What was found
(CAN) ON DESCENT INTO YYC, WITH POWER LEVERS AT IDLE, THE ACFT SHUDDERED MOMENTARILY. THE NR 2 THRUST REVERSER UNLOCK LIGHT ILLUMINATED AND IN-FLIGHT SHUT DOWN OF NR 2 ENGINE WAS CARRIED OUT. THE ACFT LANDED WITHOUT INCIDENT AND AN INSPECTION WAS CARRIED OUT ON NR 2 ENGINE. NR 2 ENGINE RT TRANSLATING COWL WAS FOUND DELAMINATED WITH A SECTION OF THE COWL MISSING. THE COWL WAS REPLACED, FUNCTION CHECKED AND THE ACFT RETURNED TO SERVICE.