Narrative:

Upon arrival at the gate at ZZZ from ZZZ1 all nighter, the right engine was observed to not shut down upon the placement of the start lever in the cutoff position. Although the engine did indicate some, but not entire, egt decrease and spool down, concern was felt over the 500 pph fuel indication. The captain and I felt that possibly the fuel controller was malfunctioning with the possible result of fuel being pumped out unburned into the engine. After concurrence with the captain, I pulled the right engine fire handle to fully shut down the engine and cut off the fuel. Upon pulling the fire handle, we noticed that the fire extinguisher bottle discharged into the engine. It is possible that when I pulled the fire handle, I applied some twist to the handle accidentally, resulting in the fire bottle firing. I am not certain of this however, as I felt that I pulled the handle straight out. When the fire handle was pulled, the engine was observed to completely shut down with fuel flows going on down to zero pph. After passenger unloading, I went downstairs to find the mechanic doing the walk around and advised him of the situation. Additionally, during this time downstairs I could smell the odor of unburned fuel around the right engine, indicating to me that the engine indeed did not fully shut down initially resulting in fuel pumping unburned into it.

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Original NASA ASRS Text

Title: A B767 CREW WAS UNABLE TO SHUTDOWN THE R ENGINE WITH THE FUEL CTL CUTOFF SWITCH REQUIRING PULLING THE FIRE HANDLE INADVERTENTLY DISCHARGING THE FIRE BOTTLE.

Narrative: UPON ARRIVAL AT THE GATE AT ZZZ FROM ZZZ1 ALL NIGHTER, THE R ENGINE WAS OBSERVED TO NOT SHUT DOWN UPON THE PLACEMENT OF THE START LEVER IN THE CUTOFF POSITION. ALTHOUGH THE ENGINE DID INDICATE SOME, BUT NOT ENTIRE, EGT DECREASE AND SPOOL DOWN, CONCERN WAS FELT OVER THE 500 PPH FUEL INDICATION. THE CAPT AND I FELT THAT POSSIBLY THE FUEL CTLR WAS MALFUNCTIONING WITH THE POSSIBLE RESULT OF FUEL BEING PUMPED OUT UNBURNED INTO THE ENGINE. AFTER CONCURRENCE WITH THE CAPT, I PULLED THE R ENGINE FIRE HANDLE TO FULLY SHUT DOWN THE ENGINE AND CUT OFF THE FUEL. UPON PULLING THE FIRE HANDLE, WE NOTICED THAT THE FIRE EXTINGUISHER BOTTLE DISCHARGED INTO THE ENGINE. IT IS POSSIBLE THAT WHEN I PULLED THE FIRE HANDLE, I APPLIED SOME TWIST TO THE HANDLE ACCIDENTALLY, RESULTING IN THE FIRE BOTTLE FIRING. I AM NOT CERTAIN OF THIS HOWEVER, AS I FELT THAT I PULLED THE HANDLE STRAIGHT OUT. WHEN THE FIRE HANDLE WAS PULLED, THE ENGINE WAS OBSERVED TO COMPLETELY SHUT DOWN WITH FUEL FLOWS GOING ON DOWN TO ZERO PPH. AFTER PAX UNLOADING, I WENT DOWNSTAIRS TO FIND THE MECHANIC DOING THE WALK AROUND AND ADVISED HIM OF THE SIT. ADDITIONALLY, DURING THIS TIME DOWNSTAIRS I COULD SMELL THE ODOR OF UNBURNED FUEL AROUND THE R ENGINE, INDICATING TO ME THAT THE ENGINE INDEED DID NOT FULLY SHUT DOWN INITIALLY RESULTING IN FUEL PUMPING UNBURNED INTO IT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.