CROSS CITY, FL, USA
N4547J
CESSNA T188C
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 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.
Source: NTSB Aviation Accident Database
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