Class. Planned Amortization Class tranche. PAC-2 refers to a support tranche that is given a scheduled payment structure like a PAC bond.
Principal payment must follow a certain schedule. These tranches have priority over the other tranches in the deal, which are then referred to as the support or companion tranches. For example, let's say you have a deal with a PAC tranche and a support tranche (i.e., a tranche that is a support tranche and is therefore subordinate to the PAC tranche) that has a scheduled payment structure like you did with the PAC bond. That support bond then is called the PAC-2 bond. If you continue, and create another support tranche that also has scheduled payments, that would become the PAC-3 bond.
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