NTSB Identification: MIA92LA126.
The docket is stored on NTSB microfiche number 46942.
Accident occurred Sunday, May 24, 1992 in CROSS CITY, FL
Probable Cause Approval Date: 03/24/1993
Aircraft: CESSNA T188C, registration: N4547J
Injuries: 1 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.

FLIGHT EXPERIENCED ENGINE FAILURE SHORTLY AFTER SWITCHING TO THE CHEMICAL HOPPER WHICH HAD BEEN CONVERTED TO A FUEL TANK FOR THE FERRY FLIGHT. THE ENGINE COULD NOT BE RESTARTED AND A FORCED LANDING WAS MADE IN A WOODED AREA. POST CRASH OPERATION OF THE ENGINE REVEALED THE ENGINE WOULD NOT RUN ON THE ENGINE DRIVEN FUEL PUMP. AFTER THE PUMP WAS CHANGED THE ENGINE OPERATED NORMALLY. THE ENGINE DRIVEN PUMP WAS FOUND TO CONTAIN BLACK RUBBER PARTICLE CONTAMINATION UNDER THE BYPASS VALVE AND TO BE WORN WHICH PREVENTED PRESSURE BUILD UP. THE HOPPER TANK LINE ENTERED THE AIRFRAME FUEL SYSTEM AFTER THE ELECTRIC BOOST PUMP AND THE ONLY SOURCE OF HOPPER TANK FUEL PRESSURE WAS THE ENGINE DRIVEN PUMP.

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

THE INADEQUATE INSPECTION FOR CONTAMINATION OF THE AIRCRAFT FUEL SYSTEM AFTER MODIFICATION RESULTING IN FAILURE OF THE ENGINE DRIVEN FUEL PUMP DUE TO CONTAMINATION. CONTRIBUTING TO THE ACCIDENT WAS THE IMPROPER MODIFICATION OF THE FUEL SYSTEM WHICH RESULTED IN THE HOPPER FUEL TANK NOT HAVING A SECOND SOURCE OF FUEL PUMPING.

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