53 Pa.C.S. § 2971

Upon the adoption by the electors of any of the optional plans of government as set forth in this subpart, the municipality shall thereafter be governed by the plan adopted and by the provisions of general law applicable to that class or classes of municipality except as otherwise provided in this subpart. Until the municipality adopts another form of government, the plan adopted and the provisions of general law applicable to that class or classes of municipality shall be law. All statutes affecting the organization, government and powers of the municipality which are not inconsistent or in conflict with this subpart shall remain in full force until modified or repealed.