# NTSB ANC86LA034: Bell 206B3, N9AT, Livengood, AK, March 10, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 10, 1986, 12:55 local (16:55 UTC)
- Place: Livengood, AK
- Location: 65.5244° N, 148.5447° W: Placed by OpenAirDocs: center of Livengood, AK, within about 9 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=65.5244&lon=-148.5447&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4642
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC86LA034
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4642/pdf
- Page: https://openairdocs.org/ntsb/ANC86LA034

## Analysis

HELICOPTER EXPERIENCED POWER LOSS WHILE FLYING LOW LEVEL PIPELINE PATROL, RESULTING IN A HARD LANDING AND SUBSTANTIAL DAMAGE TO THE ACFT. THE GOVERNING PRESSURE (PG) AIR LINE FITTING WAS FOUND LOOSE ON THE POWER TURBINE FUEL GOVERNOR.

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, cruise - normal
  - fuel system,line - loose (cause)
  - maintenance,service of aircraft/equipment - inattentive, company maintenance personnel (cause)
  - inadequate surveillance,inadequate procedure, company/operator mgmt (contributing factor)
- Forced landing, descent - emergency
- Hard landing, landing - flare/touchdown
  - terrain condition - rough/uneven (contributing factor)

## Aircraft

- Registration: N9AT (not matched to a registry record)
- Reported make and model: BELL 206B3
- Category: Helicopter
- Serial number: 003854
- Airframe hours: 2236
- Engines: ALLISON 250-C20J 400 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Other work use, Part 91
- Operator: Air Logistics Of Alaska
- Registered owner: Heli-Lift Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: AAIP, March 2, 1986, 53 hours before
- Departed: PUMP STATION #7, AK
- Destination: MTF, FAIRBANKS, AK
- Flight plan: Company VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 52; airline transport; instrument ratings: helicopter; medical: class 1, valid medical--no waivers/lim.; seat: right; flight hours: 11,159 total, 5,083 in this make and model, 10,784 as pilot in command, 300 in the last 90 days, 114 in the last 30 days, 8 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 30° at 10 knots
- Visibility: 100 statute miles
- Lowest ceiling: none
- Temperature: 5 °F, dew point -0 °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 19860310005959A](https://openairdocs.org/incident/19860310005959A), Mar 10, 1986: Bell 206B, Livengood, AK, Substantial damage. Power loss during pipeline patrol. Hard landing with severed tail boom. Pg air line nut was loose on the governor.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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