In RVSM airspace, what altitude should IFR aircraft fly at from 180-359 degrees at FL290?

In Reduced Vertical Separation Minimum (RVSM) airspace, aircraft flying on IFR (Instrument Flight Rules) flight plans must adhere to specific altitude assignment rules to optimize the use of airspace while ensuring safety. For aircraft flying from 180 to 359 degrees at FL290, they are required to maintain an even altitude starting at FL300.

This is due to the RVSM environment, where aircraft are separated by 1,000 feet rather than the traditional 2,000 feet, allowing for increased capacity and more efficient use of the airspace. The rule states that aircraft should be assigned even flight levels for those on this specific track range, starting from FL300 to ensure compliance with the RVSM regulations.

The correct answer reflects this requirement, emphasizing the importance of standardized altitude assignments to maintain separation between aircraft in this designated airspace. Flying at even altitudes helps to minimize the risk of altitude encroachment or conflicts, which is critical in maintaining the safety of operations in RVSM airspace.