AIM 3-3-3

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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.)
Aeronautical Information Manual (AIM) — Chapter 3 — Airspace
3-1-1 General • 3-1-2 Airspace Dimensions • 3-1-3 Airspace Hierarchy • 3-1-4 Basic VFR Weather Minimums • 3-1-5 VFR Cruising Altitudes

3-2-1 General • 3-2-2 Class A • 3-2-3 Class B • 3-2-4 Class C • 3-2-5 Class D • 3-2-6 Class E
3-3-1 General • 3-3-2 VFR Requirements • 3-3-3 IFR Requirements
3-4-1 General • 3-4-2 Prohibited Areas • 3-4-3 Restricted Areas • 3-4-4 Warning Areas • 3-4-5 MOAs • 3-4-6 Alert Areas • 3-4-7 Controlled Firing Areas
3-5-1 Airport Advisory Services • 3-5-2 MTRs • 3-5-3 TFRs • 3-5-4 Parachute Ops • 3-5-5 VFR Routes • 3-5-6 TRSAs • 3-5-7 National Security Areas