Fault Tree Analysis
Real-Time Fault Tree Traversal Engine
The Real-Time Fault Tree Traversal Engine is a diagnostic software component stored on radiation-hardened NOR flash that evaluates models containing up to 10,000 nodes to identify root causes and downstream failure cascades. Integrated into the Lunar Ark system under L2-SLF-FDI, it executes bidirectional top-down and bottom-up traversals per IEEE 1413 reliability standards while drawing 1 watt of power. Surviving multi-decade lunar surface operations requires maintaining this fault tree over a 100-year design lifetime with a 500,000-hour mean time between failures, relying on machine-learning-augmented updates and archival records to isolate common-cause failures across interconnected settlement systems.
Real-time fault tree traversal engine identifying root causes and downstream consequences of detected faults.
Purpose
Real-time fault tree traversal engine identifying root causes and downstream consequences of detected faults.
Context
Child of L2-SLF-FDI within the Lunar Ark system
Principles
- ▸Fault tree per IEEE 1413 reliability prediction
- ▸Top-down + bottom-up traversal
- ▸Common-cause failure identification
- ▸Cascade analysis
- ▸Per ECSS-Q-ST-30C dependability
Typical implementations
- ▸Industrial fault tree analysis (terrestrial)
- ▸Aerospace RAMS analysis
- ▸Nuclear safety fault trees
Lunar considerations
- ▸Long-mission fault tree maintained over decades
- ▸ML-augmented tree updates
- ▸L1-DVT fault tree archive
Specifications
Functional
| primary function | Real-time fault tree traversal engine identifying root causes and downstream consequences of detected faults. |
| tree size nodes | 10000 |
Physical
| mass kg | 0 |
| materials | Code on rad-hard NOR flash |
| vacuum compatibility | True |
Operational
| power consumption w | 1 |
| thermal range c | -40, 70 |
| lifetime years | 100 |
| mtbf hours | 500000 |
Interfaces
Provides
- Root cause + cascade analysis
- Fault analysis reports
Requires
- Fault probability inputs
Cite this entry
Lunar Ark Codex. "Fault Tree Analysis" (L3-SLF-FDI-TREE). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-SLF-FDI-TREE
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.