Acceleration of the amount of a debt due to a default under the loan documents can be reversed under certain circumstances (including the curing of the default) without the creditor’s claim being considered impaired. A creditor that is not impaired does not have the right to vote on a plan. If a plan impairs no class of creditors, it need not satisfy the One-Impaired-Class-Must-Accept-The-Plan Rule.
Bankruptcy Code § 1124. See also Non-Impairment Plan, One-Impaired-Class-Must-Accept-The-Plan Rule.