Yes, according to regulation 22 PA Code § 141.21(2)(iv)(A)(II) The library shall have a qualified staff member, full time or equivalent, for each 3,500 persons in the direct service area; provided that no library shall use fewer than one full time staff member. In the case of a library which fulfills this standard by use of only one full time staff member, that person must be certified as at least a library assistant in accordance with § 133.6 (relating to library assistant).
BLD interprets the highlighted portion of the above regulation as requiring each library to have at least one full time staff member regardless of the FTE calculation.