Removal of the Unwinding Provisions in the Automated Clearing Settlement System: A Risk Assessment Staff Discussion Paper 2014-4 Nicholas Labelle, Varya Taylor A default in the Automated Clearing Settlement System (ACSS) occurs when a Direct Clearer is unable to settle its final obligation. Content Type(s): Staff research, Staff discussion papers Topic(s): Financial stability, Payment clearing and settlement systems JEL Code(s): C, C1, C15, G, G0, G01, G2, G3