What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) During cruise the pilot noted fuel pressure dropped to zero and turned on the electric pump. However this caused more smoke to be observed coming out of the engine and he turned off boost pump. Oil pressure started dropping off and no power was being developed. At approximately 500 feet above the ground, the engine seized. Off-field landing was madw without incident. Subsequent inspection revealed a plain nut had backed off in the scavenge pump housing assembly and jammed the oil pump gears. Pratt & whitney sb no. 13321 warns of this possibility and recommends modification by the installation of self-locking nuts. The service bulletin was classified as "category 8" and is optional compliance. Maintenance personnel stated that most locking washers with the bent tab around the plain nuts were not done with good quality and could have been installed better by manufacture's personnel.
As the FAA filed it
(-23) DURING CRUISE THE PILOT NOTED FUEL PRESSURE DROPPED TO ZERO AND TURNED ON THE ELECTRIC PUMP. HOWEVER THIS CAUSED MORE SMOKE TO BE OBSERVED COMING OUT OF THE ENGINE AND HE TURNED OFF BOOST PUMP. OIL PRESSURE STARTED DROPPING OFF AND NO POWER WAS BEING DEVELOPED. AT APPROXIMATELY 500 FEET ABOVE THE GROUND, THE ENGINE SEIZED. OFF-FIELD LANDING WAS MADW WITHOUT INCIDENT. SUBSEQUENT INSPECTION REVEALED A PLAIN NUT HAD BACKED OFF IN THE SCAVENGE PUMP HOUSING ASSEMBLY AND JAMMED THE OIL PUMP GEARS. PRATT & WHITNEY SB NO. 13321 WARNS OF THIS POSSIBILITY AND RECOMMENDS MODIFICATION BY THE INSTALLATION OF SELF-LOCKING NUTS. THE SERVICE BULLETIN WAS CLASSIFIED AS "CATEGORY 8" AND IS OPTIONAL COMPLIANCE. MAINTENANCE PERSONNEL STATED THAT MOST LOCKING WASHERS WITH THE BENT TAB AROUND THE PLAIN NUTS WERE NOT DONE WITH GOOD QUALITY AND COULD HAVE BEEN INSTALLED BETTER BY MANUFACTURE'S PERSONNEL.
Other reports on N5111A · 1
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