Plain English Meaning
The aircraft is still built the way the FAA originally approved it, and nothing about its current condition makes it unsafe to fly.
Full Definition
The condition an aircraft must meet to be legally and safely operated, requiring that it conforms to its FAA-approved type design and is in a condition for safe operation. Conformity to type design means the aircraft matches the drawings, specifications, and approved alterations on file with the FAA. Safe condition means no wear, damage, deterioration, or defect that would make the aircraft unsafe to fly.
Context Anchor
Seen in aircraft maintenance, inspection, aircraft records, and preflight airworthiness decisions.