# NTSB NYC82DA206: Bell 206L-1, N57480, Ho Ho Kus, NJ, August 21, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: August 21, 1982, 09:25 local (13:25 UTC)
- Place: Ho Ho Kus, NJ
- Location: 40.9995° N, 74.0966° W: Placed by OpenAirDocs: center of Ho-Ho-Kus, NJ, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.9995&lon=-74.0966&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report August 21, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 71038
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC82DA206
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/71038/pdf
- Page: https://openairdocs.org/ntsb/NYC82DA206

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, cruise - normal
  - turbine assembly,nozzle - failure,total (cause)
- Forced landing, landing - flare/touchdown
  - autorotation - performed, pilot in command (contributing factor)

## Analysis

WHILE IN STRAIGHT AND LEVEL FLIGHT AT 1000 FT, THE PILOT HEARD A "POP" IN THE ENGINE AREA. HE NOTED THAT THE TURBINE OUTLET TEMPERATURE (TOT) BEGAN AN IMMEDIATE RISE TO THE HIGH YELLOW AREA INITIALLY, THE POWER WAS REDUCED TO 50% TORQUE AND THE TOT RETURNED TO THE GREEN ARC. THE PILOT STARTED TO DIVERT, BUT AFTER ABOUT 20 TO 30 SEC, THE TOT BEGAN RISING AGAIN, SO THE TORQUE WAS REDUCED TO 30%. THE HELICOPTER WAS OVER AN AREA OF TREES, BUT THE PILOT SAW A CULDESAC. AS HE WAS APPROACHING TO LAND, THE TOT BECAME UNCONTROLLABLE AND THE ENGINE WAS SHUT DOWN. AN AUTOROTATION WAS COMPLETED IN A TAIL LOW ATTITUDE TO PREVENT A GROUND RUN. DURING TOUCHDOWN, THE TAILBOOM WAS SEVERED AFT OF THE HORIZONTAL STABILIZER. DISASSEMBLY OF THE ENGINE REVEALED THAT THE SECOND STAGE TURBINE NOZZLE, PN 6893952, HAD SEPARATED FROM THE VANE PORTION OF THE NOZZLE.

## Aircraft

- Registration: [N57480](https://openairdocs.org/deregistered/N57480-1985-10-25), registration cancelled 1985-10-25, S/N 45501 (OpenAirDocs)
- Reported make and model: BELL 206L-1
- Registry model: [Bell Helicopter Textron 206L-1](https://openairdocs.org/model/bell-helicopter-textron-206l-1) (registry code 1182107) (OpenAirDocs)
- Category: Helicopter
- Serial number: 45501
- Airframe hours: 746
- Engines: ALLISON 250C28B 420 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Business, Part 91
- Operator: Emar Associates
- Registered owner: Emar Associates
- Departed: MOONACHIE, NJ
- Destination: MOONACHIE, NJ

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 37; commercial; airplane ratings: single-engine land; medical: class 1, valid medical--w/ waivers/lim; flight hours: 5,174 total, 471 in this make and model, 2,508 as pilot in command, 116 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 350° at 12 knots
- Visibility: 15 statute miles
- Temperature: 156 °F
- Altimeter: 29.00 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 19820821040069A](https://openairdocs.org/incident/19820821040069A), Aug 21, 1982: Bell 206L1, Hohokus, NJ, Substantial damage. Turbine assembly guide vane failed. Helicopter was substantially damaged in the hard autorotation landing.

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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