What was found
A/C SUFFERED A PWR LOSS IN FLT DUE TO THE COLLAPSE/FRACTURE OF NR 2 CYLINDER EXHAUST VALVE HYD LIFTER BODY P/N 72877. THE PILOT WAS ABLE TO MAINTAIN CONTROL OF THE A/C AND CONTINUE THE FLT TO THE CLOSEST AIRPORT (SWAN HILLS, ALBERTA 'CEM5'). LANDED W/O FURTHER INCIDENT. INSPECTION REVEALED INTERNAL DAMAGE TO THE ENGINE RESULTING FROM THE BREAK-UP OF THE VALVE LIFTER BODY, AND PIECES OF IT BEING PROJECTED AGAINST THE CRANKCASE, AS A RESULT. THE ENG IS A TOTAL WRITE OFF THE ENGINE WAS CHANGED AND THE A/C WAS RETURNED TO SERVICE. THIS ENGINE OPERATED ON A TRANSPORT CANADA APPROVED 'ON CONDITION' MX PROGRAM. FLIGHT TECH AVIATION AS THE MX ARM OF ALTA FLIGHTS (CHARTERS) INC HAVE DECIDED TO REDUCE THIS ENG MAKE/M