What altitudes should you use when operation VFR in level cruising flight at more than 3000 ft AGL and what determines those altitudes?
The Correct Answer and Explanation is:
When operating under Visual Flight Rules (VFR) in level cruising flight at altitudes greater than 3,000 feet above ground level (AGL), pilots should adhere to the following altitude requirements based on the direction of flight:
- Eastbound Flights (heading 0° to 179°): Fly at odd thousand-foot altitudes plus 500 feet (e.g., 3,500 ft, 5,500 ft, 7,500 ft, etc.).
- Westbound Flights (heading 180° to 359°): Fly at even thousand-foot altitudes plus 500 feet (e.g., 4,500 ft, 6,500 ft, 8,500 ft, etc.).
These altitude rules are determined by the Federal Aviation Administration (FAA) and are designed to provide safe vertical separation between aircraft flying in opposite directions. This system of altitude assignment is known as the VFR cruising altitude rule and is part of the general VFR flight planning guidelines outlined in the 14 CFR 91.159 regulations.
Explanation:
The VFR cruising altitude rules help prevent mid-air collisions by ensuring that aircraft flying in opposite directions are separated vertically. This is especially important at higher altitudes where there may be multiple VFR flights in the same airspace. The “odd” and “even” altitude assignments are based on the aircraft’s magnetic course:
- Aircraft flying eastward (heading between 0° and 179°) are assigned odd altitudes (e.g., 3,500 ft, 5,500 ft) to maintain sufficient separation from aircraft flying in the opposite direction.
- Aircraft flying westward (heading between 180° and 359°) are assigned even altitudes (e.g., 4,500 ft, 6,500 ft) to ensure the same separation.
These rules are meant for level cruising flights above 3,000 feet AGL, primarily in uncontrolled airspace or when flying in airspace that doesn’t require specific IFR (Instrument Flight Rules) clearances. It is important to note that these rules do not apply when flying below 3,000 feet AGL, in which case pilots should follow different guidelines based on local airspace and traffic considerations.