DEPARTMENT OF THE NAVY
OFFICE OF THE CHIEF OF NAVAL OPERATIONS
2000 NAVY PENTAGON
WASHINGTON DC 20350-2000
OPNAVINST 4442.5B
N4
17 Nov 2022
OPNAV INSTRUCTION 4442.5B
From: Chief of Naval Operations
Subj: READINESS BASED SPARING
Ref: (a) DoD Manual 4140.01, Volume 2, DoD Supply Chain Materiel Management
Procedures: Demand And Supply Planning, 9 November 2018
(b) 10 U.S.C §4324
(c) DoD Instruction 5000.02 of 23 of January 2020
(d) SECNAVINST 5000.2G
(e) OPNAVINST 3000.12B
(f) OPNAVINST 4441.12E
(g) COMNAVAIRFORINST 4790.2D
(h) OPNAVINST 4000.57H
(i) NAVSEAINST 4441.12A/NAVSUPINST 4441.37A
(j) COMNAVAIRFORINST 3510.11C
1. 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).
2. Cancellation. OPNAVINST 4442.5A.
3. 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 (A
o
) 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.
