NTSB Identification: LAX84LA117.
The docket is stored on NTSB microfiche number 22966.
Accident occurred Tuesday, December 27, 1983 in MOUNTAIN CITY, NV
Aircraft: BELL 206B III, registration: N206JH
Injuries: 2 Serious,1 Minor.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FUEL SYSTEM,PUMP..IMPROPER

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

MAINTENANCE,REPLACEMENT..IMPROPER..OTHER MAINTENANCE PERSONNEL


Contributing Factors

WEATHER CONDITION..SNOW


Contributing Factors

TERRAIN CONDITION..SNOW COVERED

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