Definition
The section of the Federal Aviation Regulations that establishes rules for security control of air traffic, including the requirement to file and follow a flight plan when operating in an Air Defense Identification Zone (ADIZ) and the procedures for identifying aircraft entering or operating within U.S. airspace for national defense purposes.
Plain English
The set of federal rules that tells pilots what they must do when flying near or into U.S. airspace where the military needs to identify every aircraft for security reasons.
Context Anchor
You may see 14 CFR part 99 mentioned when reading about Air Defense Identification Zones, defense areas, flight plan requirements, or special security procedures.
Derivation
CFR stands for Code of Federal Regulations -- the official collection of U.S. government rules. The number 14 identifies the aviation volume, and 'part 99' is the specific chapter within it dealing with security control of air traffic.
Why Pilots Care
Noncompliance can trigger interception by military aircraft or result in enforcement action.
Intuition Check
Do not read “part 99” as a page number or a general reference. It is a specific federal rule section that carries legal requirements for certain flights.
Example Sentence 1
Before flying from Florida to the Bahamas, the pilot reviewed 14 CFR part 99 to make sure she met the ADIZ flight plan and transponder requirements.
Example Sentence 2
Operations in security areas must follow the procedures listed in 14 CFR part 99.