class 2, without waivers/limitations; seat: right; restraint: 4-point; flight hours: 2 total, 2 in this make and model, 0 as pilot in command, 2 in the last 90 days, 2 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 70° at 4 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 55 °F, dew point 28 °F - Altimeter: 30.31 inHg - Observed at: CKV - METAR: KCKV 291652Z AUTO 07004KT 10SM CLR 13/M02 A3031 ## 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 20230329005629A](https://openairdocs.org/incident/20230329005629A), Mar 29, 2023: Helicopteres Guimbal CABRI G2, Clarksville, TN, Substantial damage. During hover training, instructor gave control of the cyclic to the student. The student made an abrupt aft cyclic input causing tail to impact the ground… ## Docket (3 files) The files NTSB released with the investigation on June 29, 2023, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=106977. 2.2 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 11 pages, 1.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15322929&FileExtension=pdf&FileName=6120_Redacted-Rel.pdf - Weather report (item 2, PDF, 1 page, 174 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15322107&FileExtension=pdf&FileName=Metars-Rel.pdf - Photo (item 3, PDF, 1 page, 366 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15323493&FileExtension=pdf&FileName=Photo-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.