# NTSB MIA87LA190: Bell 47G-2, N6772D, Miami, FL, June 20, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 20, 1987, 18:50 local (22:50 UTC)
- Place: Miami, FL
- Coordinates: 25.909662, -80.270431 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=25.9097&lon=-80.2704&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report October 7, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 31933
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA87LA190
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/31933/pdf
- Page: https://openairdocs.org/ntsb/MIA87LA190

## Sequence of events

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

- Airframe/component/system failure/malfunction, maneuvering
  - rotorcraft flight control,swashplate assembly - failure,partial (cause)
  - rotorcraft flight control,swashplate assembly - disconnected (cause)
- Forced landing, descent - emergency
- Hard landing, landing - flare/touchdown
  - flare - not possible, pilot in command(cfi) (cause)

## Analysis

THE INSTRUCTOR PLT STATED THAT THE HELICOPTER BEGAN TO VIBRATE WHILE THE STUDENT PLT WAS MANEUVERING IT DURING AN INSTRUCTIONAL FLT. THE INSTRUCTOR PLT THEN EXECUTED A FORCED LANDING AND UPON TOUCHDOWN THE MAIN ROTOR BLADES CONTACTED THE GROUND. INSPECTION OF THE HELICOPTER REVEALED THAT THE BOLT WHICH ATTACHES ONE SIDE OF THE SWASHPLATE TO THE SCISSOR ASSY BROKE RESULTING IN THE LOSS OF PITCH CONTROL OF THE MAIN ROTOR BLADES.

## Aircraft

- Registration: [N6772D](https://openairdocs.org/deregistered/N6772D-1991-03-29), registration cancelled 1991-03-29, S/N 2256 (OpenAirDocs)
- Reported make and model: BELL 47G-2
- Registry model: [Bell 47G-2](https://openairdocs.org/model/bell-47g-2) (registry code 1181008) (OpenAirDocs)
- Category: Helicopter
- Serial number: 2256
- Airframe hours: 8459
- Engines: LYCOMING VO-435-A1D 260 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: Kimura International
- Registered owner: Toyoshi Kimura
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, April 8, 1987, 20 hours before
- Airport: OPF, Opa Locka, runway 9, 8,002 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 27; flight instructor, commercial; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 2,300 total, 2,031 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: 120° at 8 knots
- Visibility: 12 statute miles
- Lowest ceiling: 20,000 ft broken
- Altimeter: 30.00 inHg
- Observed at: OPF

## 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 19870620034009A](https://openairdocs.org/incident/19870620034009A), Jun 20, 1987: Bell 47G2, Miami, FL, Substantial damage. Vibration at 300 feet over airport due to broken swashplate to scissor yoke bolt. Main rotors hit ground on landing

## Other investigations on N6772D (1)

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.

- [NTSB CHI68A0062](https://openairdocs.org/ntsb/CHI68A0062), Jan 16, 1968: Bell 47G-2 (N6772D), Delta, OH, substantial damage

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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