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LAX84LA117 · Bell 206B III

27 Dec 1983 · MOUNTAIN CITY, NV, United States

Idaho Helicopters Bell 206B III · Accident: total loss of engine power (mechanical failure) while maneuvering

From Boise, ID to MOUNTAIN CITY, NV

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Event

NTSB case
LAX84LA117
Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
Accident
InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
Completed
API-reported fatalities
0 · all aircraft and ground
Ground fatalities
0
OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
General aviation
WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
Instrument Meteorological Cond

Bell 206B III

Aircraft type
Bell 206
Category
Helicopter
RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
N206JH
Onboard fatalities
Unknown
Route
From Boise, IDTo MOUNTAIN CITY, NV
Aircraft age
Not recorded
Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
Part 91: General Aviation
Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
Maneuvering
First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
Total loss of engine power (mechanical failure)
DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
Substantial

Cause areas

  • Fuel system, pump › Improper
  • Other maintenance personnel › Maintenance, replacement, improper

Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.

NTSB narrative

THE HELICOPTER COLLIDED WITH THE SNOW COVERED GROUND AFTER THE ENG QUIT DURING A POWER-LINE PATROL AT ABOUT 30 FT AGL. THE PLT REPORTED THAT THE VISIBILITY WAS 1/2 MILE WITH LIGHT SNOW FALLING. HE ALSO SAID HE COULD SEE 4 TO 7 OF THE SUPPORTING STRUCTURES. THESE POLES ARE SPACED ABOUT 350 FT APART SO SEVEN POLES TOTALS LESS THAN 1/2 MILE. THE BELL 206BFLT MANUAL STATES THAT 'OPERATIONS ARE PERMITTED IN FALLING SNOW WHEN VISIBILITY IS IN EXCESS OF 1/2 MILE, BUT FLT DURATION IS LIMITED TO 1 AND 1/2 HOURS.' INVESTIGATION OF THE ENGINE AFTER THE ACCIDENT REVEALED THAT WHEN THE TOP PLUG OF THE FUEL PUMP FILTER WAS LOOSENED, THE SOUND OF ESCAPING AIR WAS NOTED. INVESTIGATION ALSO REVEALED THAT ON THE DAY OF THE ACCIDENT THE FORWARD FUEL BOOST PUMP HAD BEEN REPLACED WITH A NEW IC-38-L TYPE PUMP WHICH HAD BEEN SIGNED OFF AS HAVING BEEN CHECKED FOR PRESSURE AND BLED.

Verbatim NTSB analysis from the NTSB dataset

Sources

NTSB record LAX84LA117
Event ID
20001214X45343
Case number
LAX84LA117
Dataset
historical-pre2008
Source SHA-256
89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
  • Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
  • Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
  • The date is the local date, which is the same as the UTC date the NTSB stores.
  • API snapshot SHA-256: a16a71bba054da505f8740a1b30403c81d788be8c8cbe70ea8fadf1d91a06ca3; retrieved 2026-09-21T17:43:08.870Z.