# NTSB MIA04CA059: Robinson R22, N4370D, Keystone, FL, March 12, 2004

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Data collection · Final report
- Date: March 12, 2004, 09:30 local (14:30 UTC)
- Place: Keystone, FL
- Coordinates: 29.844722, -82.0475
- Nearby events: https://openairdocs.org/map.md?lat=29.8447&lon=-82.0475&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report June 2, 2004
- Report: Approved by Office Director
- NTSB case key (mKey): 58923
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA04CA059
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/58923/pdf
- Page: https://openairdocs.org/ntsb/MIA04CA059

## Probable cause

The inadequate supervision by the flight instructor by allowing the student to lose excessive altitude resulting in a skid impacting the ground and subsequent roll over of the helicopter.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Roll over, maneuvering
  - altitude - not maintained, dual student
  - supervision - inadequate, pilot in command(cfi) (cause)
  - dynamic rollover - inadvertent
  - terrain condition - soft

## Analysis

The certified flight instructor decided to let the student perform one more steep turn before returning to the hangar. On the last steep turn the student lost more altitude than on previous maneuvers. The instructor took over the controls; however, the helicopter touched down right skid lower than the left with forward left lateral movement resulting in a roll over of the helicopter. The flight instructor stated there were no mechanical failures or malfunctions to the helicopter or any of its systems prior to the accident.

## Factual narrative

On March 12, 2004, about 0930 eastern standard time, a Robinson R22, N4370D, registered to and operated by Collective Helicopters Corporation, as a Title 14 CFR Part 91 instructional flight, rolled over while practicing maneuvers at the Keystone Airpark, Keystone Heights, Florida. Visual meteorological conditions prevailed and no flight plan was filed. The instructor-rated pilot and student pilot received no injuries, and the helicopter incurred substantial damage. The flight originated from Keystone Airpark, Florida earlier that day.

The certified flight instructor stated that he had his student complete several steep turn maneuvers earlier in the practice session and decided to let him perform one more before returning back to the hangar. On the last steep turn the student lost more altitude then on previous maneuvers. According to the instructor he took over the controls; however, the helicopter touched down right skid lower than the left with forward left lateral movement resulting in the helicopter rolling over on to the ground. The flight instructor stated there were no mechanical failures or malfunctions to the helicopter or any of its systems prior to the accident.

## Aircraft

- Registration: [N4370D](https://openairdocs.org/deregistered/N4370D-2004-11-24), registration cancelled 2004-11-24, S/N 1583, built 1990 (OpenAirDocs)
- Reported make and model: Robinson R22
- Registry model: [Robinson Helicopter R22 BETA](https://openairdocs.org/model/robinson-helicopter-r22-beta) (registry code 7640110) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 1583
- Engines: Avco Lycoming O-320-B2C reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: Collective Helicopter Corp, doing business as Wings and Rotors
- Registered owner: Collective Helicopters Corp.
- Airworthiness certificate: Standard, Normal
- Departed: 42J, Keystone, FL
- Destination: 42J, Keystone, FL
- Airport: 42J, Keystone Height Airstrip

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Flight instructor; age 26; injuries: none; flight instructor; instrument ratings: helicopter; medical: class 1; last flight review December 20, 2003; flight hours: 320 total, 315 in this make and model, 77 in the last 90 days, 40 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Lowest ceiling: none
- Temperature: 59 °F, dew point 43 °F
- Altimeter: 30.25 inHg
- Observed at: KGNV

## 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 20040312016749A](https://openairdocs.org/incident/20040312016749A), Mar 12, 2004: Robsin R22BETA, Keystone Height, FL, Substantial damage. (-23) Instructor with commercial student were practicing air taxi manuevers at 50 ft AGL, at 50 KTS, while executing a right hand turn they suffered a sudden…

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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