DURING THE LNDG ROLL OUT AN A300'S OUTER THRUST REVERSER HALF CAME OFF THE ENG WITH NO CREW ALERTS. A SLIGHT YAW WAS FELT AT APPROXIMATELY 110-120 KTS.

Narrative

AFTER A STABILIZED ILS APCH IN VMC CONDITIONS AND A BETTER THAN AVERAGE TOUCHDOWN APPROX 1600 TO 1800 FT DOWN THE RWY; WITH NORMAL SPOILER DEPLOYMENT AND THRUST REVERSER SELECTION; WE EXPERIENCED A VERY SLIGHT TUG TO THE LEFT AT APPROX 120 TO 100 KTS WHICH FELT LIKE A BRAKE HAD GRABBED SLIGHTLY BUT CTRLINE CTL WAS NEVER A PROBLEM. I CHKED THE AUTOBRAKE SELECTOR TO VERIFY THAT NO AUTOBRAKING WAS SELECTED AND CHKED ECAM AND SAW THAT NONE OF THE WHEEL BRAKE ANTISKID WERE RELEASED. THE REMAINDER OF THE ROLLOUT WAS NORMAL AND WE CLEARED THE RWY AND HELD SHORT OF RWY 22R. THE NEXT ACFT TO LAND ON RWY 22L REPORTED A PIECE OF ENG COWLING AND OTHER SMALLER DEBRIS ON THE RWY NEAR THE 4000 FT REMAINING MARKER. TWR INQUIRED AS TO WHETHER WE HAD SEEN THE DEBRIS AND WE REPORTED THAT WE HAD NOT. TWR LATER ASKED IF WE HAD EXPERIENCED ANY MALFUNCTIONS DURING LNDG TO WHICH WE ALSO REPLIED THAT WE HAD NOT. WE CHKED WITH THE CABIN CREW TO SEE IF THEY HAD HEARD ANYTHING OR HAD ANY REPORTS FROM PAX BUT ALL WAS REPORTED TO HAVE BEEN NORMAL. AFTER ARR AT GATE WE LEARNED THE OUTER HALF OF THE #2 ENG THRUST REVERSER HAD DEPARTED THE ACFT AND THE DEBRIS WAS INDEED OURS. WHILE TAXIING IN WE HAD EXPERIENCED NO ABNORMALITIES; RECEIVED NO ECAM ADVISORIES AND DID NOT HAVE ANY TR LIGHTS TO CAUSE US CONCERN. AS A RESULT OF THE TWR'S QUICK CLOSURE OF THE RWY; ONLY ONE ACFT; THE ONE THAT REPORTED THE DEBRIS HAD ANY RISK OF HAZARD FROM FOD.CALLBACK CONVERSATION WITH RPTR 798109 REVEALED THE FOLLOWING INFO: THE REPORTER STATED THAT THERE WERE NO INDICATIONS IN THE FLT STATION ALERTING THE CREW ABOUT THE REVERSER FAILURE. THE SLIGHT TUGGING THE CREW REPORTED IS A COMMON EXPERIENCE ON LANDING WHEN THE BRAKES ARE FIRST APPLIED AND ONE OR MORE BRAKES GRAB. WHEN THE ENG WAS VISUALLY INSPECTED; IT COULD BE SEEN THAT THE THRUST REVERSER DEPARTED VIOLENTLY BECAUSE ALL OF THE ATTACH POINTS AND ACTUATORS WERE DAMAGED.