NTSB Identification: DEN87FA237.
The docket is stored on NTSB microfiche number 35265.
Accident occurred Sunday, September 13, 1987 in PINEDALE, WY
Probable Cause Approval Date: 05/16/1989
Aircraft: FAIRCHILD HILLER FH-1100, registration: N5059F
Injuries: 3 Serious.

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 PLT AND TWO PASSENGERS HAD FLOWN TO PINEDALE TO FISH. THE PLT STATED THAT HE WAS CRUISING AT AN ALT OF 400 FT AGL AND WAS EXECUTING A RT TURN AT THE REQUEST OF A PAX. HE STATED THAT HE SLOWED THE ACFT, DECREASED THE COLLECTIVE, AND ADDED RT PEDAL AS HE ENTERED THE TURN. THE ACFT BEGAN TO DESCEND RAPIDLY SO HE ATMPTD TO CORRECT WITH FULL COLLECTIVE AND AFT CYCLIC CTL, BUT THE ACFT IMPACTED THE GND. THE POSTCRASH EXAM OF THE WRECKAGE REVEALED NO EVIDENCE OF A MECH MALFUNCTION OR FAILURE PRIOR TO THE ACC. THE DENSITY ALT WAS CALCULATED TO BE 9,553 FT. THE BASIC HELICOPTER HANDBOOK STATES THAT TURNS ARE ENTERED FROM STRAIGHT AND LVL FLT BY APPLYING SIDEWARD PRESSURE ON THE CYCLIC. IT ALSO SAYS THAT THIS IS THE ONLY CTL MOVEMENT NECESSARY TO START THE TURN AND THAT PEDALS SHOULD NOT BE USED TO ASSIST THE TURN. WITNESSES INDICATED THAT THE ACFT HAD BEEN FLYING LOW OVER THE AREA THROUGHOUT THE WEEKEND.

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

IN-FLIGHT PLANNING/DECISION..IMPROPER..PILOT IN COMMAND

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

ROTORCRAFT FLIGHT CONTROLS..IMPROPER USE OF..PILOT IN COMMAND

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

REMEDIAL ACTION..INADEQUATE..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

LOW PASS..INTENTIONAL..PILOT IN COMMAND


Contributing Factors

LACK OF TOTAL EXPERIENCE..PILOT IN COMMAND


Contributing Factors

LACK OF FAMILIARITY WITH GEOGRAPHIC AREA..PILOT IN COMMAND

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