# NTSB MIA93LA170: Robinson R22 B, N24049, Miami, FL, August 4, 1993

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 4, 1993, 18:34 local (22:34 UTC)
- Place: Miami, FL
- Coordinates: 25.649658, -80.409553 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=25.6497&lon=-80.4096&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report September 26, 1994
- Report: Approved by Office Director
- NTSB case key (mKey): 33283
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA93LA170
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33283/pdf
- Page: https://openairdocs.org/ntsb/MIA93LA170

## Probable cause

THE COMMERCIAL RATED STUDENT PILOT'S FAILURE TO INSURE THE INSTRUCTOR HAD TAKEN CONTROL OF THE HELICOPTER AND THE FLIGHT INSTRUCTORS FAILURE TO PROPERLY SUPERVISE THE STUDENT WHICH RESULTED IN THE STUDENT LETTING GO OF THE CONTROLS WHILE IN A HOVER.

## Sequence of events

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

- Loss of control - in flight, hover
  - relinquishing of control - initiated, dual student (cause)
  - flight controls - not received, pilot in command(cfi) (cause)
  - supervision - improper, pilot in command(cfi) (cause)
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - ground
- Roll over, other

## Analysis

THE COMMERCIAL PILOT RATED STUDENT STATED HE HAD DEMONSTRATED A RAPID DECELERATION MANEUVER FOR THE INSTRUCTOR AND CONCLUDED THE MANEUVER AT 10 TO 15 FEET IN A HOVER. HE MAINTAINED THE HELICOPTER IN A HOVER AND LOOKED TO THE INSTRUCTOR FOR CRITIQUE OF THE MANEUVER. HE FELT A SLIGHT RESISTANCE ON THE FLIGHT CONTROLS AS IF THE INSTRUCTOR HAD TAKEN CONTROL AND THEN HE LET GO OF THE CONTROLS. THE AIRCRAFT BEGAN TO DESCEND AND BEFORE HE REALIZED THE INSTRUCTOR WAS NOT FLYING THE HELICOPTER IT CONTACTED THE GROUND WITH THE SKIDS AND TAIL ROTOR AND ROLLED TO THE RIGHT. THE HELICOPTER THEN CAME TO REST ON ITS RIGHT SIDE. THERE WERE NO REPORTED MECHANICAL FAILURES OF THE HELICOPTER OR SYSTEMS.

## Aircraft

- Registration: N24049 (not matched to a registry record)
- Reported make and model: ROBINSON R22 B
- Category: Helicopter
- Serial number: 0545
- Airframe hours: 2120
- Engines: LYCOMING O-320-B2C 131 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: American Helicopters
- Registered owner: Kimura International Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, July 3, 1993, 20 hours before
- Departed: TMB
- Airport: TMB, Kendall-Tamiami Executive

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 50; flight instructor, commercial; airplane ratings: single-engine land, multi-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 3,311 total, 155 in this make and model, 2,702 as pilot in command, 92 in the last 90 days, 35 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 50° at 8 knots
- Visibility: 6 statute miles
- Lowest ceiling: none
- Temperature: 90 °F, dew point 75 °F
- Altimeter: 30.00 inHg
- Observed at: TMB, 1 nm away

## 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 19930804027689A](https://openairdocs.org/incident/19930804027689A), Aug 4, 1993: Robsin R22BETA, Miami, FL, Substantial damage. Beleived CFI took over control after quick stop manuevers. Student let go helicopter descended. Rolled over.

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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