41 C.F.R. § 102-2.65 When may agencies deviate from the FMR?
Title 41 - Public Contracts and Property Management
Because, it consists primarily of set policies and mandatory requirements, deviation from the FMR should occur infrequently. However, to address unique circumstances or to test the effectiveness of potential policy changes, agencies may be able to deviate from the FMR after following the steps described in §102–2.80.
Title 41: Public Contracts and Property Management
PART 102–2—FEDERAL MANAGEMENT REGULATION SYSTEM
Subpart A—Regulation System
Deviations
§ 102-2.65 When may agencies deviate from the FMR?

