Definition
A specific paragraph within Title 14 of the Code of Federal Regulations, Part 91, Section 203, paragraph (b), which requires that the airworthiness certificate be displayed in the aircraft at the cabin or cockpit entrance so that it is legible to passengers or crew.
Plain English
A federal aviation rule that says the aircraft's airworthiness certificate must be posted somewhere visible near the cabin or cockpit entrance so anyone boarding can read it.
Context Anchor
You may see section 91.203(b) when studying the required documents that must be on board and properly displayed before an aircraft is operated.
Derivation
The numbering system follows federal regulation format: Title (14 CFR) -- Part (91) -- Section (.203) -- paragraph (b). Part 91 covers General Operating and Flight Rules, and Section 91.203 specifically addresses civil aircraft certifications required to be on board. Knowing the structure helps pilots quickly find and cite specific rules.
Why Pilots Care
Failure to display the certificate properly can result in the aircraft being grounded or the pilot facing enforcement action.
Intuition Check
Do not read section 91.203(b) as a physical section of the airplane. Here, section means a specific numbered paragraph in the FAA rules.
Example Sentence 1
During the preflight check, the student verified that the airworthiness certificate was displayed at the cabin entrance as required by section 91.203(b).
Example Sentence 2
The inspector checked for compliance with section 91.203(b) during the ramp inspection.