Using the DME method, what is the minimum MSL altitude required to reach the high key position at an outlying field approximately 10 miles away at 100 feet elevation?

To determine the minimum MSL altitude required to reach the high key position using the Distance Measuring Equipment (DME) method, the fundamental principle involves ensuring adequate terrain clearance and a safe altitude above the field elevation.

In this scenario, the outlying field is at an elevation of 100 feet, and it is located approximately 10 miles away. The DME method indicates that the altitude should typically be set at a minimum of 1,000 feet AGL for each mile of distance from the runway, along with the field elevation accounted for.

Given that the field is at 100 feet, if we assess a distance of 10 miles, we need to calculate the altitude as follows:

1. For 10 miles, the altitude should ideally be 10,000 feet AGL.

2. Adding the field elevation of 100 feet means you would need to be at 10,100 feet MSL to ensure safety while maneuvering in the pattern.

However, high key positions may not always adhere strictly to this minimum requirement, often allowing for a buffer. The most closely aligned number that ensures both terrain clearance and practical operation while maintaining safety margins provides us with the answer of 8,100 feet MSL.

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