B767 CREW HAD FUEL CTL LEVER LOCK SWITCH BUMPED TO THE CUTOFF POS.

Narrative

LEVEL AT FL280 340 KIAS -- CLR; SMOOTH. EXPLAINING A POINT TO THE FO DURING A LINE CHK; I TOUCHED THE R FUEL SHUTOFF SWITCH WITH THE SIDE OF MY HAND. THE SWITCH BEGAN TO MOVE TO THE SHUTOFF POS. THE R ENG BEGAN TO ROLL BACK IN RPM. IMMEDIATE RETURN OF SWITCH TO RUN RECOVERED ENG INSTANTLY. NO IGNITION WAS ON; SO I BELIEVE WE CAUGHT IT BEFORE FLAMEOUT. THIS SWITCH IS A LEVER LOCK SWITCH AND SHOULD NEVER HAVE MOVED WITH A LIGHT TOUCH. WE CONTACTED OUR DISPATCH AND MAINT AND DECIDED TO CONTINUE WITH A LOGBOOK WRITE-UP AND INSPECTION SCHEDULED AT DEST. REST OF TRIP WAS ROUTINE. I BELIEVED THAT THE CAUSE OF THIS WAS THE FUEL CTL SWITCH DID NOT SEAT IN THE LEVER LOCK DETENT WHEN PLACED TO 'ON' DURING START. IT WAS HELD IN THE RUN POS BY FRICTION BTWN THE RAMP LEADING UP TO THE DETENT AND THE LOCKING PIN WHICH IS SPRING-LOADED. I DON'T KNOW WHY THIS HAPPENED SINCE THIS WAS THE SAME WAY I HAVE STARTED THESE ENGS FOR 12 YRS. CORRECTIVE ACTION: I THINK THIS IS THE SECOND EVENT OF THIS TYPE OUR AIRLINE HAS EXPERIENCED. IN THE LAST YR; A SUNSHADE FELL DOWN KNOCKING ONE OF THESE SWITCHES OFF; SHUTTING DOWN THE ENG. THIS NEVER MADE SENSE UNTIL YOU VIEW IT IN RELATION TO THIS EVENT. SINCE REDESIGN OF THE SWITCH IS PROBABLY OUT OF THE QUESTION; I WOULD EMPHASIZE TO ALL TO BE VERY POSITIVE IN CHKING THESE SWITCHES ARE LOCKED IN THE 'ON' POS AFTER START.