Definition
Third class refers to the third-class medical certificate issued by an FAA-designated Aviation Medical Examiner. It is the medical certification required for student pilots, recreational pilots, private pilots, and flight instructors exercising private pilot privileges. It carries the least restrictive medical standards of the three classes and is valid for 60 calendar months for pilots under age 40, and 24 calendar months for pilots age 40 and over.
Plain English
It is the basic medical certificate a person needs to fly as a student or private pilot. A doctor approved by the FAA examines you, and if you meet the health standards, you receive this certificate. It lasts five years if you're under 40 and two years if you're 40 or older.
Context Anchor
Seen when a student pilot is learning what medical certificate is needed before exercising student pilot privileges.
Derivation
The word 'class' here means a category or grade, in the same sense as 'first class' or 'economy class' on an airline ticket. The FAA uses three classes of medical certificate, ranked by how strict the health standards are. First class is the strictest (for airline transport pilots), second class covers commercial pilots, and third class covers private and student flying.
Why Pilots Care
It is the minimum medical qualification needed to begin and continue most private flying training.
Intuition Check
Do not read third class as “third-rate” or poor quality. Here, it means a specific FAA medical certificate category with its own standards and uses.
Example Sentence 1
Before her first solo, the student visited an Aviation Medical Examiner to obtain her third-class medical certificate.
Example Sentence 2
With a valid third class medical, the private pilot may fly daytime VFR but must meet the certificate’s vision and hearing standards.