planninglisted

Use when planning DO-178C software certification for airborne systems or equipment: determine the software level or DAL (A-E) from failure-condition severity, draft the PSAC (Plan for Software Aspects of Certification), and scope planning-phase artifacts such as the PSAC, SDP, SVP, SCM, and SQA plans. Covers ARP4754A FDAL/IDAL allocation and ARP4761A severity-to-DAL propagation, including coverage-depth implications per level: A requires MC/DC, B requires decision coverage, C requires statement coverage, D and E require none. Trigger: DO-178C planning, PSAC, software level determination, DAL assignment, development assurance, certification planning, ARP4754A, ARP4761A, airborne software certification.
ashfordeOU/aero-agent-skills · ★ 0 · AI & Automation · score 76

Install: claude install-skill ashfordeOU/aero-agent-skills

# DO-178C Planning (avionics/do178c/planning) Use when the task is DO-178C planning-phase work: drafting a PSAC, determining the software level (DAL) for a function or item, or scoping planning-phase artifacts (PSAC, SDP, SVP, SCM, SQA plans). ## Domain quick reference - Software levels (DO-178C): A = Catastrophic, B = Hazardous, C = Major, D = Minor, E = No safety effect. - ARP4754A splits development assurance: FDAL (function) vs IDAL (item); an item's IDAL is the highest FDAL among the functions it implements. - ARP4761A propagates failure-condition severity to DAL. - Coverage depth scales with DAL: A = 100% MC/DC, B = 100% decision, C = 100% statement, D/E = none required. - Accepted means of compliance: AC 20-115D (software), AC 20-174 (ARP4754A). ## Workflow 1. Confirm certification basis and applicable standards. 2. Determine failure-condition severity per ARP4761A (FHA/PSSA inputs). 3. Allocate DAL / FDAL / IDAL per ARP4754A + ARP4761A. 4. Map DAL to DO-178C software level and objectives tables. 5. Draft PSAC and planning-phase artifacts. ## Pitfalls - DAL from severity alone without FDAL/IDAL split. - Coverage depth mismatched to level (A requires MC/DC, not statement). - Traceability gaps (no derived requirements). ## Behavior contract (gate 3) This skill ships its own contract test, like every skill in the library: scripts/test_do178c_levels.py against scripts/do178c_levels.py (stdlib unittest, offline). Run: python3 skills/avionics/do178c/planning/s