Definition
The section of Title 14 of the Code of Federal Regulations that specifies the radio communication reports a pilot operating under IFR in controlled airspace must make to ATC. It requires reporting the time and altitude of passing each designated reporting point (or those requested by ATC), any unforecast weather conditions, and any other information relating to the safety of flight.
Plain English
This is the rule that tells IFR pilots what they must report to ATC by radio while flying — things like reaching reporting points, unexpected weather, and anything else affecting flight safety.
Context Anchor
Seen in instrument training, IFR flight planning, and communication-failure discussions when deciding what reports and radio monitoring are normally required before a radio problem occurs.
Derivation
14 CFR means Title 14 of the Code of Federal Regulations, the part of U.S. federal law covering aeronautics and space. Part 91 contains the general operating rules for all civil aircraft. The number after the decimal (.183) identifies the specific section within that part.
Why Pilots Care
Following these procedures keeps the aircraft separated from other traffic and allows the flight to continue safely to its destination.
Intuition Check
Do not read this as just a page reference. It is a specific federal rule that tells pilots what they must do during IFR communication in controlled airspace.
Example Sentence 1
Per 14 CFR 91.183, the pilot reported crossing the BRAVO intersection at 8,000 feet to Center.
Example Sentence 2
When communications were lost, the crew complied with 14 CFR Part 91.183 by maintaining altitude and proceeding to the destination airport.