AN A320 CREW EXPERIENCED A LOOSE CAPT'S SLIDING WINDOW SEAL IMPACTING ON THE ACFT'S FRAME.

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DURING DSCNT INTO TPA; THERE WAS A SUDDEN RATTLING SOUND ON THE CAPT'S SLIDING WINDOW. WE THOUGHT WE HIT SOMETHING AND RPTED WHAT LOOKED LIKE A STRING FLAPPING AROUND ON THE WINDOW. AFTER LNDG AT TPA; I CALLED MAINT AND RPTED THAT IT TURNED OUT TO BE SEALANT FROM THE CAPT'S WINDSHIELD THAT WAS FLAPPING AROUND. THE SEALANT APPEARED TO BE UNCURED. MAINT COULD NOT FIND ANY RECORD OF WINDSHIELD WORK HAVING BEEN DONE ON THAT AIRPLANE. THE SEALANT SURE LOOKED LIKE FRESH STUFF. MY BIG CONCERN IS THAT IF WORK IS BEING DONE; I SHOULD BE ABLE TO FIND OUT ABOUT IT. I DON'T LIKE BEING KEPT IN THE DARK ABOUT THE MAINT HISTORY OF MY MACHINE. HAD I BEEN ABLE TO DETERMINE THAT WINDOW WORK HAD BEEN DONE IT WOULD HAVE MADE MY DECISION PROCESS A LOT MORE SOUND. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CAPT STATED THAT MAINT WAS UNABLE TO PROVIDE INFO BEYOND WHAT WAS IN THE LOGBOOK. THE CREW DID NOT RECEIVE ANY FURTHER FOLLOW UP. THIS CREW MEMBER'S BEST GUESS FROM JUST LOOKING AT THE SEAL IS THAT IT WAS NEW AND HAD NOT BEEN ALLOWED TO CURE SUFFICIENTLY. THIS FLT WAS THE ACFT'S FINAL OF THE DAY SO THAT MAINT WAS ABLE TO WORK ON IT OVERNIGHT.