If the GFRC was written for aircraft to be purchased by the DoD and generally not used for COCO aircraft, how does one get relief from 228.370 which states "Use the clause at 252.228-7001, Ground and Flight Risk, in all solicitations and contracts for the acquisition, development, production, modification, maintenance, repair, flight, or overhaul of aircraft..." This seems pretty expansive and I don't see an exception for COCO, other than discussion in CMA 100. In the absence of the GFRC, should DCMA Instr 8210.10 or other DFARs be applied to COCO aircraft contracts? What should contracting officers understand about airworthiness and aircraft design changes performed under a DoD contract?