ISO 26262 Essentials for Compliance

#!/usr/bin/env python3
# HARA ASIL determination per ISO 26262 Part 3 Table 4

ASIL_TABLE = {
    # (S, E, C): ASIL
    (1,1,1): "QM", (1,1,2): "QM", (1,1,3): "QM",
    (1,2,1): "QM", (1,2,2): "QM", (1,2,3): "QM",
    (1,3,1): "QM", (1,3,2): "QM", (1,3,3): "A",
    (1,4,1): "QM", (1,4,2): "QM", (1,4,3): "A",
    (2,1,1): "QM", (2,1,2): "QM", (2,1,3): "QM",
    (2,2,1): "QM", (2,2,2): "QM", (2,2,3): "A",
    (2,3,1): "QM", (2,3,2): "A",  (2,3,3): "B",
    (2,4,1): "QM", (2,4,2): "A",  (2,4,3): "B",
    (3,1,1): "QM", (3,1,2): "QM", (3,1,3): "A",
    (3,2,1): "QM", (3,2,2): "A",  (3,2,3): "B",
    (3,3,1): "A",  (3,3,2): "B",  (3,3,3): "C",
    (3,4,1): "B",  (3,4,2): "C",  (3,4,3): "D",
}

def determine_asil(severity, exposure, controllability, hazard_name=""):
    key = (severity, exposure, controllability)
    asil = ASIL_TABLE.get(key, "Invalid")
    print(f"  {hazard_name or 'Hazard'}: S{severity}, E{exposure}, C{controllability} → ASIL {asil}")
    return asil

# EPS HARA example
print("HARA Results — Electronic Power Steering:")
determine_asil(3, 3, 2, "Unintended torque > 3Nm at highway speed")  # → ASIL C
determine_asil(3, 3, 1, "Loss of steering assist at low speed")        # → ASIL B
determine_asil(2, 2, 2, "Torque oscillation < 1Nm at parking speed")   # → QM

#!/usr/bin/env python3
# FSA finding tracker: manage findings from independent safety assessor
import json
from datetime import date

findings = [
    {
        "id": "FSA-001",
        "type": "Confirmed Finding",  # blocks Safety Case closure
        "clause": "ISO26262-6:11.4.3",
        "description": "MC/DC coverage report missing for SW component EPS_Control_v2.1",
        "severity": "Major",
        "owner": "Test Engineer",
        "due_date": "2026-03-01",
        "status": "Open",
        "resolution": None
    },
    {
        "id": "FSA-002",
        "type": "Observation",
        "clause": "ISO26262-6:8.4.5",
        "description": "Freedom from Interference argument does not cover DMA transfer paths",
        "severity": "Minor",
        "owner": "SW Architect",
        "due_date": "2026-03-15",
        "status": "In Progress",
        "resolution": "Updated FFI analysis v3 in review"
    },
]

print("FSA Findings Status:")
for f in findings:
    days_remaining = (date.fromisoformat(f["due_date"]) - date.today()).days
    print(f"  [{f['id']}] {f['type']} ({f['severity']}) — {f['clause']}")
    print(f"    Status: {f['status']} | Due: {f['due_date']} ({days_remaining}d remaining)")
    print(f"    Owner: {f['owner']}")
    if f["resolution"]: print(f"    Resolution: {f['resolution']}")
    print()

major_open = [f for f in findings if f["severity"]=="Major" and f["status"]!="Closed"]
print(f"SAFETY CASE BLOCKED: {len(major_open)} Major finding(s) open.")
print("All Major findings must be Closed before Safety Case can be signed off.")