Definition
A specific subsection of Federal Aviation Regulations that lists the aircraft and operations exempt from the requirement to carry an emergency locator transmitter (ELT). It identifies categories such as turbojet aircraft, aircraft used in scheduled flights by scheduled air carriers, training operations conducted entirely within a 50 nautical mile radius of the airport from which the training began, and certain other specified operations.
Plain English
This is the part of the rules that lists which aircraft and flights do not have to carry an emergency locator beacon. Most light aircraft must carry one, but this section spells out the exceptions.
Context Anchor
Seen during preflight document checks, aircraft inspection record reviews, and discussions of required emergency equipment.
Derivation
CFR stands for Code of Federal Regulations. Part 91 covers general operating and flight rules for civil aircraft in the United States. Section 91.207 deals specifically with emergency locator transmitters, and subsection (d) is the part that lists exemptions. The numbering is a navigation tool, not a technical concept.
Why Pilots Care
A current ELT inspection ensures the beacon will activate and transmit a distress signal after an accident, greatly improving the chances of timely rescue.
Intuition Check
Do not read this as just a page number or a handbook note. It is a legal rule reference: it tells you exactly where the FAA requirement is found.
Example Sentence 1
Before training flights at the flight school, the instructor confirmed the operation fell under 14 CFR part 91, section 91.207(d), so the aircraft was not required to carry an ELT.
Example Sentence 2
The mechanic documented that the aircraft satisfied 14 CFR part 91, section 91.207(d) after testing the emergency locator transmitter's output signal.