Find out more about Readiness Based Sparing!
- RBS Homepage
- More Details
- Naval Logistics Readiness Research Center
In order to sustain specified readiness goals for key equipments/weapons systems or subsystems with minimum investment in spares inventories, RBS implements a structured, progressive process. The RBS process can be applied to new or existing equipment or weapon systems and to commercial off-the-shelf (COTS) as well as government developed equipment. The earlier the process is applied, the greater the benefits in terms of engineering, logistics support and total lifecycle cost.
The MERBS Workstation has a series of data validation tools such as the Provisioning Technical Documentation (PTD) quality assurance, Mission Essentiality Code (MEC) validation and the Mean Time Between Failure/Mean Time To Repair (MTBF/MTTR) review tools. In addition, the RBS Workstation has tools for or can be linked to tools for
- Configuration Management (CM)
- Reliability, Maintainability and Supportability (RMS) assessment
- Demand projection
- Wholesale and retail parts computation
The Computer Aided Readiness Assessment Tool (CARAT), a MERBS Workstation tool, is used to prepare Reliability Block Diagrams, RMS data and Design Reference Mission data for use in the workstation simulator.
MERBS works like the single echelon RBS system, except that each stock numbered item receives its own best estimate of Logistics Response Time (Customer Wait Time plus OST) values, which are carried throughout the process. This includes impacts on availability, mean supply response time and equipment type delay times. Spares optimization takes place at the equipment type level. Individual parts are selected for each equipment type in Ao gained per dollar of unit cost. An optimum iterative procedure then finds the point that yields the weapons system Ao goal.
The above process is repeated for wholesale stock levels determined by seeking diverse Customer Wait Time goals. The resulting total (wholesale plus retail) costs are fit using a least squares technique. The minimum of the least squares fit equation is rerun through the complete process to determine the overall least total cost inventory. The MERBS process has been centralized in the RBS Workstation that provides automated tools to accomplish these procedures and analyze the results.
A collateral use of MERBS has been applied to the analysis of CLS/PBL by using the CARES system within the RBS Workstation to evaluate procurement and repair lead time variations expected in contractor managed operations. In this approach, demands from the RBS Workstation are fed to CLS/PBL performance parameters as if it were a war gaming scenario to determine average days delay and repair quantities in CLS/PBL situations. This allows the determination of the expected value of the wholesale investment and the required performance parameters to support the retail allowances and readiness objectives. This information can be used to establish baselines against which CLS/PBL proposals can be evaluated and to establish contract incentive clauses.
CRCS/CADS is the key integration system for RBS in the aviation arena.
Short-Term RBS Application
CRCS/CADS replaces a set of NAVICP-P local unique ADP processes and manual procedures developed in the 1960s. Through the CRCS/CADS approach all rates and ITAT computations are standardized and the rates development and Q/A process proceed separately from allowance development. Thus, adequate time is now available to checkout or review rates and this effort is no longer on the critical path to producing allowances. Statistical Process Control methods and business rules have been implemented to systematically reduce unnecessary allowance churn and stabilize the rates forecasts.
CADS provides a state-of-the-art allowance project development and tracking system to organize, execute and manage each step required to build, Q/A and publish the allowance product. Top Down Break Down (TDBD) configuration data by Type/Model/Series (T/M/S) is extracted from the Navy Weapons Systems File (WSF) and stored on the server along with flying hour, Navy Aviation Intermediate Maintenance Depot (AIMD) repair and aviation usage data from the 3M system. This information is coupled with Aviation Equipment Configuration List (AECL) and Allowance Requirements Register (ARR) information to provide the widest possible base for selecting allowance candidates.
Special care was taken in the design of the system to keep the system database architecture as open as possible. Thus, though the WSF may no longer exist in ERP, it seems reasonable that aircraft configuration data and TDBD would not go away since it will remain a key element to any aviation sparring process.
The Configuration Data Management System (CDMS) area of CRCS/CADS is capable of supporting a wide range of TDBD and Bill of Materials (BOM) type configuration data structures. Thus, though the CRCS/CADS Extract Transfer and Load (ETL) programs would need revision to reflect new database sources, all the programs within CRCS/CADS are largely sheltered from such outside disturbances.
The same rational applies to changes in flying hour data and aviation repair and usage data. We rely today on the Record-79 SICR-3 reporting system to
capture aircraft flying hours and the 3M 4790-2K Vids MAF transactions to capture repair and usage information. Though ERP at NAVAIR may change the
physical database source from NALDA-II to some new system or database, there likely will always be a need to record flying hours by T/M/S and to record
and store aviation maintenance and parts usage data. Thus, no major problems are foreseen in mapping the ETL programs to work with the future ERP data sources.
Long-Term RBS Application
There will always be a need to develop and maintain usage rates and to publish lists of allowed items selected to achieve some readiness goal or objective. These are fundamental mission elements of the ICP Core Business. These functions have become both very specialized and very militarized - reflecting many years of technological and business process development. An enormous effort and considerable time would be required to build these capabilities into ERP with little added value above what is available today.
The ability to relate inventory investment to readiness is a key element missing from all ERP systems primarily because business are managed to a profit versus readiness objective. Since the RBS Workstation is an integral part of CRCS/CADS, it can develop aviation allowances that meet readiness goals by T/M/S and ACWT goals for less critical inventories.
Likewise, it can import external data and evaluate the cost and readiness impact of wholesale inventories and delivery times developed by other inventory system like SAP-R3 or Manugistics. Equally important is the ability of CRCS/CADS to support the aviation retail operations of the ICP. It has been specifically designed through a host of special features to maximize Code 08 personnel effectiveness and resource utilization and thus make the timely production of accurate allowances a reality. It is therefore recommended that the CRCS/CADS system be designated as a bolt-on application to ERP.