What was found
(CAN) SHORTLY AFTER TAKEOFF, ENGINE BACKFIRED, HESITATED AND CLEARED ITSELF 4 TIMES IN SUCCESSION.PILOT PERFORMED EMERGENCY LANDING AT BRAMPTON AIROPORT, WAS UNABLE TO LOWER GEAR IN TIME, AND LANDED ON FLOAT KEELS. DAMAGE TO FLOATS KEELS SUSTAINED. CAUSE OF BACKFIRING UNDER INESTIGATION, FOLLOW-UP REPORT WILL BE ISSUED.