What was found
(CAN) WHILE PASSING 3000 FT, LT ENG OIL PRESS DECREASED RAPIDLY & SMOKE WAS OBSERVED IN THE COCKPIT. THE CREW USED OXYGEN MASKS & LANDED UNEVENTFULLY. NO INJURIES REPORTED. TROUBLESHOOTING IS ONGOING. MFG WILL INVESTIGATE TO ESTABLISH ROOT CAUSE & PROVIDE INFORMATION TO TRANSPORT CANADA THROUGH SUBSEQUENT SERVICE DIFFICULTY REVIEW MEETING & SUPPORTING DOCUMENTS OR OTHER AGREED UPON COMMUNICATIONS.