20000627039859A

(.4)DURING TAKEOFF, THE ENGINE STARTED TO 'COUGH' AND WOULD NOT PRODUCE ENOUGH POWER TO MAINTAIN FLIGHT. THE PILOT LANDED THE SINGLE-ENGINE AIRPLANE ON THE REMAINING RUNWAY; HOWEVER, THE AIRPLANE OVERRAN THE RUNWAY AND IMPACTED A DITCH AND BUSHES. THE PILOT REPORTED THAT A SIMILAR ENGINE EVENT OCCURRED A FEW WEEKS PRIOR TO THE ACCIDENT, AND AS A RESULT, A MECHANIC REPLACED THE ENGINE DRIVEN FUEL PUMP. AN ENGINE TEST RUN WAS CONDUCTED AFTER THE ACCIDENT WITH THE SECOND FUEL PUMP INSTALLED. NO ANOMALIES WERE NOTED DURING THE TEST RUN. BOTH THE FIRST AND SECOND FUEL PUMPS WERE INSPECTED, LEAK CHECKED, AND FLOW TESTED AT THE ENGINE MANUFACTURER'S FACILITY. THE FIRST FUEL PUMP DID CONTAIN AN AIR LEAK; HOWEVER, THE SECOND FUEL PUMP, WHICH WAS INSTALLED ON THE ENGINE AT THE TIME OF THE ACCIDENT, DID NOT DISPLAY ANY ANOMALIES THAT WOULD HAVE PREVENTED ITS OPERATION ON THE AIRPLANE. THE SECOND FUEL PUMP WAS REINSTALLED ON THE ENGINE, AND THE ENGINE WAS REINSTALLED ON THE AIRPLANE. AFTER REDELIVERY OF THE AIRPLANE, THE ENGINE LOST POWER DURING TAXI OPERATIONS. THE MECHANIC REMOVED AND REPLACED THE SECOND FUEL PUMP WITH A THIRD PUMP AND ADJUSTED THE FUEL INJECTOR SETTINGS. THE SECOND ENGINE DRIVEN FUEL PUMP WAS TESTED A SECOND TIME WITH SIMILAR RESULTS AS THE FIRST TEST. NO ANOMALIES HAVE OCCURRED WITH THE ENGINE SINCE THE FUEL INJECTOR ADJUSTMENT. (-23) THE PILOT TOLD THE OKLAHOMA HIGHWAY PATROL TROOPER, HE LANDED AT TALIHINA AIRPORT DUE TO AN ENGINE MALFUNCTION, THEN LOST POWER DURING HIS ATTEMPT TO TAKE OFF. THE AIRCRAFT SKIDDED OFF THE SOUTH END OF THE RUNWAY ABOUT 100 YARDS AND ACROSS A 6 TO 8 FOOT WIDE CREEK AND STOPPED IN SOME TALL TREES. THERE WAS NO FIRE AND THE PILOT SUFFERED MINOR INJURY. ^PRIVACY DATA OMITTED^ IP. THE MAXIMUM TAKEOFF POWER FUEL FLOW INDICATED 23.1 GALLONS/HOUR. NO ANOMALIES WERE NOTED DURING THE TEST RUN. THE ORIGINAL FUEL PUMP, S/N J069918B, WAS SENT TO THE MANUFACTURER FOR TESTING ON OCTOBER 19, 2000, AND WAS FOUND TO HAVE AN AIR LEAK, WHICH ALLOWED "AIR TO BE SUCKED INTO THE INLET CAUSING VAPOR AND THE POSSIBILITY OF CAVITATING THE PUMP OUTLET." THE AIRPLANE WAS THEN TAKEN TO THE MOONEY AIRCRAFT CORPORATION MANUFACTURING FACILITY IN KERRVILLE, TEXAS, FOR REPAIRS. IN THE INTERIM, THE ENGINE WAS SENT TO MATTITUCK AVIATION IN MATTITUCK, NEW YORK, FOR OVERHAUL. DURING THE OVERHAUL, MATTITUCK MECHANICS SENT THE ENGINE DRIVEN FUEL PUMP, S/N C210024B, TO THE ENGINE MANUFACTURER'S FACILITY FOR A FLOW TEST. ON NOVEMBER 22, 2000, THE FUEL PUMP WAS INSPECTED, LEAK TESTED, AND FLOW TESTED. THE ONLY ANOMALY NOTED WAS THE FUEL PUMP CALIBRATION, WHICH RESULTED IN A HIGHER DISCHARGE PRESSURE THAN SPECIFIED BY THE MANUFACTURER. THE ENGINE MANUFACTURER REPRESENTATIVE STATED THAT THE FUEL PUMPS ARE ADJUSTED ON THE AIRCRAFT AND "THE PUMP FLOW...COULD HAVE BEEN RE-ADJUSTED TO MEET PRODUCTION SPECIFICATIONS." HE ADDED THAT IT WAS A "NORMAL" FLOW TEST RESULT. THE FUEL PUMP WAS SHIPPED T R MATTITUCK AND THE ENGINE WAS REASSEMBLED AND SHIPPED TO MOONEY'S FACILITY FOR PLACEMENT ON N22166. THE AIRPLANE, WITH THE ORIGINAL ENGINE INSTALLED, WAS RE-DELIVERED TO THE OWNER. UPON RE-DELIVERY, IT WAS NOTED THAT THE AUTOPILOT TRIM SYSTEM MALFUNCTIONED. THE OWNER REQUESTED THAT A MECHANIC TEST THE SYSTEM. THE MECHANIC STATED THAT WHILE HE WAS TAXIING TO THE RUNWAY TO TEST THE AUTOPILOT SYSTEM, THE ENGINE LOST POWER. HE ADDED THAT THE ONLY WAY THE ENGINE WOULD MAINTAIN POWER WHILE ON THE GROUND WAS WITH THE ELECTRIC BOOST PUMP ON. THE MECHANIC RETURNED THE AIRPLANE TO THE HANGAR AND REMOVED THE ENGINE DRIVEN FUEL PUMP. THE MECHANIC SENT THE ENGINE DRIVEN FUEL PUMP, S/N C210024B, TO THE NTSB IIC, AND THE NTSB IIC TOOK THE FUEL PUMP TO THE MANUFACTURER'S FACILITY FOR TESTING ON MARCH 20, 2001. THE FUEL PUMP WAS INSPECTED, LEAK TESTED, AND FLOW TESTED. NO ANOMALIES WERE NOTED EXCEPT THE CALIBRATION, WHICH RESULTED IN SIMILAR DISCHARGE PRESSURES AS THE PREVIOUS FLOW TEST. ACCORDING TO THE PILOT, THE MECHANIC RECEIVED A THIRD ENGINE DRIVEN FUEL PUMP FROM THE AIRCRAFT MANUFACTURER AND INSTALLED IT ON THE AIRPLANE. THE MECHANIC INFORMED THE PILOT THAT HE HAD TO READJUST THE FUEL INJE CTOR SETTINGS. ACCORDING TO THE PILOT, THERE HAVE BEEN NO ANOMALIES WITH THE ENGINE SINCE THE THIRD FUEL PUMP REPLACEMENT AND FUEL INJECTOR ADJUSTMENT.