Banks can indeed file a summary suit under Order 37 of the CPC for the recovery of Non-Performing Asset (NPA) dues, provided the claim is based on a written contract, such as loan agreements or promissory notes. This method offers a faster recovery process compared to a standard civil suit, as defendants require court permission to present a defence. However, summary suits are not suitable for complex cases involving disputed accounts or allegations of fraud, where a traditional civil suit would be more appropriate.