BE400A CREW HAD BOTH ENGS SHUT DOWN ON LNDG; AFTER THE START LEVERS GOT INTO THE SHUTDOWN MODE.

Narrative

UPON LNDG ZZZ WHILE TRYING TO DEPLOY THRUST REVERSERS BOTH THRUST LEVERS WENT INTO IDLE CUTOFF SHUTTING DOWN BOTH ENGS. AT FIRST I THOUGHT THIS MIGHT BE DUE TO MECHANICAL MALFUNCTION AS THIS IS ABNORMAL; NOT SUPPOSED TO BE ABLE TO HAPPEN; AND THE THROTTLE QUADRANT HAD BEEN WORKED ON MULTIPLE TIMES LATELY BY MAINT. AFTER INVESTIGATION BY NTSB AND COMPANY MECHS; NO MECHANICAL IRREGULARITIES WERE NOTED. HOWEVER I UNDERSTAND AN OFFICIAL OF MAINT FOR RAYTHEON ACFT SVCS SAT IN THE PLANE; WENT TO EXTEND REVERSERS; AND BOTH THRUST LEVERS WENT INTO CUTOFF. AFTER FURTHER EXAMINATION; IT WAS NOTED THAT THE DESIGN OF THE THRUST LEVERS PUTS PART OF THE LOCKOUT MECHANISM TO PREVENT GOING INTO CUTOFF; WITHIN EASY REACH WHERE THEY CAN BE EASILY BUMPED WHILE TRYING TO RAISE THE THRUST REVERSAL PADDLES; AND MAKING IT POSSIBLE TO ACCIDENTALLY SHUT OFF THE ENGS; ESPECIALLY IN A CASE WHERE THE THRUST REVERSERS ARE NOT DEPLOYING CORRECTLY AND A PLT MAY TRY REPEATEDLY TO EXTEND THEM. I NEVER KNEW THIS WAS POSSIBLE BEFORE THIS INCIDENT; BUT IT IS; AND HAS HAPPENED BEFORE. IN MY CASE WE USED NORMAL BRAKING TO DECELERATE AND EXITED THE RWY; AND RESTARTED AN ENG. IT COULD UNDER SOME CIRCUMSTANCES BE MUCH WORSE. PERHAPS A GUARD COULD BE FASHIONED UNDER THE REVERSAL PADDLES OR A REDESIGN OF THE LEVERS? CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CAPT NOTES THERE WAS A CHRONIC PROB WITH THE THROTTLE QUADRANT. THE START LEVERS ARE ELECTRICAL AND ARE TIED INTO THE THRUST LEVERS. THERE IS A RELEASE INTO THE REVERSERS; THE CREW CAN BUMP THEM WHEN TRYING TO GET INTO REVERSE.