NTSB Identification: LAX86LA358.
The docket is stored on NTSB microfiche number 32592.
Accident occurred Tuesday, September 30, 1986 in CHINO, CA
Aircraft: BELLANCA 8GCBC, registration: N87020
Injuries: 1 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 GROUND LOOPED IN A FRESHLY PLOWED FIELD DURING A FORCED LANDING AFTER COMPLETING A BANNER TOW OPERATION. THE PLT INDICATED THAT HE HAD JUST ENTERED A DOWNWIND TRAFFIC PATTERN FOR THE BANNER RELEASE AREA WHEN THE ENG BEGAN TO RUN ROUGH AND LOSE POWER. HE MOVED THE MIXTURE CONTROL TO THE FULL RICH POSITION AND PUMPED THE THROTTLE. THE ENG REGAINED POWER MOMENTARILY AND THEN QUIT. THE ACFT WAS APRX 600 FT AGL AND THE PLT DECIDED NOT TO ATTEMPT A RESTART. HE RELEASED THE BANNER AND LANDED INTO THE WIND ON A FRESHLY PLOWED FIELD. THE ACFT'S RIGHT MAIN LANDING GEAR COLLAPSED ON LANDING ROLL. THE ACFT WAS TRANSPORTED TO THE ARPT AND THE ENG WAS RUN WITHOUT INCIDENT AND WAS CAPABLE OF PRODUCING FULL POWER. IT WAS NOTED THAT THE FLAME TUBE LOCATED IN THE ACFT'S MUFFLER SYSTEM WAS DISINTEGRATING. IT WAS SUSPECTED THAT THE PIECES OF THE FLAME TUBE MAY HAVE BLOCKED THE MUFFLER OUTLET, BUT THE MALFUNCTION COULD NOT BE DUPLICATED.

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

REASON FOR OCCURRENCE UNDETERMINED


Contributing Factors

TERRAIN CONDITION..ROUGH/UNEVEN


Contributing Factors

TERRAIN CONDITION..SOFT


Contributing Factors

LOAD JETTISON..PERFORMED..PILOT IN COMMAND


Contributing Factors

ALTITUDE..INADEQUATE..PILOT IN COMMAND


Contributing Factors

GROUND LOOP/SWERVE..INADVERTENT..PILOT IN COMMAND

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