Definition
The approved design of an aircraft type, including the drawings, specifications, dimensions, materials, processes, airworthiness limitations, and any other data needed to define the aircraft's configuration and characteristics for compliance with applicable airworthiness standards. The type design is the technical baseline approved by the FAA when a Type Certificate is issued.
Plain English
Type design is the official, FAA-approved blueprint of an aircraft model. It describes exactly how that model must be built and configured to be considered airworthy.
Context Anchor
Seen in FAA certification discussions, especially when the handbook explains how the FAA approves aircraft designs and later determines whether an aircraft is airworthy.
Derivation
"Type" here means a specific model or class of aircraft (e.g., Cessna 172S). "Design" means the documented plan for building it. Together, type design means the approved design that defines a particular aircraft model.
Why Pilots Care
An aircraft must conform to its approved type design to keep its airworthiness certificate valid; unauthorized changes can ground the airplane.
Intuition Check
Do not read type design as just the general style or appearance of an airplane. In FAA use, it means the exact approved design record that defines a specific aircraft model.
Example Sentence 1
When the mechanic installed the new avionics, he confirmed the change was approved under an STC so the aircraft still conformed to its type design.
Example Sentence 2
Any deviation from the type design requires FAA review and possible supplemental type certificate approval.