Definition
A range of parts within Title 14 of the Code of Federal Regulations (CFR), the section of U.S. federal law that governs aeronautics and space. Parts 175 through 225 contain regulations covering a mix of subjects including the carriage of hazardous materials by air, certification of airmen and aircraft, operating rules for various types of flight operations, and airport-related requirements.
Plain English
A block of aviation rules in the U.S. federal law book. Each numbered 'part' is a separate set of rules covering a specific topic, and parts 175 to 225 cover a wide range of aviation subjects.
Context Anchor
Seen in FAA handbooks and regulatory discussions when the text points to where certain aviation rules are found in the federal regulations.
Derivation
CFR stands for Code of Federal Regulations, the official collection of rules issued by U.S. government agencies. Title 14 is the volume covering 'Aeronautics and Space.' Within Title 14, the rules are divided into numbered parts, each covering a specific topic. 'Parts 175-225' simply means part numbers 175 through 225 in that volume.
Why Pilots Care
Aircraft must comply with these regulations to receive and maintain a valid airworthiness certificate required for legal flight.
Intuition Check
Do not read “parts” as aircraft parts here. In 14 CFR parts 175-225, “parts” means numbered divisions of federal regulations.
Example Sentence 1
The instructor pointed out that the rules governing the topic were spread across 14 CFR parts 175-225, so the student would need to look up the specific part that applied.
Example Sentence 2
Before buying a used aircraft, the buyer reviewed the applicable requirements from 14 CFR parts 175-225 to confirm it remained airworthy.