(a) The FAR frequently refers to determinations made by the agency head. Under section 309 of the Federal Property and Administrative Services Act, the Administrator authorized HCA’s to act as agency head to facilitate procurement of property and services under Title III of the Act. (See GSA Delegation of Authority Manual, ADM P 5450.39C.)
(b) An HCA normally signs a class D&F.
(c) If a statute precludes an agency head redelegating authority, the Administrator must sign the D&F (See, for example, FAR 6.302-7).