During a descent from 10,000 feet after crossing the SIDON VORTAC, what should the descent gradient be?

The appropriate descent gradient after crossing the SIDON VORTAC during a descent from an altitude of 10,000 feet is typically between 800 to 1,000 feet per nautical mile. This gradient ensures that the aircraft can descend safely and efficiently while maintaining a comfortable rate for passengers and adhering to regulatory and operational requirements.

When planning a descent, various factors such as airspeed, aircraft performance, and current weather conditions need to be considered. The selected gradient allows for a balance between a controlled descent rate and the need to reach lower altitudes in a timely manner. Too steep of a descent can lead to excessive speeds and potential issues with pressure changes in the aircraft, while too shallow of a descent might result in the need for extended flight time and increased fuel consumption.

In contrast, the other gradient options do not align with standard operational practices under normal conditions or may represent descents that could compromise safety or efficiency. The 800-1,000 feet per nautical mile range provides a commonly accepted guideline that ensures safe vertical navigation while descending through controlled airspace.