NTSB Identification: LAX83LA312.
The docket is stored on NTSB microfiche number 23200.
Accident occurred Thursday, June 30, 1983 in OCOTILLO, CA
Aircraft: BELL 204B, registration: N1WA
Injuries: 2 Uninjured.

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 ACFT WAS ON AN EXTERNAL LOAD OPERATION TO AIRLIFT LOADS OF CEMENT. THE CEMENT WAS BEING POURED FOR BASE PILINGS FOR POWER LINE TOWERS ON ROUGH TERRAIN. WHILE CARRYING A 3100 LB LOAD OF CEMENT ON A 40 FT LINE, THE HELICOPTER HAD JUST MOVED TO A POSITION TO START POURING. WHILE STABLIZED IN A HOVER, THE PLT HEARD 3 COMPRESSOR STALLS. THE HELICOPTER YAWED & BEGAN LOSING ALTITUDE. THE PLT MOVED THE ACFT FORWARD FOR THE SAFETY OF WORKERS BELOW. THE PLT CONTINUED FORWARD, RELEASED THE EXTERNAL LOAD, CONTINUED AN AUTOROTATION INTO A RAVINE & LANDED ON SOFT, UNEVEN GROUND. PRIOR TO TOUCHDOWN, THE HELICOPTER BEGAN MAKING UNCONTROLLABLE TURNS. THE MAIN ROTOR STRUCK A LARGE BOULDER. SHORTLY AFTER LANDING, A FIRE ERUPTED IN THE ENG COMPARTMENT WHICH SUBSEQUENTLY COSUMED THE HELICOPTER. AN EXAM OF THE WRECKAGE, INCLUDING THE ENG, REVEALED NO PREIMPACT, MECHANICAL PROBLEM. THE PINION GEAR OF THE 90 DEG GEAR BOX EXHIBITED SOME BACKLASH WEAR. THE ELEVATION OF THE CRASH SITE WAS APRX 3000 FT.

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

REASON FOR OCCURRENCE UNDETERMINED



Contributing Factors

OBJECT..OTHER PERSON


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

TERRAIN CONDITION..ROUGH/UNEVEN


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