NTSB Identification: CHI85LA110.
The docket is stored on NTSB microfiche number 27491.
Accident occurred Monday, February 18, 1985 in HUNTINGBURG, IN
Aircraft: Brantly Helicopter B-2, registration: N511R
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 EXPERIENCED A PARTIAL POWER LOSS AND MADE A HARD AUTOROTATIVE LNDG DURING A TRAINING FLT. INVESTIGATION OF THE ENG REVEALED MISTIMING OF THE LEFT MAG. THE ENG DURING TESTS ALSO RAN HOT UNTIL THE ADDITION OF A COOLING SHROUD. THE OTHER SIGNIFICANT FINDING IN THE ENG WAS THE OUT OF PROPER CLEARENCE SETTING OF THE #1 INTAKE VALUE. THE CYLINDERS HAD LESS THAN 2 HRS RUNNING TIME SINCE INSTALLATION SO THEY WERE NOT YET'SEATED IN'. THE PISTON PINS AND CAPS WERE WORN AND APPARENTLY NOT REPLACED DURING THE NEW CYLINDER INSTALATION. ;

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

MAINTENANCE,ADJUSTMENT..IMPROPER..OTHER MAINTENANCE PERSONNEL

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

AUTOROTATION..MISJUDGED..PILOT IN COMMAND(CFI)


Contributing Factors

EXHAUST SYSTEM,MANIFOLD/PIPE..FAILURE,PARTIAL

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