Archivelog deletion using RMAN

rman target /

list archivelog all backed up 1 times to DEVICE TYPE DISK completed before 'sysdate-3';

delete noprompt archivelog all backed up 1 times to DEVICE TYPE DISK completed before 'sysdate-3';

If you know that the logs are unavailable because you deleted them by using an operating system utility, then run the following command at the RMAN prompt to update RMAN metadata:
CROSSCHECK ARCHIVELOG ALL;

It is always better to use RMAN to delete logs than to use an operating system utility. The easiest method to remove unwanted logs is to specify the DELETE INPUT option when backing up archived logs.

For example, enter:
BACKUP DEVICE TYPE sbt ARCHIVELOG ALL DELETE ALL INPUT;