Benjamin Admin
de140e564e
P1 of the auto-FMEA build plan: establish the public-domain methodology foundation (no AIAG-VDA/SAE/IEC tables reproduced). - fmea_data_sources.go: MIL-STD-882E severity (Cat I-IV→1-10) + probability (A-F→1-10 with per-hour λ bands), OccurrenceFromRate(λp·α), SeverityForCategory, MIL-STD-1629A CriticalityCm = λp·α·β·t. Own 1-10 projection, government-anchored. - 4 versioned source docs (MIL-STD-1629A, MIL-STD-882E, NASA RCM, FMD-91/NPRD-91) ingested into the new RAG collection bp_iace_fmea_kb (whitelisted). - Tests for all scales/mappings/criticality (green). Next (P1 step 2): fetch FMD-91/NPRD-91 bulk λ/α tables from DTIC. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2.1 KiB
Severity & probability scales — MIL-STD-882E (US public domain)
Open S/O anchor for the IACE auto-FMEA. The 1–10 projection used in code is
BreakPilot's own; these public-domain categories provide the defensible anchor
(no copyrighted AIAG-VDA/SAE 1–10 table is used). Ingested into bp_iace_fmea_kb.
Source
- Source: US DoD — MIL-STD-882E, System Safety (Distribution Statement A, approved for public release)
- License: US Government work — public domain
- Attribution:
Source: MIL-STD-882E (US DoD), public domain - Retrieved: 2026-06 · Ref: DLA QuickSearch (ident 36027)
Table I — Severity (→ our 1–10 S)
| Cat | Severity | Threshold | our S |
|---|---|---|---|
| I | Catastrophic | Death, permanent total disability, irreversible severe environmental damage | 10 |
| II | Critical | Permanent partial disability; hospitalisation of multiple persons | 7 |
| III | Marginal | Injury/illness with lost work day(s) | 4 |
| IV | Negligible | Minor injury, no lost work day | 2 |
Table II — Probability (individual item) (→ our 1–10 O)
| Lvl | Name | Qualitative | rate band (/h, our calibration) | our O |
|---|---|---|---|---|
| A | Frequent | likely to occur often | ≥ 1e-1 | 10 |
| B | Probable | will occur several times | 1e-2 … 1e-1 | 8 |
| C | Occasional | likely to occur sometime | 1e-3 … 1e-2 | 6 |
| D | Remote | unlikely but possible | 1e-6 … 1e-3 | 4 |
| E | Improbable | so unlikely ~ may not occur | < 1e-6 | 2 |
| F | Eliminated | incapable of occurrence | 0 | 1 |
Detection (no government scale)
Detection is an AIAG/SAE concept with no public-domain table. IACE defines its OWN 1–10 detection scale grounded on the generic diagnostic-coverage concept (1 = built-in diagnostic always catches it … 10 = latent, no detection). The IEC-61508/13849 DC tables are copyrighted and are NOT reproduced — only the concept (in our own words) is used.
How used in IACE
MILStd882Severity / MILStd882Probability / OccurrenceFromRate /
SeverityForCategory in fmea_data_sources.go implement these bands. Severity is
preferably resolved through the linked ISO 12100 hazard; occurrence from λp·α.