66.228 5r 109 -

Wait, maybe it's part of the Federal Code or Federal Acquisition Regulations? The FAR has parts and sections. Let me see. For example, FAR 5.101 is a part and section. If the user is referring to 5r 109, maybe it's in the FAR under part 5, section R.109? But 5r 109 doesn't sound familiar. Maybe it's a typo or a misformatting. Alternatively, in the Code of Federal Regulations (CFR), the structure is Title - Part - Section. For example, 49 CFR 5.101 would be Title 49, part 5, section 101.