Definition
A specific subsection of the federal aviation regulations that allows a recreational pilot to fly within Class B airspace, or to/from an airport located within Class B airspace, only if they have received ground and flight training from an authorized instructor on that airspace and a logbook endorsement certifying their proficiency to do so.
Plain English
This is the rule that says a recreational pilot is not normally allowed near busy big-city airspace unless an instructor has trained them for it and signed their logbook to prove they are competent.
Context Anchor
Seen in FAA handbook discussions of Class B airspace and the limits that apply to student, sport, and recreational pilots.
Derivation
The citation breaks down as: '14 CFR' is Title 14 of the Code of Federal Regulations (the part of U.S. federal law covering aeronautics and space); 'part 61' covers the certification of pilots and instructors; 'section 61.101' covers recreational pilot privileges and limitations; '(d)' is the specific paragraph dealing with operations in Class B airspace. Knowing how the citation is built makes it easier to find the rule and others like it.
Why Pilots Care
Violating this rule can lead to enforcement action and immediately restricts where a recreational pilot may fly.
Intuition Check
Do not read this as a flying maneuver or checklist step. It is a legal address: it tells you exactly where to find the rule that applies.
Example Sentence 1
Before flying into the Class B airspace around the major city, the recreational pilot completed the training and received the 14 CFR part 61, section 61.101(d) endorsement from her instructor.
Example Sentence 2
The instructor explained that 14 CFR part 61, section 61.101(d) prevents entry into Class B without meeting the listed requirements.