Definition
A specific paragraph of Title 14 of the Code of Federal Regulations, Part 61, Section 101, paragraph (d), which sets out the operating limitations that apply to a recreational pilot. Among other things, it prohibits a recreational pilot from operating in airspace where communication with air traffic control is required — which includes Class B airspace.
Plain English
A short paragraph in the federal aviation rules that lists what a recreational pilot is and isn't allowed to do. One of those limits is that a recreational pilot can't fly in airspace that requires talking to air traffic control, such as Class B.
Context Anchor
Seen in operating rules for Class B airspace, especially when the FAA handbook explains which pilots need extra authorization before entering.
Derivation
“Section” means a numbered part of a written rule. “61” refers to 14 CFR Part 61, the federal rules for pilot certification. “101(d)” points to one specific paragraph inside that part, so the citation tells you exactly where the rule is found.
Why Pilots Care
A recreational pilot must know this limitation before planning any flight near large airports to avoid unintentional regulatory violations.
Intuition Check
Do not read “section 61.101(d)” as a general page number or handbook section. It is a legal rule citation: Part 61, section 101, paragraph (d).
Example Sentence 1
Because of section 61.101(d), the recreational pilot had to get an endorsement before flying through Class B airspace.
Example Sentence 2
Section 61.101(d) makes it clear that recreational pilots need a different certificate to operate inside Class B airspace.