# NTSB NYC86LA168: Bell 206B III, N1068Y, Moultonboro, NH, June 28, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 28, 1986, 09:15 local (13:15 UTC)
- Place: Moultonboro, NH
- Location: 43.7548° N, 71.3967° W: Placed by OpenAirDocs: center of Moultonborough, NH, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.7548&lon=-71.3967&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report April 25, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 30372
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC86LA168
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/30372/pdf
- Page: https://openairdocs.org/ntsb/NYC86LA168

## Sequence of events

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

- In flight collision with object, descent - normal
  - rotor system,tail rotor blade - separation (cause)
  - rotor drive system,tail rotor gearbox(90 deg) - separation (cause)
  - autorotation - initiated, pilot in command
- Loss of control - in flight, descent - emergency
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - mountainous/hilly

## Analysis

THE BELL JET RANGER HAD JUST DROPPED OFF AN EXTERNAL LOAD AND WAS RETURNING DOWNHILL WHEN THE PILOT REPORTED HEARING A GROWLING NOISE IN THE AFT PORTION OF THE AIRCRAFT. HE AUTOROTATED TO LANDING AS CONTROL WAS LOST. WHEN THE WRECKAGE WAS EXAMINED AFTER IT HAD BEEN REMOVED FROM THE SCENE OF THE ACCIDENT, IT WAS NOTED THAT THE TAIL ROTOR GEAR BOX WAS OUT OF THE AIRFRAME AND ONE TAIL ROTOR BLADE WAS MISSING. EXAMINATION OF THE REMAINING TAIL ROTOR STUB BY THE NTSB LAB SHOWED THE FAILURE WAS OPPOSITE THE NORMAL DIRECTION OF ROTATION. WHAT THE TAIL ROTOR STRUCK WAS NOT DETERMINED. ROTATION OF THE 90 DEGREE GEARBOX REVEALED THERE WAS NO BINDING.

## Aircraft

- Registration: [N1068Y](https://openairdocs.org/deregistered/N1068Y-1989-06-12), registration cancelled 1989-06-12, S/N 2845 (OpenAirDocs)
- Reported make and model: BELL 206B III
- Registry model: [Bell 206B](https://openairdocs.org/model/bell-206b) (registry code 1181511) (OpenAirDocs)
- Category: Helicopter
- Serial number: 206
- Airframe hours: 1852
- Engines: ALLISON 250-C-20B 317 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Other work use, Part 133
- Operator: Joe Brigha, Inc.
- Registered owner: Corporate Helicopters, Inc.
- Airworthiness certificate: Standard, Normal

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 25; commercial, flight instructor; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: right; flight hours: 4,390 total, 945 in this make and model, 4,300 as pilot in command, 138 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 230° at 8 knots
- Visibility: 5 statute miles
- Lowest ceiling: none
- Temperature: 79 °F
- Altimeter: 30.00 inHg

## 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 19860628028169A](https://openairdocs.org/incident/19860628028169A), Jun 28, 1986: Bell 206B, Moultonboro, NH, Substantial damage. The helicopter impacted the ground out of control. One tail rotor failed in overstress due to undetermined causes.

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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