How do I install the Ndt Method Selection skill?

Run npx skillmds@latest add ashfordeou/ndt-method-selection 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.

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Is Ndt Method Selection free to use?

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

Who published Ndt Method Selection?

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

Ndt Method Selection by ashfordeou — Agent Skill

Name: Ndt Method Selection
Author: ashfordeOU

Ndt Method Selection

Use when you must select a non-destructive testing (NDT) method for an aerospace part from its defect class and material: determine whether the defect is surface, near-surface, or internal, classify the material as ferromagnetic, non-ferromagnetic, or non-conductive, and pick among radiography (RT), ultrasonic (UT), eddy current (ET), liquid penetrant (PT), and magnetic particle (MT) by sensitivity with cost as secondary reporting. Produces the recommended method, the alternates, and the selection rationale that gate the NDT inspection planning for special processes. Trigger: non-destructive testing, ndt, radiography, ultrasonic, eddy current, penetrant, magnetic particle, defect class, ferromagnetic.

ashfordeOU 76b5a08 3 files · 12.4 KB Updated Sep 17, 2026

File contents

NDT Method Selection (manufacturing-quality/ndt/ndt-method-selection)

Use when the task is choosing a non-destructive testing method for an aerospace part: defect class (surface, near-surface, internal) and material class (ferromagnetic, non-ferromagnetic, non-conductive) drive the applicable method set, and sensitivity ranks the pick.

Domain quick reference

Methods: RT radiography, UT ultrasonic, ET eddy current, PT liquid penetrant, MT magnetic particle.
Defect classes: surface, near-surface, internal.
Material classes: ferromagnetic, non-ferromagnetic, non-conductive.
Decision table (module-level DECISION_TABLE): internal maps to RT, UT; near-surface maps to ET, UT; surface maps to MT, PT on ferromagnetic, ET, PT on non-ferromagnetic, PT on non-conductive.
Physical constraints: eddy current needs a conductive material, magnetic particle needs a ferromagnetic material, liquid penetrant needs a non-porous surface and works on all three material classes.
Sensitivity rank (5 highest): UT 5, RT 4, ET 4, MT 3, PT 3.
Cost rank (1 cheapest, reporting only): RT 4, UT 3, ET 2, MT 2, PT 1. Cost never overrides sensitivity.
Tie-break: equal sensitivity prefers the later method in the fixed order RT < UT < ET < MT < PT; the only reachable tie is MT vs PT, which picks PT (also the alphabetically-later method).
AS9100 frames NDT as a special process; NDT personnel follow common aerospace practice (level certification, written procedures, records) without reproducing clause text here.

Workflow

Classify the defect location: surface, near-surface, or internal.
Classify the material: ferromagnetic, non-ferromagnetic, or non-conductive.
Call applicable_methods(defect_class, material) for the sorted method list valid for the combination.
Rank the applicable methods with sensitivity_rank and call select_method(defect_class, material) for the top pick, the alternates, and the rationale.
Report cost_rank(method) as secondary information only; it never overrides sensitivity.
Validate inputs first: an unknown defect class or material class raises ValueError from applicable_methods and select_method.

Pitfalls

Eddy current on a non-conductive material: ET needs conductivity; on a composite use PT for surface defects.
Magnetic particle on a non-ferromagnetic part: MT needs a ferromagnetic material; use PT or ET instead.
Cost as the primary driver: cost_rank is reporting only and must not override sensitivity in the pick.
Surface defects do not get RT or UT: only PT, plus MT on ferromagnetic or ET on non-ferromagnetic material, apply.
Tie handling: MT and PT both rank 3, so surface plus ferromagnetic picks PT, not MT, per the fixed tie-break order.
Misspelled class names: an unknown class or material raises ValueError instead of silently returning an empty list.

Behavior contract (gate 3)

The selection logic is exercised by the gate 3 contract test: scripts/test_ndt_selection.py against scripts/ndt_selection_logic.py (stdlib unittest, offline). Run: python3 scripts/test_ndt_selection.py

Compliance

Standards referenced, not reproduced: AS9100 clause 8.5.1.3 frames special-process control; the method table is common NDT methodology, summary-only per standards-map.yaml.
compliance: STANDARDS-REF, gated: false.

---name: ndt-method-selectiondescription: Use when you must select a non-destructive testing (NDT) method for an aerospace part from its defect class and material: determine whether the defect is surface, near-surface, or internal, classify the material as ferromagnetic, non-ferromagnetic, or non-conductive, and pick among radiography (RT), ultrasonic (UT), eddy current (ET), liquid penetrant (PT), and magnetic particle (MT) by sensitivity with cost as secondary reporting. Produces the recommended method, the alternates, and the selection rationale that gate the NDT inspection planning for special processes. Trigger: non-destructive testing, ndt, radiography, ultrasonic, eddy current, penetrant, magnetic particle, defect class, ferromagnetic.license: Apache-2.0---# NDT Method Selection (manufacturing-quality/ndt/ndt-method-selection)Use when the task is choosing a non-destructive testing method for anaerospace part: defect class (surface, near-surface, internal) andmaterial class (ferromagnetic, non-ferromagnetic, non-conductive) drivethe applicable method set, and sensitivity ranks the pick.## Domain quick reference- Methods: RT radiography, UT ultrasonic, ET eddy current, PT liquid penetrant, MT magnetic particle.- Defect classes: surface, near-surface, internal.- Material classes: ferromagnetic, non-ferromagnetic, non-conductive.- Decision table (module-level DECISION_TABLE): internal maps to RT, UT; near-surface maps to ET, UT; surface maps to MT, PT on ferromagnetic, ET, PT on non-ferromagnetic, PT on non-conductive.- Physical constraints: eddy current needs a conductive material, magnetic particle needs a ferromagnetic material, liquid penetrant needs a non-porous surface and works on all three material classes.- Sensitivity rank (5 highest): UT 5, RT 4, ET 4, MT 3, PT 3.- Cost rank (1 cheapest, reporting only): RT 4, UT 3, ET 2, MT 2, PT 1. Cost never overrides sensitivity.- Tie-break: equal sensitivity prefers the later method in the fixed order RT < UT < ET < MT < PT; the only reachable tie is MT vs PT, which picks PT (also the alphabetically-later method).- AS9100 frames NDT as a special process; NDT personnel follow common aerospace practice (level certification, written procedures, records) without reproducing clause text here.## Workflow1. Classify the defect location: surface, near-surface, or internal.2. Classify the material: ferromagnetic, non-ferromagnetic, or non-conductive.3. Call applicable_methods(defect_class, material) for the sorted method list valid for the combination.4. Rank the applicable methods with sensitivity_rank and call select_method(defect_class, material) for the top pick, the alternates, and the rationale.5. Report cost_rank(method) as secondary information only; it never overrides sensitivity.6. Validate inputs first: an unknown defect class or material class raises ValueError from applicable_methods and select_method.## Pitfalls- Eddy current on a non-conductive material: ET needs conductivity; on a composite use PT for surface defects.- Magnetic particle on a non-ferromagnetic part: MT needs a ferromagnetic material; use PT or ET instead.- Cost as the primary driver: cost_rank is reporting only and must not override sensitivity in the pick.- Surface defects do not get RT or UT: only PT, plus MT on ferromagnetic or ET on non-ferromagnetic material, apply.- Tie handling: MT and PT both rank 3, so surface plus ferromagnetic picks PT, not MT, per the fixed tie-break order.- Misspelled class names: an unknown class or material raises ValueError instead of silently returning an empty list.## Behavior contract (gate 3)The selection logic is exercised by the gate 3 contract test:scripts/test_ndt_selection.py againstscripts/ndt_selection_logic.py (stdlib unittest, offline). Run:python3 scripts/test_ndt_selection.py## Compliance- Standards referenced, not reproduced: AS9100 clause 8.5.1.3 frames special-process control; the method table is common NDT methodology, summary-only per standards-map.yaml.- compliance: STANDARDS-REF, gated: false.

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