NTSB Identification: MIA85LA237.
The docket is stored on NTSB microfiche number 29276.
Accident occurred Thursday, August 22, 1985 in PANAMA CITY BCH, FL
Aircraft: BELL 47D1, registration: N4253A
Injuries: 2 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 CONTACTED A FENCE AND SLID NOSE DOWN INTO A RAVINE DURING A FORCED LANDING. THE PLT REPORTED THAT AFTER TAKEOFF AT AN ALT OF 35 TO 40 FT AGL, A LOAD BANG WAS HEARD AND GRAY/WHITE SMOKE WAS EMITTED FROM THE TRANSMISSION/ENG AREA. THE THROTTLE WAS ROLLED OFF AND COLLECTIVE LOWERED FOR THE FORCED LANDING. POST ACCIDENT INSPECTION OF THE ENG REVEALED 11 SPARK PLUGS WERE MISFIRING AND THE RIGHT MAGNETO 'P' LEAD HAD SHORTED OUT ON THE ENG CASE.

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

IGNITION SYSTEM,MAGNETO..SHORTED

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

IGNITION SYSTEM,SPARK PLUG..INOPERATIVE

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

MAINTENANCE,INSPECTION..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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