A BEECH 1900D IN CRUISE AT FL250 HAD THE FIREWALL SHUTOFF HANDLE PULLED ON #2 ENG TO SIMULATE A FAILED ENG. CREW WAS UNABLE TO RELIGHT THE ENG ON 4 ATTEMPTS. ENG SEIZED.

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ON FLT XYZ OUT OF DEN TO ZZZ; WE WERE JUST LEVELING OUT AT FL250 WHEN MY CAPT DECIDED TO PULL THE FIREWALL FUEL VALVE (T-HANDLE) ON THE #2 ENG (R) TO SIMULATE AN ENG FAILURE. I HAD NO IDEA HE WAS GOING TO DO THIS; SO I CALLED FOR THE CHKLIST OF ENG FIRE OR FAILURE DURING FLT. I ALSO CALLED 'SET MAX PWR; PROPS FULL FORWARD; AND VERIFY GEAR AND FLAPS ARE UP AND VERIFY #2 HAS FAILED AND FEATHERED.' AT THIS TIME MY CAPT PUSHED THE FIREWALL FUEL VALVE BACK IN. THE ENG FAILED TO RELIGHT. WE TRIED SEVERAL DIFFERENT TIMES TO RESTART THE ENG USING BOTH THE STARTER ASSIST CHKLIST AND THE AIRSTART CHKLIST. I SUGGESTED THAT WE CALL CTR AND TELL THEM OF OUR SIT BUT THE CAPT SAID 'NO.' I ALSO ASKED THAT WE CALL COMPANY OPS; WHICH HE ALSO DECLINED. ON THE 4TH AND FINAL ATTEMPT TO RESTART THE ENG; THE PROP STOPPED SPINNING WHICH INDICATED THAT THE ENG SEIZED UP. WE CONTINUED ON TO OUR DEST OF ZZZ; US; WITHOUT NOTIFYING ANYONE OF OUR SIT. WE LANDED WITHOUT INCIDENT AND HAD THE ACFT TOWED TO THE RAMP. THE R ENG WAS COMPLETELY DESTROYED INTERNALLY IS WHAT WE WERE TOLD. THERE WERE NO PAX ON THIS FLT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAPT; WITH NO WARNING; PULLED THE FIREWALL SHUTOFF HANDLE FOR #2 ENG; SHUTTING THE ENG DOWN TO SIMULATE A FAILED ENG. THE RPTR SAID 4 RELIGHT ATTEMPTS WERE MADE AND THEN THE ENG SEIZED. THE RPTR SAID THE ENG INCURRED $500;000 WORTH OF INTERNAL DAMAGE. THE RPTR SAID THE CAPT WAS TERMINATED AND THE RPTR WAS ALLOWED TO RESIGN OR BE TERMINATED; WHICH THE RPTR FEELS IS A GREAT INJUSTICE. THE RPTR STATED THE ACR BELIEVES THE RPTR COULD HAVE PREVENTED THE FIREWALL HANDLE FROM BEING PULLED BUT THE SUDDEN PULLING OF THE HANDLE COULD NOT HAVE BEEN PREVENTED.