L2-MNT-SPARE CRITICAL ROBOTICS Level 2 · hardware

Spare Parts Inventory

Spare Parts Inventory and Supply Chain Management

The spare parts inventory and supply chain management subsystem tracks stock levels, monitors consumption rates, and triggers fabrication orders to maintain critical component availability. Operating with zero Earth resupply following initial deployment, the system must manage a finite cache of spares across a 100-year operational lifetime. Stored parts must withstand decades of exposure to the lunar environment before installation without functional degradation. Because in-situ manufacturing cannot produce all hardware types—with critical electronic components being the most difficult to fabricate locally—the subsystem integrates wear-rate consumption forecasting, criticality-based stocking priorities, and cannibalization analysis of non-critical assemblies to maintain hardware availability.

Parts catalog, stock level tracking, consumption monitoring, and reorder triggers to L1-MFG

Purpose

Manage spare parts inventory ensuring critical components are always available

Context

Component of L1-MNT within the Lunar Ark system

Principles

▸Criticality-based stocking ensures highest-priority spares always available
▸Consumption forecasting predicts spare part needs based on wear rates and failure data
▸ISRU manufacturing capability reduces dependence on pre-positioned Earth-supplied spares
▸Cannibalization analysis identifies non-critical parts that can be repurposed

Typical implementations

▸ISS Orbital Replacement Unit (ORU) spare parts management
▸Military supply chain management for remote installations
▸Submarine spare parts stocking optimization for extended patrols
▸3D printing on-demand spare parts manufacturing (adopted by US Navy)

Lunar considerations

▸Zero resupply after initial deployment means finite spare parts inventory
▸ISRU manufacturing can produce some but not all spare parts types
▸Critical electronic components hardest to manufacture in-situ
▸Spare parts must survive decades of storage in lunar environment before use

Specifications

Functional

primary function

Manage spare parts inventory ensuring critical components are always available

Operational

thermal range c	-173, 127
lifetime years	100

Interfaces

Provides

→Maintenance Scheduling Systemdataessential
Current spare parts availability for maintenance planning
→Preventive Maintenance Systemmaterialcritical
Physical spare parts for maintenance operations