What is the IFR altitude rule in Class G airspace below 18,000 feet MSL?
Answer
In Class G airspace below 18,000 feet MSL, IFR flights on magnetic courses of 0°–179° fly odd thousands MSL (3,000; 5,000; 7,000, etc.). Flights on magnetic courses of 180°–359° fly even thousands MSL (2,000; 4,000; 6,000, etc.).
AIM 3-3-3
Read the full regulation — AIM 3-3-3
3-3-3. IFR Requirements a. Title 14 CFR specifies the pilot and aircraft equipment requirements for IFR flight. Pilots are reminded that in addition to altitude or flight level requirements, 14 CFR section 91.177 includes a requirement to remain at least 1,000 feet (2,000 feet in designated mountainous terrain) above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown. b. IFR Altitudes. (See TBL 3-3-1.) TBL 3-3-1 IFR Altitudes Class G Airspace If your magnetic course (ground track) is: And you are below 18,000 feet MSL, fly: 0 to 179 Odd thousands MSL, (3,000; 5,000; 7,000, etc.) 180 to 359 Even thousands MSL, (2,000; 4,000; 6,000, etc.) Class G Airspace 3-3-1 2/20/25 AIM Section 4. Special Use Airspace
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