# NTSB CEN24LA070: Helicopteres Guimbal Cabri G2, N522TF, Claremore, OK, November 8, 2023

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: November 8, 2023, 12:45 local (18:45 UTC)
- Place: Claremore, OK
- Coordinates: 36.376111, -95.705278 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=36.3761&lon=-95.7053&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing: Hard landing](https://openairdocs.org/ntsb-events/092)
- 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: Central Region
- Parties: FAA FSDO
- NTSB case key (mKey): 193547
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN24LA070
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/193547/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=193547
- Page: https://openairdocs.org/ntsb/CEN24LA070

## Probable cause

The flight instructor’s failure to maintain sufficient rotor speed during a practice autorotation which resulted in a hard landing.

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Use of equip/info: use of equip/system](https://openairdocs.org/ntsb-findings/02063015): Personnel issues › Task performance · Instructor/check pilot (probable cause); cases with it: [Helicopteres Guimbal CABRI G2, 1 case](https://openairdocs.org/ntsb-findings/02063015/cases.md?model=9000001), [All aircraft, 1,391 cases](https://openairdocs.org/ntsb-findings/02063015/cases.md)
- [Action: delayed action](https://openairdocs.org/ntsb-findings/02041025): Personnel issues › Action/decision · Instructor/check pilot (probable cause); cases with it: [Helicopteres Guimbal CABRI G2, 5 cases](https://openairdocs.org/ntsb-findings/02041025/cases.md?model=9000001), [All aircraft, 894 cases](https://openairdocs.org/ntsb-findings/02041025/cases.md)
- [Performance/control parameters: landing flare](https://openairdocs.org/ntsb-findings/01062041): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Helicopteres Guimbal CABRI G2, 2 cases](https://openairdocs.org/ntsb-findings/01062041/cases.md?model=9000001), [All aircraft, 1,285 cases](https://openairdocs.org/ntsb-findings/01062041/cases.md)

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Landing: Hard landing](https://openairdocs.org/ntsb-events/092) (defining event); cases with it: [Helicopteres Guimbal CABRI G2, 1 case](https://openairdocs.org/ntsb-events/092/sequence.md?model=9000001), [All aircraft, 2,102 cases](https://openairdocs.org/ntsb-events/092/sequence.md)

## Analysis

The student pilot and flight instructor initiated a 90° practice autorotation. As the helicopter descended, the flight instructor took control of the helicopter to cushion the landing after the student pilot flared too high. During the attempted recovery, sufficient rotor speed was not maintained, and the helicopter experienced a hard landing. The helicopter sustained substantial damage to the tailboom. Both the student pilot and the flight instructor reported that there were no preaccident mechanical malfunctions or failures that would have precluded normal operations.

## Aircraft

- Registration: [N522TF](https://openairdocs.org/aircraft/N522TF), registered now, S/N 1314, built 2022 (OpenAirDocs)
- Reported make and model: HELICOPTERES GUIMBAL CABRI G2
- Registry model: [Helicopteres Guimbal CABRI G2](https://openairdocs.org/model/helicopteres-guimbal-cabri-g2) (registry code 9000001) (OpenAirDocs)
- Registry engine: [Lycoming O-360-J2A](https://openairdocs.org/engine/lycoming-o-360-j2a) (registry code 42314, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 1314
- Year built: 2022
- Airframe hours: 346
- Engines: Lycoming O-360-J2A 165 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Registered owner: Truflight Helicopter Academy LLC
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, August 11, 2023
- Departed: O38, Owasso, OK
- Destination: Same as departure
- Airport: OK15, Avian Country Estates Airport, runway 17, 2,600 × 100 ft, grass/turf
- Equipment: ADS-B, Electronic multifunction display, Electronic primary flight display

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Flight instructor; age 36; injuries: none; commercial, private, flight instructor; airplane ratings: single-engine land; instrument ratings: helicopter; medical: class 2, without waivers/limitations; last flight review June 14, 2023; seat: left; restraint: 4-point; flight hours: 1,200 total, 350 in this make and model, 600 as pilot in command, 182 in the last 90 days, 68 in the last 30 days, 1 in the last 24 hours
- Student pilot; age 57; injuries: none; private; airplane ratings: single-engine sea, single-engine land; medical: class 2, without waivers/limitations; last flight review November 30, 2023; seat: right; restraint: 4-point; flight hours: 161 total, 39 in this make and model, 46 in the last 90 days, 8 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 220° at 16 knots
- Temperature: 32 °F, dew point 32 °F
- METAR: GCM 081835Z AUTO 22016KTS 10SM CLR 29/15 A2970

## 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 20231108019439A](https://openairdocs.org/incident/20231108019439A), Nov 8, 2023: Helicopteres Guimbal CABRI G2, Claremore, OK, Substantial damage. On 11/8/2023 cabri G2 training flight in a was conducted with CFI and student. Aircraft departed airnav: O38-GUNDY'S airport to practice autos and off airport…

## Docket (3 files)

The files NTSB released with the investigation on April 19, 2024, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=193547. 8.7 MB in all.

- NTSB form 6120 pilot operator report student pilot CEN24LA070 (item 1, PDF, 9 pages, 3.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16944759&FileExtension=pdf&FileName=NTSB%20Form%206120%20Pilot%20Operator%20Report%20Student%20Pilot%20CEN24LA070_Redacted-Rel.pdf
- NTSB form 6120 pilot operator report flight instructor CEN24LA070 (item 2, PDF, 9 pages, 3.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16946381&FileExtension=pdf&FileName=NTSB%20Form%206120%20Pilot%20Operator%20Report%20Flight%20Instructor%20CEN24LA070_Redacted-Rel.pdf
- Investigation photographs 1 CEN24LA070 (item 3, PDF, 4 pages, 1.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16952512&FileExtension=pdf&FileName=Investigation%20Photographs%201%20CEN24LA070-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.

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