If you wanted to be more succinct you could use:

find . -name "YAAN00.V404.T*.tar" -exec tar xf {} \;

How does it work?

The find command looks in current dir (.) for files matching the -name clause then for each file it executes the tar xf command substituting the file name for {} the \; marks the end of the command to be exec'd (I think).

NB. This command will recurse into sub-directories aswell.

PS. The tar command does not allow you to untar multiple files as it assumes the first argument after f is the tar file and any further arguments are files you would like to extract from the tar file. This allows you to pick individual files from a tar file if you wish.