Definition
The use of computer software to create, modify, analyze, and document engineering drawings and three-dimensional models of parts, assemblies, and structures. In aviation, CAD is used to design airframes, engines, components, and systems with high precision, allowing engineers to test fit, strength, and performance before any physical part is built.
Plain English
Designing aircraft parts and structures on a computer instead of on a paper drawing board. The computer lets engineers draw, change, and check the design quickly and accurately.
Context Anchor
Seen in aircraft design, manufacturing, modification, and maintenance documentation.
Derivation
Straight from the words themselves: 'computer-aided' meaning the computer assists the work, and 'design' meaning the planning and drawing of something to be built. The phrase came into common use in the 1960s as engineering moved off the drafting table and onto the screen.
Why Pilots Care
Most modern aircraft, avionics, and replacement parts are designed and documented in CAD. When a mechanic pulls up a parts diagram or a manufacturer issues a service bulletin with detailed drawings, those drawings almost always come from a CAD system.
Intuition Check
Computer-aided does not mean the computer makes all the design decisions. It means the computer helps people draw, measure, model, and check the design more accurately.
Example Sentence 1
The new wingtip fairing was developed using Computer-Aided Design, allowing engineers to refine its shape before any tooling was built.
Example Sentence 2
Engineers updated the landing-gear strut using computer-aided design before releasing the revised drawing package.