How do I install the Airworthiness skill?

Run npx skillmds@latest add ashfordeou/airworthiness in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Airworthiness safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Airworthiness?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Airworthiness free to use?

Yes. Installing skills from SkillMD is free. This skill is licensed under Apache-2.

Who published Airworthiness?

ashfordeOU (@ashfordeou) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Airworthiness by ashfordeou — Agent Skill

Name: Airworthiness
Author: ashfordeOU

Airworthiness

Use when scoping transport-category airworthiness certification: determine the certification basis (FAR-25 for FAA programs, CS-25 for EASA programs), decide whether a system needs the 25.1309 safety assessment from its failure-condition severity, select a means of compliance (analysis, test, inspection, similarity), and sequence a type-certification program from application to issue. The mapped scope is transport-category; other categories must be re-scoped. Trigger: FAR-25, CS-25, airworthiness certification, certification basis, means of compliance, type certification, 25.1309 safety assessment, transport category.

ashfordeOU ecd31d3 3 files · 7.9 KB Updated Sep 17, 2026

File contents

FAR/CS-25 Airworthiness (avionics/far-cs25/airworthiness)

Use when the task is transport-category airworthiness certification: certification basis, safety assessment applicability, means of compliance, and type-certification sequencing.

Domain quick reference

14 CFR Part 25 (FAR-25) is the US transport-category airworthiness regulation; CS-25 is the EASA certification specification for large aeroplanes and mirrors FAR-25 with EU amendments (AMC-25 acceptable means of compliance).
The certification basis names the regulation plus program-specific amendments and special conditions.
25.1309 requires the safety assessment of systems whose failure conditions are catastrophic, hazardous, or major.
Means of compliance: analysis, test (ground and flight), inspection, similarity, and certification-program demonstrations.

Workflow

Identify the airplane category and operating jurisdiction.
Determine the certification basis (regulation + amendments + special conditions) with the certification authority.
For each system, classify failure-condition severity and decide whether the 25.1309 safety assessment applies.
Agree the means of compliance per area.
Sequence the program: application, basis, means of compliance, compliance demonstration, issue.

Pitfalls

Applying FAR-25/CS-25 outside transport category (re-scope).
Skipping the safety assessment for a major-or-worse failure condition.
A means of compliance agreed without the certification authority.
Treating the basis as fixed before amendments and special conditions are negotiated.

Behavior contract (gate 3)

The certification-basis, safety-assessment, and program logic is exercised by the gate 3 contract test: scripts/test_airworthiness.py against scripts/airworthiness_logic.py (stdlib unittest, offline). Run: python3 scripts/test_airworthiness.py

Compliance

FAR-25 is US government work (17 U.S.C. 105), quotable with citation; CS-25 reproduction authorised with source acknowledged (EASA). Paraphrase preferred per standards-map.yaml.
compliance: STANDARDS-REF, gated: false.

---name: airworthinessdescription: Use when scoping transport-category airworthiness certification: determine the certification basis (FAR-25 for FAA programs, CS-25 for EASA programs), decide whether a system needs the 25.1309 safety assessment from its failure-condition severity, select a means of compliance (analysis, test, inspection, similarity), and sequence a type-certification program from application to issue. The mapped scope is transport-category; other categories must be re-scoped. Trigger: FAR-25, CS-25, airworthiness certification, certification basis, means of compliance, type certification, 25.1309 safety assessment, transport category.license: Apache-2.0---# FAR/CS-25 Airworthiness (avionics/far-cs25/airworthiness)Use when the task is transport-category airworthiness certification:certification basis, safety assessment applicability, means ofcompliance, and type-certification sequencing.## Domain quick reference- 14 CFR Part 25 (FAR-25) is the US transport-category airworthiness regulation; CS-25 is the EASA certification specification for large aeroplanes and mirrors FAR-25 with EU amendments (AMC-25 acceptable means of compliance).- The certification basis names the regulation plus program-specific amendments and special conditions.- 25.1309 requires the safety assessment of systems whose failure conditions are catastrophic, hazardous, or major.- Means of compliance: analysis, test (ground and flight), inspection, similarity, and certification-program demonstrations.## Workflow1. Identify the airplane category and operating jurisdiction.2. Determine the certification basis (regulation + amendments + special conditions) with the certification authority.3. For each system, classify failure-condition severity and decide whether the 25.1309 safety assessment applies.4. Agree the means of compliance per area.5. Sequence the program: application, basis, means of compliance, compliance demonstration, issue.## Pitfalls- Applying FAR-25/CS-25 outside transport category (re-scope).- Skipping the safety assessment for a major-or-worse failure condition.- A means of compliance agreed without the certification authority.- Treating the basis as fixed before amendments and special conditions are negotiated.## Behavior contract (gate 3)The certification-basis, safety-assessment, and program logic isexercised by the gate 3 contract test: scripts/test_airworthiness.pyagainst scripts/airworthiness_logic.py (stdlib unittest, offline).Run: python3 scripts/test_airworthiness.py## Compliance- FAR-25 is US government work (17 U.S.C. 105), quotable with citation; CS-25 reproduction authorised with source acknowledged (EASA). Paraphrase preferred per standards-map.yaml.- compliance: STANDARDS-REF, gated: false.

Frequently asked questions