scope:

Scope and Applicability

a. This instruction describes the application of readiness based sparing (RBS ) methodology to spares and repair parts allowance determination to ensure that prescribed readiness thresholds and objectives are achieved at the lowest possible cost. Readiness thresholds are expressed as either operational availability (Ao) or full mission capable (FMC ) and or mission capable (Me ) rates. The term "RBS" applies to single echelon and single indenture systems, as well as their multi-echelon (ME) and multi-indenture (MI ) extensions. RBS applies to organic (Department of Navy (DON) and or Department of Defense ) practices, as well as performance based logistics (PBL) practices.

b. RBS is to be utilized for all new acquisition programs and equipment modification programs in acquisition categories (ACATs ) I, II, or III, with the exception of nuclear and fleet ballistic missile submarine (SSBN) programs . It should be applied, as appropriate, to existing weapon systems and other new systems (i.e., ACAT IV) when it provides an optimal method for attaining the required readiness objective and or cost constraint. RBS is to be applied to both aviation and maritime allowance package development, aviation consolidated allowance lists (AVCALs ) , shore-based consolidated allowance lists (SHORCALs ) , all Marine aviation logistics support packages (MALSPs ) , and coordinated shipboard allowance lists (COSALs ).

c. New acquisition programs (ACATs I, II, or III ) in the system development and demonst r ation phase or at the end of the technological development phase will apply the RBS process . This includes programs that require tailored interim supply support assistance to achieve full logistic support capability. The RBS assessment and sparing processes must be completed in time to allow for sufficient administrative and production leadtime before the material support date (MSD ) . RES is an ongoing process and should be reviewed at least annually over the life of the weapon system or other acquisition program .

d. RBS will generally apply to commercial best practices like PBL or time definite delivery (i.e., use of premium transportation) . RBS will also be applied, as appropriate , in the procurement and support of commercial and non-developmental item (CaNDI ) spares, subsystems, or systems, and in support of alternative approaches such as pre-positioned spares.

 e. RBS is critical in the life cycle of any system requiring supply support and plays an important role in the provisioning for initial support, as well as an equally important and ongoing role in subsequent replenishment support. Readiness and performance metrics, such as Ao and customer wait time (CWT) , help indicate how well the system's integrated logistics support elLS ) i s fulfilling its purpose during the production and deployment phase of a system's life cycle. A robust RBS effort over the system's life cycle is vital to supply support effectiveness and its effect on Ao and CWT.

Purpose. policies and To establish sparing requirements, determination procedures, ensure life cycle supply support for weapon systems and other acquisition programs, and to achieve cost and operational readiness objectives specified by the Office of the Chief of Naval Operations (OPNAV) .