NTSB Identification: FTW90DPJ01.
The docket is stored on NTSB microfiche number 42158.
Accident occurred Wednesday, October 04, 1989 in OKLAHOMA CITY, OK
Probable Cause Approval Date: 07/22/1992
Aircraft: ZIMMERMAN MONI MOTORGLIDER, registration: N15JZ
Injuries: 1 Minor.

THE POWERED GLIDER WAS FLOWN TO ALTITUDE AND THE ENGINE SECURED IN SEARCH OF THERMAL ACTIVITY. AFTER THE INITIAL ENGINE SHUTDOWN, AND UNPOWERED GLIDE, THE ENGINE WAS SUCCESSFULLY RESTARTED. DURING THE SECOND CYCLE, THE PILOT BEGAN AN UNPOWERED DESCENT TO THE AIRPORT. ON FINAL AT ABOUT 400 FEET AGL, THE PILOT REALIZED THAT STRONG HEADWINDS WOULD PREVENT HIM FROM REACHING THE RUNWAY WITHOUT POWER. AN ENGINE START WAS NOT SUCCESSFUL AND FENCE/GROUND IMPACT OCCURRED ABOUT 200 FEET SHORT OF THE THRESHOLD. ENGINE DISASSEMBLY REVEALED DISINTEGRATED MUFFLER BAFFLING, PIECES OF WHICH WERE FREE TO BLOCK THE MUFFLER'S EXIT. AN ANNUAL INSPECTION HAD BEEN PERFORMED ON 8-29-89, 8 FLIGHT HOURS PRIOR TO THE ACCIDENT.

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

POWER LOSS DUE TO THE DETERIORATED MUFFLER BAFFLE WHICH WAS NOT DISCOVERED IN THE RECENT ANNUAL INSPECTION. A FACTOR WAS THE PILOT'S FAILURE TO PROPERLY ANALYZE AND CORRECT FOR THE HEADWIND.

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