US-FAA14 CFR 91.183
IFR communications
Read the official ruleIn plain English
Under IFR in controlled airspace you must keep a continuous listening watch on the assigned frequency and report promptly: passing compulsory reporting points (only those ATC requests when you're in radar contact), any unforecast weather you encounter, and anything else affecting the safety of flight.
Key points
- Maintain a continuous watch on the appropriate frequency.
- Report passing designated reporting points (when in radar contact, only those ATC specifically requests).
- Report unforecast weather and any safety-of-flight information as soon as possible.
Common pitfalls
- Failing to make position reports when not in radar contact.
- Not reporting deteriorating weather you actually encounter.
Summary: Under IFR in controlled airspace, keep a continuous radio watch and promptly report required reporting points (non-radar), unforecast weather, and any safety-of-flight information.
This is an original plain-English explanation for training and reference, not legal advice and not for navigation. Always rely on the current official rule linked above. Last reviewed June 2, 2026.