NTSB Identification: DEN86FA069.
The docket is stored on NTSB microfiche number 30790.
Nonscheduled 14 CFR
Accident occurred Monday, January 27, 1986 in MISSOULA, MT
Probable Cause Approval Date: 06/18/1987
Aircraft: BELL 206L-1, registration: N5019K
Injuries: 3 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE HELICOPTER, EQUIPPED WITH LANDING SKID SNOW PADS, WAS PARKED ON A NARROW RAMP EXTENSION TO A ROOF TOP HELIPAD THAT WAS SURROUNDED BY A CONCRETE CURB. UPON TAKEOFF TO A HOVER, THE RIGHT SNOW PAD STRUCK AND BECAME MOMENTARTILY CAUGHT ON BOLTS PROTRUDING FROM THE TOP OF THE CURB LOCATED ON THE RIGHT SIDE OF THE HELICOPTER, RESULTING IN A RIGHT ROLLING ACTION OF THE HELICOPTER. THE LIFT FORCES BENT THE SNOW PAD, SUDDENLY DISENGAGING IT FROM THE BOLTS, AT WHICH TIME THE ACFT SUDDENLY ACCELERATED TOWARD A BUILDING. AS THE PILOT WAS ATTEMPTING TO REGAIN CONTROL TO AVOID IMPACT WITH THE BUILDING, THE TAIL ROTOR STRUCK THE ROOF TOP AND ANTI-TORQUE CONTROL WAS LOST. THE ACFT SPUN TO THE RIGHT UNTIL IMPACT ON THE HELIPAD.

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

OBJECT..AIRPORT FACILITY

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

DIRECTIONAL CONTROL..NOT POSSIBLE..PILOT IN COMMAND

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

AIRPORT/FACILITIES..INADEQUATE

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

FACILITY,INADEQUATE MANUALS/DIRECTIVES..COMPANY/OPERATOR MANAGEMENT



Contributing Factors

PRESSURE..COMPANY/OPERATOR MANAGEMENT

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