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) or mission capable rates or both. Per reference (a), the term RBS applies to single echelon and single indenture systems, as well as their multi-echelon and multi-indenture extensions, where applicable. RBS applies to all methods of product support whether by organic or commercially provided practices.

b. All aviation and maritime programs must utilize RBS to the maximum extent. All maritime programs and systems must use the Navy Common Readiness Model (NCRM) to execute RBS. NCRM is a suite of capabilities used to perform a variety of Product Support Analysis (e.g., maintenance, manning, training, reliability and sparing (RBS in this case)). NCRM models should be updated continuously throughout the program's lifecycle to reflect the most accurate configuration(s), sustainment strategy execution and applicable data based on analytical order of precedence (predicted, analogous, test and operational). Validation of NCRM models must be conducted by comparing predicted results to actuals observed during execution and the correlation between those results used to influence model updates and continuous validation. This includes new acquisition programs, critical Hull Mechanical & Electrical systems and maritime support equipment. Exceptions include Commander, Naval Sea Systems Command, Trident and Nuclear Propulsion (SEA 08). All other exceptions should be requested through Maritime Allowance, Readiness Based Sparing, Re-provisioning and Change Review Board (MARRC-RB) for OPNAV adjudication. The current approved RBS models are Naval Aviation Readiness Model for aviation and NCRM for maritime. Program offices should utilize RBS models early in the acquisition design and engineering phase to establish spares requirements and system performance.

Purpose.

To establish, verify and validate sparing requirements, determination policies and procedures to 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).